GE AM-2.4/4.16-100/150- 3 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

3

Inhaltsverzeichnis

Andere GE Schutzschalter Handbücher

GE

GE MicroVersaTrip AKR-75 Bedienungsanleitung

GE

GE AK-1-15 Series Betriebsanleitung

GE

GE PowerVac Bedienungsanleitung

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GE Spectra Series AMC3FGB Bedienungsanleitung

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GE AKR-5-100 Bedienungsanleitung

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GE

GE AKR-30 Series Bedienungsanleitung

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GE FE 160 Bedienungsanleitung

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GE ReliaGear Pro-Stock Spectra RMS Bedienungsanleitung

GE

GE FK800 Bedienungsanleitung

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GE EntelliGuard GT-H Bedienungsanleitung

GE

GE AKR-75 Series Programmierhandbuch

GE

GE SecoVac Series Bedienungsanleitung

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GE AM-4.16-250-6 Bedienungsanleitung

GE

GE AK-4-75 Bedienungsanleitung

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GE Pro-Stock SF250 Bedienungsanleitung

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GE GL 310 F1/4031 P/VR Bedienungsanleitung

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GE MicroVersaTripPlus AK-50 Bedienungsanleitung

GE

GE GL 310 F3/4031 P/VR Bedienungsanleitung

GE

GE M-Pact Plus Bedienungsanleitung

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Gewiss 90 RCD Bedienungsanleitung

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ABB SACE Emax E1 Bedienungsanleitung

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WEG FHU ACW125 Bedienungsanleitung

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Eaton S-T0 Handbuch

GEH

-

2000

B

INSTRUCTIONS

AND

RENEWAL

PARTS

(

SUP

ERSEDE

9

SEH

-

2000

A

)

v

.

s

Types

AM

-

2.4

/

4.16

-

100

/

150

-

3

AM

-

2.4

/

4.16

-

100

/

150

A

-

3

AM

-

2.4

/

4.16

-

150

/

250

-

3

AM

-

2.4

/

4.16

-

150

/

250

A

-

3

IVlth

MS

-

13

Mechanism

eOECTSHTS

3

INTRODUCTION

RECEIVING

,

HANDLING

AND

STORAGE

3

.

.

.

3

DESCRIPTION

.

.

.

4

INSTALLATION

.

..

.

.

9

OPERATION

.

.

11

MAINTENANCE

..

..

•

•

..

18

RENEWAL

PARTS

.

.

.

• •

MEDIUM

VOLTAGE

SWITCHGEAR

DEPARTMENT

wm

L

GENERAL

PHILADELPHIA

,

P A

.

Courtesy of NationalSwitchgear.com

%

GEH

-

2000

Circuit

Breaker

Type

AM

T

1

*

A

1

C

I

i

,

4

in

CM

r

-

o

CM

o

CO

W

&

MM

cn

u

_

LJCGT

;

1

.

Secondary

Coupler

J

2

.

Auxiliary

Switch

3

.

Position

Indicator

4

.

Opening

Spring

Unit

5

.

Operation

Counter

6

.

Manual

Trip

'

#

7

.

Control

Device

8

.

Control

Device

Plunger

Guide

9

.

Closing

Solenoid

10

.

Plunger

Interlock

(

Optional

)

:

J

_

4

>

£

v

/

.

-

_

ni

V

smsamiai

rSi

—

itw

j

»

»

-

,

7

~

^

.

/

S

’

’

,

y

S

A

A

;

-

:

rl

“

'

fL

t

A

_

8

WK

r

,

;

i

:

-

rh

j

.

'

"

;

-

;

--

'

*

1

/

-

•

V

-

i

o

f

-

-

»

T

?

-

*

7

~

;

I

|

;

•

i

i

i

t

_

i

-

Fig

.

I

MS

-

13

Operating

Mechanise

wrmw

*

B

:

v

-

-

f

‘

ML

.

-

-

s

:

a

IMi

mmm

00

00

s

:

-

-

r

-

8

;

-

A

-

f

’

.

'

J

=

s

'

l

-

Si

f

.

CM

C

?

i

V

'

&

LS

-

!

mm

L

.

•

•

vV

-

•

.

v

3

ST

w

rtiL

«

«

:

»

J

'

3

XH

-

<

-

12

.

-

Y

5

#

/

CC

S

>

‘

v

-

;

^

O

2

CM

CM

if

§

4

®

>

3

3

.

Handle

4

.

Release

Valve

1

.

Closing

Armature

2

.

Maintenance

Operating

Device

Method

of

Mounting

Maintenance

Operating

Device

Fig

.

2

2

Courtesy of NationalSwitchgear.com

MAGNE

-

BLAST

CIRCUIT

BREAKER

TYPE

AM

-

2.4

/

4.16

WITH

MS

-

13

MECHANISM

c

INTRODUCTION

interrupted

in

air

by

sufficiently

elongating

and

cooling

it

.

This

is

accomplished

by

means

of

a

strong

magnetic

field

that

lengthens

the

arc

and

forces

it

into

in

-

timate

contact

with

cool

dielectric

mater

-

given

on

the

nameplate

.

Since

this

book

is

written

to

cover

several

ratings

of

breakers

that

are

of

the

same

general

design

,

all

instructions

will

be

of

a

gen

-

eral

character

and

all

illustrations

will

be

typical

,

unless

otherwise

specified

.

The

Magne

-

blast

Circuit

Breaker

is

the

removable

interrupting

element

for

use

in

vertical

-

lift

metal

-

clad

switchgear

,

to

pro

-

vide

reliable

control

and

protection

of

power

systems

.

Among

the

many

advantages

of

metal

-

clad

switchgear

are

added

protection

to

equipment

and

personnel

,

compactness

,

simplified

installation

and

reduced

mainte

-

nance

.

In

keeping

with

these

features

the

Magne

-

blast

breakers

are

designed

for

in

-

terchangeability

and

manueverability

,

to

-

gether

with

reliability

and

low

maintenance

requirements

.

The

Magne

-

blast

Circuit

Breaker

oper

-

ates

on

the

principle

that

an

arc

can

be

ial

.

v

The

AM

-

2.4

/

4.16

Magne

-

blast

Break

-

er

is

available

in

a

number

of

current

and

voltage

ratings

.

Refer

to

the

breaker

nameplate

for

the

complete

rating

inform

-

ation

of

any

particular

breaker

.

The

short

circuit

conditions

to

be

imposed

on

the

breaker

must

not

exceed

its

rating

,

nor

should

it

be

called

upon

to

operate

at

voltages

or

currents

greater

than

those

PROPER

INSTALLATION

AND

MAIN

-

TENANCE

ARE

NECESSARY

TO

INSURE

CONTINUED

SATISFACTORY

OPERATION

OF

THE

BREAKER

.

The

following

instruc

-

tions

will

provide

complete

infomation

for

placing

the

magne

-

blast

breaker

in

ser

-

vice

and

for

maintaining

satisfactory

operation

.

RECEIVING

,

HANDLING

AND

STORAGE

Loose

parts

associated

of

the

breaker

,

with

the

breaker

are

always

included

in

the

same

crate

.

Check

all

parts

against

the

packing

list

to

be

sure

that

no

parts

have

been

overlooked

.

heaters

are

in

operation

to

prevent

condensation

.

2

.

The

breaker

should

be

stored

in

a

clean

location

,

free

from

corrosive

gases

or

fumes

;

particular

care

should

be

taken

to

protect

the

equipment

from

moisture

and

cement

dust

,

as

this

com

-

bination

has

a

very

corrosive

effect

on

many

parts

.

3

.

Machined

parts

of

the

operating

mech

-

anism

,

etc

.

,

should

be

coated

with

a

heavy

oil

or

grease

to

prevent

rusting

.

If

the

breaker

is

stored

for

any

length

of

time

,

it

should

be

inspected

periodically

to

see

that

rusting

has

not

started

and

to

insure

good

mechanical

condition

.

Should

the

breaker

be

stored

under

unfavorable

atmospheric

conditions

,

steps

should

be

taken

to

dry

out

the

breaker

before

it

is

placed

in

service

.

RECEIVING

AND

HANDLING

Each

breaker

is

carefully

inspected

and

packed

by

workmen

experienced

in

the

nroper

handling

and

packing

of

electrical

quipment

.

Immediately

upon

receipt

of

the

circuit

breaker

,

an

examination

should

be

made

for

any

damage

sustained

in

tran

-

sit

.

If

injury

or

rough

handling

is

evident

,

a

damage

claim

should

be

filed

immediately

with

the

transportation

company

and

the

nearest

General

Electric

Sales

Office

should

be

notified

.

STORAGE

It

is

recommended

that

the

breaker

be

put

into

service

immediately

in

its

per

-

manent

location

.

If

this

is

not

possible

,

the

following

precautions

must

be

taken

to

insure

the

proper

storage

of

the

breaker

:

1

.

The

breaker

should

be

carefully

pro

-

tected

against

condensation

,

preferably

by

storing

it

in

a

warm

dry

room

,

since

water

absorption

has

an

adverse

effect

on

the

insulation

parts

.

Circuit

break

-

ers

for

outdoor

metal

-

clad

switchgear

should

be

stored

in

the

equipment

only

when

power

is

available

and

the

It

is

expected

that

due

care

will

be

exer

-

cised

during

the

unpacking

and

installation

of

the

breaker

so

that

no

damage

will

occur

from

careless

or

rough

handling

,

or

from

exposure

to

moisture

or

dirt

A

nail

puller

should

be

used

to

open

the

crates

,

and

care

should

be

exercised

to

prevent

tools

from

striking

either

the

crate

or

any

part

DESCRIPTION

give

high

speed

closing

and

opening

.

The

closing

operation

is

controlled

by

the

control

device

(

7

)

.

The

control

device

also

per

-

mits

trip

free

operation

(

tripping

the

break

-

er

at

any

time

during

the

closing

operation

)

.

prevents

solenoid

pumping

(

reclosing

)

after

a

trip

free

operation

.

For

AC

closing

operation

,

rectifiers

mounted

elsewhere

in

the

metal

-

clad

unit

are

used

to

supply

the

direct

current

on

which

the

closing

coil

operates

.

The

breaker

can

be

opened

elec

-

trically

,

by

remote

control

,

or

manually

,

by

means

of

the

manual

trip

device

(

6

)

.

All

secondary

connections

from

the

breaker

to

the

metal

-

clad

unit

are

made

through

the

coupler

(

1

)

.

The

magne

-

blast

breaker

is

composed

of

two

major

parts

,

the

breaker

element

and

the

operating

mechanism

.

The

breaker

element

comprises

three

similar

pole

units

,

each

pole

unit

consisting

of

main

and

arc

-

ing

contacts

,

an

interrupter

,

and

an

enclos

-

ing

box

barrier

that

segregates

the

inter

-

rupting

units

from

each

other

to

provide

insulation

between

phases

as

well

as

from

each

phase

to

ground

.

The

primary

con

-

nections

to

the

associated

metal

-

clad

equipment

are

made

through

the

primary

disconnect

studs

.

The

MS

-

13

operating

mechanism

shown

in

Fig

.

1

is

of

the

solenoid

type

designed

to

A

positive

interlock

and

interlock

switch

are

provided

between

the

breaker

and

metal

-

clad

unit

to

prevent

the

raising

or

lowering

of

the

breaker

in

the

unit

while

in

the

closed

position

and

to

prevent

a

closing

operation

when

the

breaker

is

not

in

either

the

fully

raised

or

lowered

position

.

A

plunger

type

interlock

can

also

be

provided

to

prevent

the

closing

of

two

adjacent

breakers

at

the

same

time

or

to

operate

an

additional

auxiliary

switch

mounted

in

the

metal

-

clad

unit

.

and

The

operating

mechanism

used

on

those

breakers

designed

for

MI

-

6

metal

-

clad

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

to

provide

for

every

possible

contingency

to

be

met

in

connection

with

installation

,

operation

or

maintenance

.

Should

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

'

s

purposes

,

the

matter

should

be

referred

to

the

General

Electric

Company

.

3

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

equipment

differs

somewhat

from

those

de

-

signed

for

M

-

26

equipment

but

its

operation

principally

the

same

.

This

mechanism

is

ntrolled

by

a

relay

scheme

mounted

in

the

metal

-

clad

unit

and

a

cut

-

off

switch

located

on

the

breaker

instead

of

the

control

device

.

Two

seven

terminal

secondary

couplers

also

replace

the

one

sixteen

terminal

coup

-

ler

.

The

positive

interlock

between

the

breaker

and

metal

-

clad

unit

is

replaced

with

a

trip

interlock

that

trips

the

mech

-

anism

before

raising

or

lowering

of

the

breaker

can

be

accomplished

.

A

fork

-

type

lever

can

be

furnished

to

operate

an

aux

-

iliary

switch

mounted

in

the

metal

-

clad

unit

.

For

detailed

explanation

of

the

opera

-

tion

of

the

breaker

and

mechanism

refer

to

the

section

OPERATION

.

I

5

A

i

V

+

O

"

.

1

MiN

16

16

22

S I

3

3

\

>

\

/

4

4

\

5

5

6

6

cc

ac

(

O

CJ

CC

to

eg

1

.

Stationary

pritnary

Contacts

2

.

Movable

Primary

Contacts

3

.

Buffer

Block

4

.

Stationary

Arcing

Contacts

Fig

.

3

Contact

Adjustaents

5

.

Movable

Arcing

Contacts

6

.

Upper

Arc

Runner

eo

oi

LL

.

INSTALLATION

The

following

instructions

explain

the

necessary

steps

to

be

taken

before

the

breaker

is

placed

in

the

metal

-

clad

unit

.

'

"

Ms

includes

a

complete

check

of

all

of

breaker

adjustments

,

in

addition

to

uiorough

inspection

.

For

final

installa

-

tion

instructions

refer

to

any

issue

of

the

Metal

-

clad

Switchgear

Instruction

Book

,

GEH

-

1802

.

Reference

should

also

be

made

to

the

connection

diagram

that

is

furnished

with

each

unit

.

upper

arc

runner

(

6

)

without

touching

.

All

adjustments

should

be

checked

not

only

during

the

initial

installation

of

the

breaker

but

also

during

periodic

inspec

-

V

PRIMARY

CONTACT

GAP

tioas

and

whenever

it

becomes

necessary

to

repair

or

replace

parts

that

have

become

worn

or

defective

while

in

service

.

The

following

adjustments

are

listed

in

the

order

in

which

they

are

to

be

checked

.

First

,

however

,

remove

the

breaker

from

the

metal

-

clad

unit

and

remove

the

box

barrier

and

the

mechanism

cover

.

Refer

to

Fig

.

4

.

With

the

breaker

closed

,

press

the

manual

trip

button

allowing

the

breaker

to

trip

open

normally

.

Do

not

force

the

contacts

open

wider

by

hand

.

The

gap

between

the

stationary

primary

contacts

(

5

)

and

the

movable

primary

contact

(

6

)

should

be

3

-

13

/

16

"

+

1

/

8

"

-

3

/

16

"

.

To

change

this

gap

,

loosen

the

check

nut

(

25

)

,

Fig

.

5

,

and

turn

the

adjusting

nut

(

26

)

on

stud

(

9

)

.

Screwing

the

adjusting

nut

down

will

decrease

the

primary

contact

gap

.

Tighten

the

check

nut

and

remeasure

the

contact

gap

(

close

and

trip

the

breaker

before

checking

the

measurement

)

.

\

PRIMARY

CONTACT

WIPE

DO

NOT

WORK

ON

EITHER

THE

BREAKER

OR

THE

MECHANISM

WHILE

IN

THE

CLOSED

POSITION

UNLESS

THE

PROP

AND

TRIP

LATCH

HAVE

BEEN

SECURELY

WIRED

OR

BLOCKED

TO

PRE

-

VENT

ACCIDENTAL

TRIPPING

.

When

the

breaker

Is

closed

,

as

shown

in

Fig

.

3

,

the

stationary

primary

contacts

(

1

)

.

should

rise

5

/

16

"

+

0

-

l

/

l

6

"

.

To

obtain

this

adjustment

,

open

the

breaker

and

,

referring

to

Fig

.

4

,

loosen

the

check

-

TRm

T

ATPH

U

/

TDI

?

nut

(

4

)

and

turn

the

adjusting

nut

(

3

)

.

DA

1

L

WIPE

Screwing

up

on

the

adjusting

nut

will

de

-

Refer

to

Fig

.

5

.

The

wipe

of

the

trip

crease

the

primary

contact

wipe

,

down

will

latch

(

4

)

on

the

trip

roller

(

6

)

should

be

from

increase

it

.

Tighten

the

check

nut

,

close

3

/

16

"

to

1

/

4

"

.

This

can

be

measured

by

the

breaker

and

recheck

the

wipe

.

With

putting

a

film

of

grease

on

the

latch

(

4

)

,

the

primary

contact

wipe

correctly

ad

-

closing

the

breaker

part

way

,

and

trip

-

justed

.

the

clearance

between

the

contact

ping

.

The

mechanism

has

the

proper

trip

(

7

)

and

the

buffer

block

should

be

latch

wipe

when

the

latch

rests

against

the

1

/

16

"

or

greater

(

as

shown

in

Fig

.

3

)

stop

pin

(

5

)

.

No

adjustment

is

provided

and

when

the

breaker

is

fully

closed

.

a

visual

inspection

is

usually

all

that

is

required

.

If

this

setting

is

not

correct

,

look

for

insufficient

travel

of

the

trip

shaft

(

3

)

.

ADJUSTMENTS

Although

the

breaker

has

been

com

-

pletely

adjusted

and

tested

at

the

factory

,

it

is

possible

that

unusually

rough

handling

during

transportation

may

have

caused

some

loosening

or

disturbance

of

parts

of

the

apparatus

.

It

is

therefore

advisable

to

review

all

adjustments

before

placing

the

breaker

in

service

,

making

readjustments

wherever

necessary

.

arm

ARCING

CONTACT

WIPE

Refer

to

Fig

.

3

.

Close

the

breaker

until

the

arcing

contacts

just

touch

.

This

can

be

determined

with

the

use

of

a

circuit

ISM

IN

THE

CLOSED

POSITION

,

KEEP

continuity

tester

such

as

a

light

indication

FINGERS

CLEAR

OF

THE

LINKAGE

,

AS

or

bell

set

In

this

position

,

the

gap

between

ACCIDENTAL

TRIPPING

CAN

CAUSE

SE

-

the

stationary

primary

contacts

(

1

)

and

the

VERE

INJURY

,

movable

primary

contact

(

2

)

should

be

5

/

16

”

or

greater

.

This

setting

has

been

PROP

CLEARANCE

made

in

the

factory

and

no

adjustment

is

provided

.

A

wipe

of

less

than

5

/

16

"

is

usually

an

indication

that

the

arcing

con

-

closed

as

far

as

possible

with

the

mainte

-

tacts

need

to

be

replaced

.

When

making

nance

device

,

the

clearance

between

the

this

check

,

also

see

that

the

movable

arcing

closing

pin

(

10

)

and

the

prop

(

15

)

should

contact

(

5

)

passes

through

the

slot

in

the

be

l

/

32

"

to

3

/

32

"

.

Measure

the

prop

A

maintenance

operating

device

is

pro

-

vided

for

operation

of

the

breaker

during

these

adjustment

checks

.

Mount

the

device

as

shown

in

Fig

.

2

,

and

turn

the

release

valve

(

4

)

firmly

to

the

right

.

To

close

the

breaker

,

operate

the

handle

(

3

)

with

a

pump

-

ing

motion

.

By

turning

the

release

valve

(

4

)

to

the

left

,

the

closing

armature

will

return

to

its

normal

position

.

Electrical

operation

must

not

be

attempted

until

the

breaker

has

been

operated

manually

through

complete

stroke

several

times

and

1

installation

inspection

has

been

com

-

WHEN

WORKING

ON

THE

MECHAN

-

Refer

to

Fig

.

5

.

With

the

breaker

pieced

.

4

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Bre

Type

AM

GEH

-

2000

clearance

with

a

feeler

gage

to

determine

whether

or

not

an

adjustment

should

be

ade

,

and

if

so

,

exactly

how

much

adjust

-

ent

will

be

required

.

To

make

the

ad

-

justment

,

it

will

first

be

necessary

to

open

the

breaker

and

remove

the

maintenance

operating

device

.

Remove

the

stop

nuts

(

22

and

24

)

being

careful

not

to

drop

the

armature

(

21

)

.

Lower

the

armature

from

the

mechanism

and

remove

the

two

set

screws

(

19

)

.

Remove

the

closing

plunger

(

17

)

from

the

armature

and

add

or

subtract

the

necessary

thickness

of

shims

(

20

)

to

give

the

required

adjustment

,

then

replace

the

closing

plunger

,

screwing

it

down

against

the

shims

.

Using

a

small

drill

,

spot

the

closing

plunger

through

the

set

screw

hole

.

Replace

the

set

screws

.

To

remount

the

armature

on

the

breaker

,

compress

the

piston

ring

(

18

)

.

After

reassembly

,

re

-

mount

the

maintenance

closing

device

and

check

the

adjustment

.

CLOSING

PLUNGER

CLEARANCE

Refer

to

Fig

.

5

.

With

the

breaker

in

the

open

position

,

the

clearance

between

the

closing

plunger

roller

(

14

)

should

be

obtain

this

clearance

,

the

nuts

(

22

)

two

armature

guide

bolts

(

23

)

n

raised

or

lowered

.

Both

nuts

should

be

moved

the

same

amount

.

After

making

an

adjustment

,

close

and

open

the

breaker

and

recheck

the

plunger

clearance

.

Repeat

the

adjustment

if

necessary

.

\

o

2

00

‘

175

i

and

the

closing

16

"

to

3

/

16

"

.

To

i

on

the

may

be

o

QO

1

.

Operating

Rod

2

.

Operating

Rod

Pin

3

.

Adjusting

Nut

4

.

Check

Nut

5

.

Stationary

Primary

Contacts

6

.

Movable

Primary

Contacts

7

.

Contact

Ana

8

.

Yoke

=

t

ct

u

.

Adjustable

Coupling

for

Making

Primary

Contact

Wipe

Adjustment

Fig

.

4

1

.

Main

Oper

.

Shaft

2

.

llain

Crank

3

.

Trip

Shaft

4

.

Trip

Latch

5

.

Trip

Latch

Stop

6

.

Trip

Roller

7

.

Position

Indicator

8

.

Clevis

9

.

Adjustable

Stud

10

.

Closing

Pin

11

.

Opening

Spring

Housing

12

.

Opening

Spring

,

Inner

13

.

Opening

Spring

,

Outer

14

.

Closing

Roller

15

.

Prop

16

.

Closing

Coil

17

.

Closing

Plunger

18

.

Piston

Ring

19

.

Set

Screw

20

.

Shims

21

.

Closing

Armature

22

.

Stop

Nuts

23

.

Armature

Guide

Bolts

24

.

Stop

Nuts

25

.

Check

Nut

26

.

Adjusting

Nut

co

s

2

04

5

to

6

u

.

To

20

Y

/

/

//

/

/

/

/

/

A

/

/

//

//

//

A

21

22

23

24

Fig

.

5

Cross

Section

of

MS

-

13

Meehan

iso

5

.

t

Courtesy of NationalSwitchgear.com

<

I

2

3

I

4

5

^

1

.

Back

Auxiliary

Switch

2

.

Mounting

Screw

^

3

.

Top

Auxiliary

Switch

4

.

Plunger

5

.

Operating

Arm

6

.

Trip

Lever

7

.

Plunger

Guide

6

J

|

8

1

.

Interlock

Shaft

2

.

Latch

Check

Switch

Am

*

^

-

3

.

Latch

Checking

Switch

4

.

Trip

Shaft

5

.

Interlock

Switch

Am

v

.

6

.

Interlock

Switch

Control

Device

*

in

as

far

as

possible

.

In

this

position

the

clearance

between

the

switch

plunger

(

2

)

and

the

adjustment

screw

(

3

)

should

be

not

more

than

1

/

32

”

.

If

adjustment

is

neces

-

sary

,

add

or

remove

washers

(

4

)

as

re

-

quired

.

AUXILIARY

DEVICES

Plunger

Interlock

(

AM

-

2.4

/

4.16

-

100

/

150

-

3

and

150

/

250

-

3

)

Fig

.

6

Interlock

Switch

and

Latch

Checking

Switch

Refer

to

Fig

.

9

.

With

the

breaker

in

the

open

position

,

the

vertical

distance

"

A

"

from

the

top

of

the

interlock

bolt

(

2

)

to

the

bottom

of

the

elevating

bar

(

13

)

should

be

15

-

19

/

32

"

±

1

/

16

"

.

To

change

this

ad

-

justment

add

or

remove

washers

(

3

)

.

INTERLOCK

SWITCH

WIPE

Referring

to

Fig

.

6

,

rotate

the

interlock

shaft

(

1

)

manually

clockwise

to

release

the

interlock

switch

arm

(

3

)

.

The

point

at

which

the

contacts

make

can

be

determined

with

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

To

obtain

ad

-

justment

on

the

interlock

switch

(

6

)

,

bend

the

interlock

switch

arm

(

3

)

.

The

roller

and

crank

on

the

interlock

switch

(

6

)

should

have

1

/

32

"

to

1

/

16

"

overtravel

after

final

adjustment

.

CONTROL

DEVICE

ADJUSTMENT

Latch

Checking

Switch

Wipe

Auxiliary

Switch

Linkage

(

Furnished

Special

on

AM

-

2.4

/

4.16

-

100

/

Referring

to

Fig

.

6

,

rotate

the

trip

shaft

(

5

)

manually

clockwise

to

release

the

latch

checking

switch

arm

(

2

)

.

The

point

at

which

the

contacts

make

can

be

determined

with

a

circuit

continuity

tester

such

as

a

light

indicator

or

bell

set

.

To

obtain

adjustment

on

the

latch

checking

switch

(

4

)

,

bend

the

latch

checking

switch

arm

(

2

)

.

The

roller

and

crank

on

the

latch

checking

switch

(

4

)

should

have

1

/

32

to

1

/

16

overtravel

after

final

adjustment

150

A

-

3

and

-

150

/

25

QA

-

3

)

Refer

to

Fig

.

10

.

With

the

breaker

in

the

open

position

,

the

distance

from

the

center

line

of

the

front

bushings

(

1

)

to

the

center

of

the

slot

in

the

fork

lever

(

2

)

should

be

12

-

9

/

32

"

as

shown

.

To

change

this

setting

,

loosen

the

locking

bolts

(

3

)

and

move

the

fork

level

in

the

proper

direction

.

Tighten

the

lock

bolts

.

FINAL

INSPECTION

AND

TEST

1

.

For

ease

in

reviewing

the

adjustments

,

the

following

are

recapitulated

:

a

.

Primary

contact

wipe

:

5

/

16

"

+

0

-

1

/

16

"

.

Referring

to

Fig

.

7

,

measure

the

over

-

travel

of

the

two

auxiliary

switch

plungers

.

Manually

operate

the

control

device

by

pressing

the

operating

arm

(

5

)

the

full

extent

of

travel

to

the

rear

.

With

the

device

in

this

position

further

depress

the

plunger

(

4

)

on

the

top

auxiliary

switch

(

3

)

.

The

gap

between

the

plunger

and

operating

arm

should

be

1

/

32

"

or

greater

.

To

increase

the

overtravel

,

loosen

the

screws

(

2

)

and

move

the

switch

toward

the

rear

of

the

mounting

plate

.

Tighten

the

screws

and

recheck

the

adjustment

.

Impact

Trip

,

Current

Trip

,

Capacitor

Trip

,

and

Undervoltage

Trip

Devices

Fig

.

9

shows

the

necessary

settings

that

are

to

be

checked

when

these

devices

are

furnished

.

The

amount

of

wipe

between

the

trip

roller

(

16

)

and

the

trip

latch

(

15

)

should

be

3

/

32

"

to

5

/

32

"

.

This

can

be

altered

by

changing

the

number

of

shims

under

the

block

against

which

the

trip

plate

(

14

)

stops

.

In

order

to

trip

properly

,

the

clearance

between

the

trip

bolt

(

11

)

and

the

trip

plate

*

(

9

)

should

be

1

/

32

"

to

1

/

16

"

.

This

can

be

far

m

In

a

similar

manner

,

check

the

over

-

travel

on

the

back

auxiliary

switch

(

1

)

.

i

9

2

altered

by

releasing

the

check

nut

and

|

screwing

the

trip

bolt

(

11

)

in

or

out

of

the

i

reset

arm

(

8

)

.

^

"

'

•

2

*

When

an

undervoltage

device

is

fur

-

nished

check

the

clearance

between

the

f

?

*

'

.

trip

hammer

(

19

)

and

the

trip

plate

(

14

)

,

gy

with

the

undervoltage

coil

energized

.

This

clearance

should

be

1

/

32

"

to

1

/

16

"

and

can

be

altered

by

removing

the

connecting

pin

at

either

end

of

the

adjusting

rod

assembly

(

20

)

,

and

turning

the

clevis

at

that

end

.

&

3

BEFORE

MANUALLY

OPERATING

THE

CONTROL

DEVICE

,

MAKE

CERTAIN

THAT

ALL

CONTROL

POWER

TO

THE

BREAKER

HAS

BEEN

DISCONNECTED

.

MANUAL

OPERATION

OF

THE

CONTROL

DEVICE

WITH

CONTROL

POWER

CON

-

NECTED

WILL

ENERGIZE

THE

CLOSING

COIL

AND

PRODUCE

A

CLOSING

OPERA

-

TION

.

4

g

ry

*

:

cm

«

3

5

H

£

a

&

.

r

CUT

-

OFF

SWITCH

ADJUSTMENTS

(

AM

-

2.4

/

4.16

-

100

/

150

A

-

3

,

-

150

/

250

A

-

3

)

Refer

to

Fig

.

8

.

With

the

breaker

in

he

open

position

,

the

clearance

between

he

switch

plunger

and

the

adjusting

screw

is

obtained

by

pushing

the

switch

plunger

(

2

)

-

1

.

Cut

-

off

Switch

2

.

Switch

Plunger

3

.

Adjusting

Bolt

4

.

Washers

5

.

Lever

Ann

After

checking

all

the

mechanical

ad

-

justments

as

outlined

above

,

operate

the

devices

manually

to

make

certain

that

they

trip

and

reset

properly

.

Fig

.

8

Cut

-

off

Switch

Adjustments

6

Courtesy of NationalSwitchgear.com

rA

*

to

2

’

'

A

«

2

37

si

3

V

4

'

V

/

*

M

/

4

X

3

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

2

3

!

'

>

1

1

.

Front

Disconnect

Stud

2

.

Plunger

Interlock

Bolt

3

.

Washers

4

.

Connecting

Rod

5

.

Reset

Plate

6

.

Reset

Roller

7

.

Main

Operating

Shaft

8

.

Reset

Arts

9

.

Trip

Plate

10

.

Spring

11

.

Trip

Bolt

12

.

Clevis

13

.

Elevating

Bar

14

.

Impact

Trip

Plate

15

.

Trip

Latch

16

.

Trip

Roller

17

.

Trip

Armature

18

.

Trip

Lever

19

.

Undervoltage

Trip

Hamer

20

.

Adjusting

Rod

21

.

Manual

Trip

Button

22

.

Trip

Setting

Plate

23

.

Undervoltege

Device

{

!

4

-

3

.

14

15

&

i

*

16

i

•

nTO

*

17

18

\

&

o

IS

!

C

HTO

;

C

.

0

20

10

m

i

o

11

-

o

c

2

2

12

-

23

X

X

13

=

f

S

as

to

i

at

Fig

.

9

Adjustments

On

Current

Trip

Device

and

Undervoltage

Trip

Device

,

Show

With

The

Breaker

In

The

Closed

Position

c

*

u

_

2

3

4

5

6

4

.

See

that

all

bearing

surfaces

of

the

mechanism

have

been

lubricated

.

Refer

to

the

section

on

LUBRICATION

.

5

.

Operate

the

breaker

slowly

with

the

maintenance

closing

device

and

note

that

there

is

no

excessive

binding

or

friction

and

that

the

breaker

can

be

moved

to

the

fully

opened

and

fully

closed

positions

.

6

.

See

that

any

place

where

the

surface

of

the

paint

has

been

damaged

during

installation

is

repainted

immediately

.

HI

-

POTENTIAL

TEST

If

the

breaker

had

been

stored

for

a

long

period

of

time

,

it

is

recommended

that

the

insulation

be

checked

before

the

breaker

is

placed

in

service

.

A

standard

60

cycle

high

potential

test

at

14

,

000

volts

RMS

will

normally

indicate

whether

the

breaker

is

satisfactory

for

service

.

With

the

breaker

contacts

in

the

fully

opened

position

,

apply

the

high

potential

to

each

terminal

of

the

breaker

individually

for

one

minute

with

all

other

terminals

and

the

breaker

frame

grounded

.

After

high

potential

tests

are

made

on

organic

insulating

materials

,

these

materials

should

be

inspected

for

visible

leakage

current

paths

,

and

necessary

action

must

be

taken

to

replace

insulation

that

may

have

been

affected

by

moisture

absorption

.

The

high

potential

test

is

also

recommended

for

breakers

which

have

been

removed

from

service

and

stored

over

an

extended

period

of

time

under

unfavorable

atmospheric

conditions

.

I

1

.

Front

Bushing

2

.

Fork

Lever

3

.

Locking

Bolts

4

.

Pin

5

.

Link

6

.

Rod

i

i

,

s

V

CO

I

\

f

OJ

n

i

If

f

8

f

\

<

£

>

O

ai

Fig

.

10

Auxiliary

Switch

Linkage

u

_

b

.

Arcing

contact

wipe

:

5

/

16

”

or

greater

(

gap

at

primary

contacts

)

.

c

.

Primary

contact

gap

:

3

-

13

/

16

+

1

/

8

"

-

3

/

16

"

.

d

.

Trip

latch

wipe

:

3

/

16

"

to

1

/

4

"

with

trip

latch

resting

against

stop

pin

.

1

/

16

"

±

1

/

32

"

.

1

/

16

"

k

.

Impact

trip

roller

wipe

:

1

/

8

"

t

1

/

32

"

.

l

.

Impact

trip

bolt

clearance

:

3

/

64

"

±

1

/

64

"

.

m

.

Undervoltage

trip

hammer

clear

-

1

/

64

"

.

n

.

Plunger

interlock

(

100

/

150

-

3

and

150

/

250

-

3

)

:

15

-

19

/

32

"

+

1

/

16

"

.

ance

:

3

/

64

"

+

e

.

Prop

clearance

:

f

.

Closing

plunger

clearance

:

to

3

/

16

”

.

g

.

Interlock

switch

wipe

:

1

/

16

"

min

.

o

.

Auxiliary

switch

linkage

(

100

/

150

A

-

3

and

150

/

250

A

-

3

)

:

12

-

9

/

32

"

.

2

.

Check

all

nuts

,

washers

,

bolts

,

cotter

pins

,

and

terminal

connections

for

tightness

.

h

.

Control

device

switch

overtravel

:

1

/

32

"

min

.

i

.

Cut

-

off

switch

overtravel

:

1

/

32

"

max

.

j

.

Latch

checking

switch

wipe

:

1

/

16

"

min

.

AUXILIARY

DEVICES

3

.

Inspect

all

wiring

to

make

sure

that

no

damage

has

resulted

during

in

-

stallation

,

and

test

for

possible

grounds

or

short

circuits

.

On

breakers

that

are

equipped

with

auxiliary

devices

such

as

a

current

trip

,

undervoltage

trip

or

capacitor

trip

,

the

device

should

be

checked

for

proper

7

•

i

Courtesy of NationalSwitchgear.com

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

electrical

operation

.

The

current

trip

de

-

vice

should

trip

the

breaker

at

3

amperes

.

The

undervoltage

trip

device

should

trip

the

breaker

when

the

control

voltage

drops

below

30

to

60

%

of

rated

voltage

,

and

it

should

pick

up

at

80

%

of

the

control

volt

-

age

or

less

.

An

adjustment

plate

is

pro

-

vided

on

the

front

of

the

undervoltage

trip

device

as

an

aid

in

obtaining

the

desired

setting

.

NOTE

:

When

checking

the

pick

-

up

value

of

the

undervoltage

device

,

apply

a

voltage

equal

to

80

%

of

normal

control

voltage

to

the

undervoltage

device

coil

.

The

device

should

pick

up

at

this

value

.

Do

not

increase

the

voltage

gradually

on

this

coil

as

it

will

overheat

the

coil

,

producing

a

false

reading

,

,

and

may

damage

the

coil

if

excessive

over

-

heating

occurs

.

The

capacitor

trip

should

be

capable

of

tripping

the

breaker

as

late

as

25

seconds

after

the

control

voltage

is

removed

.

If

the

auxiliary

devices

do

not

perform

in

accordance

with

these

specifications

,

a

careful

examination

should

be

made

for

defective

parts

.

CONTROL

POWER

CHECK

After

the

breaker

has

been

closed

and

opened

slowly

several

times

with

the

maintenance

closing

device

,

and

the

mech

-

anism

adjustments

checked

as

described

above

,

the

operating

voltages

should

be

checked

at

the

closing

coil

and

trip

coil

terminals

.

For

electrical

operation

of

the

breaker

,

the

control

power

may

be

either

an

alternating

or

direct

current

source

.

The

operating

ranges

for

the

closing

and

tripping

voltages

are

given

on

the

breaker

nameplate

.

Ordinarily

,

standard

ranges

apply

which

are

as

follows

:

4

5

6

CM

8

8

oi

u

_

%

1

.

Shunting

and

Anti

-

Pusnp

Switch

*

2

.

Seal

-

in

Switch

*

*

3

.

Operating

Coil

4

.

Crank

5

.

Stationary

Contact

Assembly

6

.

Movable

Contact

Assembly

7

.

Arm

8

.

Arc

Chute

9

.

Trip

Lever

10

.

Plunger

Guide

Fig

.

II

Control

Device

CLOSING

RANGE

NOMINAL

VOLTAGE

TRIPPING

RANGE

125

V

.

d

-

C

250

V

.

d

-

c

230

V

.

a

-

c

90

-

130

V

.

d

-

c

180

-

260

V

.

d

-

c

190

-

250

V

.

a

-

c

70

-

140

V

.

d

-

c

140

-

280

V

.

d

-

c

190

-

250

V

.

a

-

c

CO

§

8

When

repetitive

operation

is

re

-

NOTE

:

quired

from

a

direct

current

source

,

the

closed

circuit

voltage

at

the

closing

coil

should

not

exceed

115

V

.

d

-

c

and

230

V

.

d

-

c

at

the

nominal

voltages

of

125

V

.

d

-

c

and

250

V

.

d

-

c

respectively

.

CO

9

i

10

CM

I

I

ca

For

a

-

c

operation

,

two

copper

-

oxide

rectifiers

,

mounted

elsewhere

in

the

metal

-

clad

unit

,

are

used

.

A

tapped

resistor

is

provided

in

each

rectifier

circuit

to

control

the

d

-

c

voltage

.

The

resistor

setting

should

be

adjusted

so

that

the

closed

circuit

volt

-

age

at

the

breaker

closing

coil

terminals

is

110

to

120

volts

d

-

c

.

Where

repetitive

operation

is

set

at

105

to

(

2

u

_

13

14

required

,

the

voltage

should

be

115

volts

d

-

c

.

/

V

/

/

A

Resistor

Setting

,

Ohms

*

a

-

c

Volts

(

Closed

Circuit

)

Winter

Summer

1

/

4

0

190

-

196

194

-

206

204

-

216

214

-

226

224

-

236

234

-

246

244

-

250

1

.

Main

Crank

2

.

Trip

Latch

3

.

Trip

Roller

4

.

Closing

Roller

5

.

Piston

Ring

6

.

Closing

Armature

7

.

Armature

Guide

Bolts

8

.

Spring

Retainer

9

.

Opening

Spring

,

Inner

10

-

Opening

Spring

,

Outer

11

.

Closing

Pin

12

.

Prop

13

.

Closing

Coil

14

.

Qosing

Plunger

Rod

1

/

2

0

1

/

4

1

/

2

1

/

4

3

/

4

1

/

2

1

1

-

1

/

4

1

-

1

/

4

3

/

4

1

*

a

-

c

Volts

as

measured

across

the

rec

-

tifier

and

a

-

c

series

resistor

.

Fig

.

12

Cross

Section

of

MS

-

13

Operating

Mechanism

in

the

Open

position

8

Courtesy of NationalSwitchgear.com

Magne

-

Blast

Circuit

Breaker

Type

AM

GEH

-

2000

The

a

guide

•

articular

combination

of

ambient

temper

-

ture

and

a

-

c

supply

voltage

.

Summer

set

-

tings

are

used

where

ambient

temperatures

are

normally

above

freezing

(

32

°

F

)

.

It

is

necessary

to

use

winter

settings

where

the

ambient

temperature

may

drop

to

20

°

F

or

less

at

any

time

,

explanation

of

copper

-

oxide

rectifiers

for

circuit

breaker

application

,

refer

to

In

-

struction

Book

GEI

-

11306

.

preceding

tabulation

is

included

as

for

adjusting

the

resistors

for

the

and

read

the

d

-

c

voltage

at

the

closing

coil

terminals

.

relay

to

de

-

energize

the

circuit

.

required

to

close

simultaneously

,

the

closed

circuit

voltage

at

the

closing

coil

of

each

breaker

must

fall

within

the

specified

limits

.

Release

the

closing

DO

NOT

MAINTAIN

VOLTAGE

ON

THE

CLOSING

COIL

ANY

LONGER

THAN

THE

FEW

SECONDS

REQUIRED

TO

READ

THE

VOLTMETER

.

These

coils

are

designed

for

intermittent

operation

and

will

be

damaged

by

prolonged

current

flow

.

Electrical

closing

or

opening

is

ac

-

complished

by

merely

energizing

the

closing

or

trip

coil

circuit

.

Control

switches

are

provided

for

this

purpose

on

the

metal

-

clad

unit

.

It

is

also

possible

to

trip

the

breaker

manually

by

pressing

the

manual

trip

button

(

6

)

,

Fig

.

1

.

For

a

more

detailed

If

the

closed

circuit

voltage

at

the

ter

-

minals

of

the

closing

coil

does

not

fall

in

the

specified

range

,

proceed

as

follows

:

To

check

the

d

-

c

voltage

at

the

closing

coil

terminals

,

proceed

as

follows

:

When

all

the

foregoing

inspection

de

-

tails

have

been

checked

,

the

breaker

may

be

safely

placed

in

service

.

Before

the

breaker

is

finally

raised

into

position

in

the

metal

-

clad

unit

,

rub

a

small

amount

of

G

.

E

.

Contact

Lubricant

D

50

H

28

on

the

silvered

portion

of

the

breaker

studs

to

form

a

thin

coating

for

contacting

purposes

.

1

.

a

-

c

control

power

source

-

Decrease

the

series

resistance

to

increase

the

d

-

c

voltage

,

or

increase

the

series

re

-

sistance

to

decrease

the

d

-

c

voltage

.

Recheck

voltage

at

the

closing

coil

.

2

.

d

-

c

control

power

source

-

Check

volt

-

age

at

the

source

of

power

and

line

drop

between

the

power

source

and

breaker

.

1

.

Mechanism

with

a

control

device

,

Fig

.

Close

the

breaker

by

manually

operating

the

control

device

.

Hold

the

contacts

in

the

closed

position

and

read

the

d

-

c

voltage

at

the

closing

coil

ter

-

minals

.

release

the

control

device

.

11

.

To

de

-

energize

the

circuit

,

NOTE

:

This

breaker

mechanism

com

-

bination

is

designed

only

for

electrical

closing

when

in

use

.

NEVER

ATTEMPT

MANUAL

CLOSING

WITH

THE

BREAKER

IN

SERVICE

,

for

under

such

conditions

,

sufficient

closing

force

and

speed

cannot

be

applied

.

2

.

Mechanism

with

cut

-

off

switch

,

Fig

.

8

.

Close

the

breaker

by

manually

oper

-

ating

the

control

relay

located

in

the

metal

-

clad

unit

.

Hold

the

relay

closed

When

two

or

more

breakers

,

operating

from

the

same

control

power

source

,

are

OPERATION

CLOSING

OPERATION

the

trip

coil

,

the

trip

plunger

rotates

the

trip

latch

(

2

)

,

Fig

.

12

,

causing

the

oper

-

ating

mechanism

linkage

to

collapse

.

The

energy

stored

in

the

opening

springs

(

9

and

10

)

is

thus

released

,

opening

the

breaker

.

During

this

operation

,

the

trip

coil

circuit

is

de

-

energized

,

and

upon

completion

of

the

opening

operation

,

the

operating

mechan

-

ism

is

returned

to

its

normal

position

,

ready

for

closing

.

allowing

the

armature

to

return

by

gravity

to

its

original

position

.

The

control

device

plunger

also

mechanically

trips

the

seal

-

in

switch

,

de

-

energizing

the

control

device

coil

if

the

closing

control

switch

is

not

closed

.

If

the

closing

control

switch

is

held

in

the

closed

position

throughout

and

after

the

breaker

closing

operation

,

the

control

de

-

vice

linkage

will

remain

picked

up

and

be

unable

to

reset

to

prepare

for

another

breaker

closing

operation

.

This

arrange

-

ment

insures

that

"

pumping

"

of

the

breaker

will

not

occur

during

a

trip

-

free

oper

-

ation

.

The

closing

operation

of

the

breaker

is

primarily

controlled

by

the

control

device

,

Fig

.

11

,

mounted

on

the

operating

chanism

.

The

closing

sequence

is

in

-

ated

from

a

control

switch

mounted

on

the

door

of

the

metal

-

clad

unit

or

at

a

.

re

-

mote

operating

station

.

Operation

of

the

closing

control

switch

energizes

the

pick

-

up

coil

of

the

control

device

.

As

the

control

device

closes

,

seal

-

in

contacts

shunt

the

closing

control

switch

to

allow

the

opening

of

the

closing

control

switch

contacts

without

affecting

the

overall

closing

operation

.

This

type

of

arrangement

assures

complete

clos

-

ing

of

the

breaker

with

only

momentary

contact

of

the

closing

control

switch

.

As

the

breaker

opens

,

the

main

con

-

tacts

part

first

,

shunting

the

current

through

the

arcing

contacts

.

An

arc

forms

as

the

arcing

contacts

part

.

See

Fig

.

13

.

As

the

movable

arcing

contact

(

27

)

is

withdrawn

through

the

slot

in

the

arc

runner

,

the

upper

end

of

the

arc

is

transferred

to

the

upper

arc

runner

(

4

)

.

To

assist

the

interruption

at

this

point

,

a

stream

of

air

is

emitted

from

the

booster

tube

(

28

)

and

forces

the

arc

onto

the

lower

arc

runner

(

10

)

.

Estab

-

lishment

of

the

arc

on

the

runners

auto

-

matically

inserts

the

blowout

coils

into

the

circuit

,

introducing

a

magnetic

field

between

the

pole

pieces

which

tends

to

draw

the

arc

away

from

the

arcing

contacts

.

The

250

MVA

interrupter

contains

one

upper

mag

-

netic

blowout

coil

and

one

lower

blowout

coil

,

each

individually

connected

in

series

with

its

respective

arc

runner

.

The

arc

is

forced

outward

along

the

diverging

arc

runners

by

the

magnetic

field

.

The

operating

sequence

for

breakers

designed

for

MI

-

6

metal

-

clad

equipment

is

similar

to

that

described

above

except

that

a

relay

mounted

elsewhere

in

the

metal

-

clad

unit

replaces

the

control

device

.

Also

,

a

cut

-

off

switch

(

Fig

.

8

)

is

used

to

replace

the

mechanical

trip

arrange

-

ment

of

the

control

device

.

The

cut

-

off

switch

energizes

an

auxiliary

relay

to

de

-

energize

the

main

relay

.

The

closing

speed

of

the

arcing

contact

should

be

7

to

10

feet

per

second

for

the

100

/

150

MVA

breakers

and

9

to

12

feet

per

second

for

the

150

/

250

MVA

breakers

with

rated

closed

circuit

voltage

at

the

closing

coil

terminals

,

the

average

speed

of

the

movable

arcing

contact

from

a

point

1

"

before

the

tip

is

tangent

to

the

lower

surface

of

the

upper

arc

runner

to

the

tangent

position

.

those

Operation

of

the

control

device

ener

-

gizes

the

breaker

closing

coil

by

closing

the

main

control

device

contacts

(

5

and

6

)

,

Fig

.

11

.

Once

the

control

device

contacts

are

picked

up

,

they

are

electrically

held

in

the

closed

position

until

the

breaker

closing

operation

is

completed

.

Energizing

the

breaker

closing

coil

raises

the

armature

(

6

)

,

Fig

.

12

which

in

turn

lifts

the

closing

roller

(

4

)

through

plunger

(

14

)

.

is

transmitted

through

the

mechanism

link

-

age

and

rotates

the

main

crank

(

1

)

,

closing

the

breaker

contacts

.

As

the

armature

reaches

the

end

of

its

travel

,

the

prop

(

12

)

rotates

beneath

the

pin

(

11

)

latching

the

breaker

in

the

closed

position

.

During

the

operation

,

the

opening

springs

(

9

are

compressed

in

readiness

for

an

This

motion

These

speeds

represent

closing

and

10

)

opening

operation

.

Air

trapped

above

the

armature

acts

as

a

dashpot

to

absorb

the

energy

of

the

mechanism

as

it

approaches

the

end

of

its

stroke

.

At

the

same

time

,

the

arc

is

being

forced

into

the

arc

chute

(

8

)

which

is

com

-

posed

of

a

series

of

gradually

interleaving

insulating

fins

.

These

fins

,

which

project

alternately

from

the

two

opposite

inner

surfaces

of

the

chute

,

elongate

the

arc

into

a

gradually

deepening

serpentine

path

,

so

that

the

electrical

resistance

in

the

paUi

of

the

arc

is

rapidly

increased

and

the

heat

from

the

arc

is

absorbed

.

The

increased

resistance

reduces

both

the

magnitude

and

OPENING

OPERATION

An

electrical

opening

operation

is

in

-

itiated

by

energizing

the

trip

coil

.

This

is

accomplished

either

by

actuating

the

opening

control

switch

on

the

metal

-

clad

unit

or

by

a

combination

of

relays

and

cur

-

rent

devices

used

to

detect

a

fault

on

the

load

side

of

the

breaker

.

By

energizing

Slightly

before

tlje

mechanism

latches

,

control

device

plunger

(

5

)

,

Fig

.

23

,

lanically

trips

the

main

control

device

.

acts

,

de

-

energizing

the

closing

coil

and

9

i

i

i

t

Courtesy of NationalSwitchgear.com

t

%

GEH

-

2000

Magne

-

Blast

Circuit

Breaker

Type

AM

14

15

16

I

—

17

$

2

-

<

0

O

3

18

CM

5

19

CO

©

1

u

.

-

20

4

21

5

-

2 2

6

23

24

8

25

26

—

27

9

28

29

10

L

.

+

.

W

II

\

I

30

12

I

\

I

I

x

I

rw

]

I

13

I

J

-

f

\

o

/

Operating

Rod

Stationary

Primary

Contacts

Movable

Primary

Contacts

Cup

Bearing

Yoke

Movable

Contact

Arm

Assembly

Movable

Arcing

Contact

Booster

Tube

Connection

Bar

Booster

Cylinder

and

Piston

21

.

11

.

Blow

-

out

Coil

12

.

Blow

-

out

Core

13

.

Muffler

14

.

Front

Bushings

15

.

Rear

Bushings

16

-

Frame

17

.

Operating

Crank

18

.

Upper

Horizontal

Barrier

19

.

Spring

Retainer

20

.

Lower

Horizontal

Barrier

Box

Barrier

Handle

Blow

-

out

Core

Blow

-

out

Coil

Arc

Runner

Pole

Piece

Stationary

Arcing

Contact

Box

Barrier

Arc

Chute

Pole

Piece

Arc

Runner

1

.

22

.

2

.

23

.

3

.

24

.

4

.

25

.

S

.

26

.

6

.

27

.

7

.

28

.

8

.

29

.

9

.

30

.

10

.

Fig

.

13

Cross

Section

Of

Breaker

Pole

Unit

10

Courtesy of NationalSwitchgear.com