GE MicroVersaTrip AK-50 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

5

Inhaltsverzeichnis

Andere GE Schutzschalter Handbücher

GE

GE Power Break II Bedienungsanleitung

GE

GE AM-4.16-250-9 Bedienungsanleitung

GE

GE Spectra Series Bedienungsanleitung

GE

GE AKR-30S Bedienungsanleitung

GE

GE Power Break II Bedienungsanleitung

GE

GE GL 310 F1/4031 P/VR Bedienungsanleitung

GE

GE AM-4.16-250-6 Bedienungsanleitung

GE

GE Spectra Series AMCB6FGB Bedienungsanleitung

GE

GE MicroVersaTrip Plus Bedienungsanleitung

GE

GE AKR-30S Bedienungsanleitung

GE

GE Power Break II Bedienungsanleitung

GE

GE MicroVersaTrip Plus Series Bedienungsanleitung

GE

GE SecoVac Series Bedienungsanleitung

GE

GE A Series Pro-Stock TQD Bedienungsanleitung

GE

GE Spectra Series AMC3FGB Bedienungsanleitung

GE

GE SPRCS024 Bedienungsanleitung

GE

GE ML-14-0 Bedienungsanleitung

GE

GE EntelliGuard G Benutzerhandbuch

GE

GE AK-2-15 Bedienungsanleitung

GE

GE Gerapid 2607 Bedienungsanleitung

GE

GE Power Break II Bedienungsanleitung

GE

GE Spectra Series AMC6FGB Bedienungsanleitung

GE

GE MicroVersaTrip Plus Bedienungsanleitung

GE

GE ReliaGear Pro-Stock THQB Bedienungsanleitung

Beliebte Schutzschalter Handbücher anderer Marken

ABB

ABB SACE Emax 2 E2.2 Bedienungsanleitung

Eaton

Eaton NOVA LBS 15 Bedienungsanleitung

Gewiss

Gewiss 90 RCD Bedienungsanleitung

ABB

ABB SACE Emax E1 Bedienungsanleitung

Siemens

Siemens SIRIUS 3RV1742 Bedienungsanleitung

WEG

WEG FHU ACW125 Bedienungsanleitung

Siemens

Siemens Sentron 3VA9157-0PK1 Series Bedienungsanleitung

hager

hager TS 303 Montageanleitung

ETI

ETI EFI-4B Bedienungsanleitung

nader

nader NDM3EU-225 Bedienungsanleitung

TERASAKI

TERASAKI NHP TemBreak PRO P160 Series Bedienungsanleitung

Gladiator

Gladiator GCB150 Bedienungsanleitung

Eaton

Eaton 50DHP-VR Handbuch

ABB

ABB SACE Emax 2 E6.2 Handbuch

OEZ

OEZ LFN Bedienungsanleitung

Eaton

Eaton Power Defense PDG2 Handbuch

Bticino

Bticino L4412CM2 Bedienungsanleitung

Eaton

Eaton S-T0 Handbuch

GEI

-

“

MAINTENANCE

MANUAL

GFH

.

?

71

GtHA

7

\

GfH

-

li

;

GF

/

-

50

J

Gtl

-

501

GFJ

-

502

Gf

/

*

57

C

r

V

LOW

-

VOLTAGE

POWER

CIRCUIT

BREAKERS

TYPES

t

-

.

AK

-

50

,

AK

-

75

,

AK

-

100

,

AKF

-

1

C

,

AKF

-

1

D

,

AKF

-

2

D

f

LOW

VOLTAGE

SWITCHGEAR

DEPARTMENT

GENERAL

0

ELECTRIC

Courtesy of NationalSwitchgear.com

n

4

%

»

<

rl

Jr

•

^

CONTENTS

Page

3

INTRODUCTION

3

OPERATION

MANUAL

CLOSING

MANUAL

MAINTENANCE

CLOSING

OF

ELECTRICAL

BREAKERS

ELECTRICAL

CLOSING

ELECTRICAL

TRIPPING

3

3

3

4

4

MAINTENANCE

INSERTING

SAFETY

PIN

-

AK

-

50

,

AK

-

75

AND

AK

-

100

INSPECTION

LUBRICATION

'

SEPARATION

OF

FRONT

AND

REAR

FRAMES

.

..

.

TROUBLE

SHOOTING

4

5

5

5

6

7

BASIC

BREAKER

COMPONENTS

ARC

QUENCHERS

POLE

UNIT

ASSEMBLY

.

.

OPERATING

MECHANISMS

AUXILIARY

SWITCH

.

..

.

7

8

11

1 8

1 9

ELECTRICAL

CLOSING

DEVICES

AND

CONTROLS

CLOSING

SWITCH

CUT

-

OFF

SWITCHES

CONTROL

RELAY

19

19

19

4

PROTECTIVE

DEVICES

'

TIME

-

DELAY

UNDERVOLTAGE

TRIPPING

DEVICE

INSTANTANEOUS

UNDERVOLTAGE

TRIPPING

DEVICE

DIRECT

-

ACTING

TRIPPING

DEVICE

-

EC

-

1

DIRECT

-

ACTING

TRIPPING

DEVICES

-

EC

-

1

A

AND

EC

-

IB

SERIES

OVERCURRENT

TRIPPING

DEVICE

-

EC

-

1

SERIES

OVERCURRENT

TRIPPING

DEVICE

-

EC

-

2

(

AK

-

1

-

50

ONLY

)

REVERSE

CURRENT

TRIPPING

DEVICE

(

AK

-

50

ONLY

)

20

20

20

21

22

23

26

26

28

SELECTIVE

TRIPPING

26

BREAKER

ACCESSORIES

PRIMARY

DISCONNECTS

(

AK

-

50

ONLY

)

SECONDARY

DISCONNECTS

DRAWOUT

MECHANISM

SHUNT

-

TRIPPING

DEVICE

BELL

ALARM

AND

LOCKOUT

DEVICE

DYNAMIC

BRAKE

FOR

ELECTRICAL

BREAKERS

28

28

29

29

30

31

32

MISCELLANEOUS

.

.

.

TOOLS

RENEWAL

PARTS

32

32

17

MM

instructions

do

noI

purport

to

cover

a

/

/

dttaf

’

/

c

or

variations

in

equipment

nor

to

provide

for

every

possible

contingency

to

be

met

in

connection

with

mttatiofion

,

operation

or

mointenonce

.

Should

further

information

be

defired

or

should

particular

problems

arise

which

ore

not

covered

sufficiently

for

the

purchaserpurposes

,

the

matter

should

be

referred

to

the

General

Electric

Company

.

Courtesy of NationalSwitchgear.com

LOW

-

VOLTAGE

POWER

CIRCUIT

BREAKERS

Types

AK

-

50

,

AK

-

75

,

AK

-

100

,

AKF

-

1

C

,

AKF

-

1

D

,

AKF

-

2

D

f

1

INTRODUCTION

peciallyfor

use

in

controlling

the

shunt

field

circuits

of

synchronous

motors

or

generators

.

These

breakers

are

two

-

pole

power

circuit

breakers

with

field

discharge

contacts

placed

in

the

center

pole

.

Opening

of

the

breaker

’

s

outer

poles

closes

the

field

discharge

contacts

,

thus

connecting

a

discharge

resistor

across

the

field

of

the

genera

-

tor

or

motor

.

Type

AK

power

circuit

breakers

are

are

intended

to

impart

the

necessary

designed

for

general

use

on

all

types

of

information

required

for

proper

main

-

low

-

voltage

circuits

.

These

breakers

tenance

and

replacement

of

component

are

particularly

applicable

for

protec

-

parts

and

accessories

for

AK

-

50

,

-

75

,

tion

and

control

of

feeder

and

branch

-

lOOand

AKF

-

1

C

,

-

ID

,

-

2

Dpowercir

-

circuits

in

buildings

,

industry

,

power

cuit

breakers

.

Before

performing

any

stations

,

and

marine

applications

,

maintenance

procedures

,

the

associ

-

ated

section

(

s

)

of

these

instructions

should

be

carefully

and

thoroughly

read

,

cial

type

of

AK

breaker

designed

es

-

The

instructions

contained

herein

r

The

AKF

Type

breakers

are

a

spe

-

OPERATION

NOTE

'

Mil

If

L

;

TSMT

*

*

*

"

•

'

*

*

i

i

MANUAL

CLOSING

REMOVE

JUMPERS

Ah

A

3

AND

A

2

-

A

4

WHEN

ALTERNATE

WIRING

IS

USED

For

a

description

of

manual

clos

-

ing

,

refer

to

the

section

of

these

in

-

structions

entitled

CLOSING

THE

BREAKER

-

MANUALLY

OPERATED

AK

-

1

-

50

and

the

section

entitled

AK

-

2

-

50

,

-

75

AND

-

100

STORED

ENERGY

MANUAL

MECHANISM

,

both

under

OPERATING

MECHANISMS

.

A

A

!

v

r

-

I f

KB

,

*

*

*

f

f

-

T

3

-

KB

—

I

i

i

l

_

.

T

4

—

-

0

2

P

^

-

R

2

—

—

Sfcl

-

Jifcc

:

o

2

]

re

-

KB

—

W

4

K

:

>

r

-

vi

-

HLrJi

—

-

o

r

‘

AOOmONAL

AUK

_

L

CONTACTS

WHEN

REO

.

-

0 4

JL

D

6

L

*

8

!

E

.

SB

-

-

*

-

*

a

—

KS

—

-

o

-

o

2

-

o

Jo

-

0 4

o

o

So

0

(

0

LI

—

5

I

(

I

!

o

4

o

o

S

o

o

6

o

I

2

4

2

*

I

MANUAL

MAINTENANCE

CLOSING

OF

ELECTRICAL

BREAKERS

CONNECTION

DIAGRAM

|

v

?

Kt

v

?

i

r

I

ITT

F

4

FI

FJ

T

LIC

r

43

pi

n

G

1

G

4

e

RJ

AJ

Sk

4

2

M

2

)

«

,

T

1

>

An

electrical

breaker

may

be

closed

manually

by

means

of

the

maintenance

handle

furnished

with

the

breaker

.

M

*

0

I

1

R

-

(

M

TRANS

T

.

C

.

g

“

HV

yi

r

-

O

ND

vn

x

N

To

observe

the

operation

of

the

breaker

without

power

,

with

the

breaker

open

and

springs

discharged

,

proceed

as

follows

:

ALTERNATE

WIRING

USED

WTTM

FOLLOWING

POWER

VOLTAGE

RATING

’

J

00

/

2

JO

VAC

SO

~

460

/

230

VAC

2

S

rv

46

CV

2

J

0

V

AC

50

#

v

46

CV

230

V

AC

60

rv

575

/

2

JO

V

AC

25

rv

575

/

2

JO

V

AC

50

rv

575

/

230

V

.

AC

60

rv

CUSTOMER

WIRING

FACTORY

WIRING

-

FACTORY

WIRING

FOR

ENCLOSED

BRKRS

CUSTOMER

WIRING

FOR

STATIONARY

BRKRS

.

1

.

Charge

the

closing

spring

with

the

maintenance

handle

(

I

,

Fig

.

3

)

until

the

indicator

reads

Mcbarged

”

.

i

W

MX

-

ter

"

VFUSE

CLOSE

^

FUSE

AI

:

U

AS

2

.

Continue

to

operate

the

mainte

-

nance

handle

until

the

breaker

closes

.

P B

Bl

TWP

KV

UST

OF

ABBREVIATIONS

2

«

2

LI

KS

A

-

TERMMAL

BOARD

FRONT

VIEW

B

-

TERMINAL

BOARD

LOCATED

LEFT

WOE

FRONT

VIEW

LOCATED

LEFT

ROE

02

«

•

ALDLSW

.

3

.

Open

the

breaker

by

pushing

the

trip

button

(

5

,

Fig

.

2

)

.

J

1

uc

GI

FI

III

64

sT

Kl

>

U

\

fTWP

COIL

)

KJ

OFF

SWITCHES

KB

M

2

K

-

CLOSING

RCUW

TYPE

KG

A

.

00

L

-

AUXILIARY

SW

VB

*

b

"

CONTACTS

TYPE

SB

-

12

(

AUX

.

SWJ

M

-

SHUNT

TRIP

(

TGJ

P

-

PUSH

BUTTON

CLOSING

SW

ON

0

RKR

.

I

0

B

)

R

-

CLOSING

SPRING

CHARGING

MOTOR

<

M

)

T

-

AUXILIARY

POWER

TRANSFORMER

{

TRANS

)

R

ELECTRICAL

CLOSING

R

2

BJ

A

2

Figure

1

shows

the

typical

ele

-

mentary

and

connection

diagrams

for

the

control

system

of

electrically

oper

-

fitpH

hroalrovc

evranl

hroaborc

whirh

ELEACNTARY

DIAGRAM

^

L

-

FUSE

-

FUSE

-

<

“

)

Y

l

-

)

Y

Courtesy of NationalSwitchgear.com

GEI

-

74600

Low

-

voltage

Power

Circuit

Breakers

Mechanism

.

It

shows

the

control

cir

-

\

cult

when

the

closing

springs

are

dis

-

•

charged

and

the

breaker

open

.

When

rated

voltage

is

applied

to

the

control

circuit

,

the

motor

R

(

l

-

2

)

is

en

-

ergized

through

closing

relay

contacts

K

(

8

-

4

)

(

3

-

7

)

and

cutoff

switch

contacts

G

(

2

-

l

)

(

3

-

4

)

.

As

the

motor

charges

the

closing

springs

,

the

F

and

G

cutoff

switches

are

mechanically

operated

,

opening

the

G

contacts

and

closing

the

F

contacts

.

When

contacts

G

(

1

-

2

)

(

3

-

4

)

open

,

the

motor

is

de

-

energized

,

with

the

closing

springs

now

in

the

’

tharged

"

position

and

ready

for

a

closing

signal

.

The

indicator

on

the

front

escutcheon

will

indicate

the

charged

position

.

A

closing

signal

now

given

energizes

the

closing

relay

K

(

5

-

6

)

,

whose

con

-

tacts

K

(

8

-

2

)

(

1

-

7

)

close

,

with

the

relay

being

sealed

in

by

contacts

K

(

8

-

2

)

and

F

(

4

-

3

)

.

With

the

closing

relay

ener

-

gized

and

the

F

cutoff

switch

contacts

closed

,

the

motor

R

(

l

-

2

)

is

again

ener

-

gized

through

contacts

K

(

8

-

2

)

,

F

(

2

-

l

)

,

and

K

(

l

-

7

)

,

further

charging

the

clos

-

ing

springs

and

causing

the

output

crank

of

the

gear

reduction

unit

to

go

over

a

top

dead

-

center

position

.

Be

-

yond

this

position

the

springs

discharge

independently

of

the

charging

motor

sand

the

breaker

closes

.

6

1

.

Auxiliary

Switch

Z

.

Channel

-

shaped

Bar

3

.

Position

Indicator

4

.

Relay

5

.

Manual

Trip

Button

6

.

Closing

Button

7

.

Shaft

for

Manual

Mainte

-

nance

Closing

Handle

8

.

Spring

Charged

-

Discharged

Indicator

9

.

Motor

Cut

-

off

Switches

10

.

Arc

Quencher

Froni

view

of

AK

-

J

-

50

breaker

Fig

.

2

.

ELECTRICAL

TRIPPING

rotating

the

trip

shaft

and

displacing

the

trip

latch

.

When

the

breaker

closes

,

the

cutoff

switches

revert

to

their

original

po

-

sition

and

on

release

of

the

closing

switch

,

relay

x

is

de

-

energized

and

the

motor

recharges

the

springs

to

the

pre

-

charged

position

.

On

some

models

,

an

auxiliary

switch

,

fb

"

contact

is

placed

in

the

motor

circuit

to

prevent

pre

-

charging

when

the

breaker

is

in

the

closed

position

.

The

breaker

may

be

tripped

elec

-

trically

by

any

of

the

electrical

trip

-

ping

devices

described

in

these

in

-

structions

.

The

breaker

may

also

be

tripped

by

the

automatic

over

cur

rent

or

reverse

current

tripping

devices

,

if

so

equipped

.

All

these

devices

trip

the

breaker

in

a

similar

manner

,

i

.

e

.

the

device

trip

arm

moves

against

the

trip

paddles

fastened

on

the

trip

shaft

,

thus

The

most

commonly

used

tripping

device

is

the

shunt

trip

device

con

-

nected

in

the

control

circuit

as

shown

in

Fig

.

1

.

When

a

tripping

signal

is

given

,

the

shunt

trip

coil

M

(

i

-

2

)

is

energized

through

a

normally

-

open

auxiliary

switch

"

a

"

contact

L

(

l

-

lc

)

,

thus

tripping

the

breaker

.

MAINTENANCE

BEFORE

INSPECTION

OR

ANY

MAINTENANCE

WORK

IS

DONE

,

BE

SURE

THAT

THE

BREAKER

IS

IN

THE

OPEN

POSITION

.

ALL

ELEC

-

TRICAL

POWER

,

BOTH

PRIMARY

AND

CONTROL

SOURCES

,

SHOULD

ALSO

BE

DISCONNECTED

.

is

in

the

open

position

and

the

closing

springs

are

being

re

-

strained

by

the

safety

pin

.

The

procedure

for

inserting

the

safety

pin

is

given

below

.

INSERTING

SAFETY

PIN

AK

-

50

,

-

75

and

-

100

(

Fi

9

.

3

)

The

closing

spring

should

be

charged

with

the

maintenance

handle

(

1

)

so

that

the

safety

pin

(

3

)

can

be

placed

in

the

hole

of

the

push

rod

(

2

)

.

Con

-

tinue

to

operate

the

maintenance

han

-

so

that

the

safety

pin

takes

the

spring

force

*

To

install

the

safety

pin

of

the

AK

-

2

manual

stored

-

energy

mecha

-

nism

refer

to

the

section

entitled

AK

-

2

STORED

-

ENERGY

MANUAL

MECHA

-

NISM

on

page

14

of

these

instructions

.

Warning

;

On

breakers

em

-

ploying

stored

-

energy

closing

mechanisms

,

care

must

be

taken

when

the

circuit

breaker

is

being

installed

and

when

any

inspection

or

maintenance

work

With

the

safety

pin

restraining

the

closing

spring

force

,

the

contacts

will

close

slowly

when

the

breaker

is

manu

-

ally

operated

allowing

the

operation

of

the

mechanism

and

the

contact

align

-

i

c

hAi

'

ntr

Arma

enfkaf

tKo

alar

i

nrr

tlto

Kraalrar

c

ie

+

K A

Iti

^

Iinllvv

AKP

nn

Courtesy of NationalSwitchgear.com

Low

-

voltage

Power

Circuit

Brmakors

GEI

-

74600

f

points

and

sliding

surfaces

should

be

lubricated

at

the

regular

inspection

periods

with

a

thin

film

of

G

-

E

Lubri

-

cant

D

50

H

15

.

Hardened

grease

and

dirt

should

be

removed

from

latch

and

bearing

surfaces

by

using

kerosene

.

ALL

EXCESS

LUBRICANT

SHOULD

BE

REMOVED

WITH

A

CLEAN

CLOTH

TO

AVOID

ANY

ACCUMU

-

LATION

OF

DIRT

OR

DUST

.

t

CO

lT

>

0

C

c

at

The

use

of

cotton

waste

to

wipe

bearing

surfaces

should

be

avoided

,

as

the

cotton

ravelings

may

become

entangled

under

the

bearing

surfaces

and

destroy

the

surface

of

the

bearing

.

r

On

drawout

breakers

,

the

contact

surface

of

the

disconnect

studs

should

be

greased

with

G

-

E

Grease

Specifica

-

tion

D

50

H

47

.

SEPARATION

OF

FRONT

AND

REAR

FRAMES

To

repair

or

replace

contacts

,

op

-

erating

mechanism

,

or

the

overcurrent

devices

,

the

front

frame

must

be

sepa

-

rated

from

the

back

frame

.

To

sepa

-

rate

the

two

frames

proceed

as

follows

:

1

.

The

breaker

contacts

must

be

open

with

the

safety

pin

in

place

.

(

See

MAINTENANCE

.

)

2

.

Remove

the

two

opening

springs

(

on

lower

part

of

breaker

)

from

the

outside

pole

units

.

3

.

Remove

the

clevis

pin

(

14

,

Fig

.

6

)

(

13

,

Fig

.

7

)

from

the

center

pole

unit

.

1

.

Manual

Maintenance

Handle

2

.

Push

Rod

3

.

Safety

Pin

View

showing

operation

of

AK

-

I

-

50

breaker

with

manual

maintenance

handle

and

installation

of

safety

pin

Fig

.

3

.

Following

the

inspection

period

,

the

closing

springs

must

be

recharged

,

the

safety

pin

removed

from

the

push

rod

,

and

the

pin

placed

in

the

retain

-

ing

spring

clip

adjacent

to

the

push

rod

.

spection

of

the

breaker

should

be

made

including

connections

,

contacts

and

flexible

connectors

.

(

At

all

times

it

is

important

not

to

permit

pencil

lines

,

paint

,

oil

or

other

foreign

materials

to

remain

on

the

in

-

sulating

surfaces

of

the

breaker

as

they

may

cause

low

resistance

between

points

of

different

potential

and

result

in

eventual

electrical

breakdown

.

INSPECTION

Periodic

inspection

of

the

circuit

breaker

is

recommended

at

least

once

a

year

.

More

frequent

inspections

are

recommended

if

severe

load

conditions

,

dust

,

moisture

or

other

unfavorable

conditions

exist

.

A

complete

inspec

-

tion

of

the

breaker

,

including

contacts

and

arc

quenchers

,

should

always

be

made

after

the

breaker

has

interrupted

a

short

-

circuit

.

4

.

Remove

the

six

nuts

from

the

back

frame

using

a

socket

wrench

with

an

extension

.

These

include

the

two

nuts

at

the

top

of

the

frame

.

5

.

Remove

the

auxiliary

switch

op

-

erating

rod

(

5

,

Fig

.

17

)

.

6

.

Check

along

the

trip

shaft

for

a

mechanical

interference

or

connection

between

the

overcurrent

trip

device

and

the

trip

paddles

.

Remove

mechani

-

cal

connection

if

present

,

or

if

inter

-

ference

exists

,

use

extreme

care

when

removing

or

re

-

assembling

front

and

back

frames

to

avoid

mechanical

break

-

age

of

trip

devices

.

In

reassembling

the

front

and

rear

frames

,

the

two

frames

should

be

positioned

vertically

so

that

the

trip

shaft

is

horizontally

aligned

.

The

breaker

should

be

operated

several

times

at

rated

voltage

to

as

-

sure

that

the

control

circuits

are

properly

connected

and

that

all

elec

-

trical

attachments

are

functioning

properly

.

A

complete

contact

inspection

,

in

-

cluding

contact

wipe

and

pressure

,

should

be

made

at

regular

inspection

periods

and

always

after

a

known

short

circuit

current

has

been

interrupted

,

to

determine

whether

the

contacts

are

worn

or

pitted

in

which

case

they

should

be

dressed

or

replaced

.

It

is

necessary

to

remove

the

arc

quenchers

to

properly

inspect

the

contacts

.

Arcing

contacts

and

arc

quencher

barriers

should

be

replaced

when

they

are

eroded

to

half

their

original

thickness

.

At

regular

inspection

periods

the

breaker

should

be

operated

manually

;

(

stored

energy

mechanisms

with

the

safety

pin

restraining

the

closing

spring

force

)

to

observe

the

contact

alignment

and

to

make

sure

all

mecha

-

nism

parts

move

freely

without

binding

or

excessive

friction

.

If

the

breaker

remains

open

or

closed

for

a

period

of

six

months

or

more

,

it

is

recommended

that

arrange

-

ments

be

made

to

open

and

close

it

several

times

in

succession

,

prefer

-

ably

under

load

.

NOTE

:

It

is

recommended

that

the

breaker

be

fastened

to

a

suitable

mounting

base

with

the

front

frame

supported

by

a

sling

or

hook

as

the

bolts

are

LUBRICATION

If

overheating

,

not

caused

by

over

-

current

.

is

observed

,

a

comnletp

in

-

In

general

,

the

circuit

breaker

re

-

miirAfi

mnHprnt

*

*

lnhriratinn

R

^

arino

-

Courtesy of NationalSwitchgear.com

GE

/

-

74600

Low

-

voltag

*

Powmr

Circuit

Bnakws

TROUBLE

SHOOTING

\

CAUSE

TROUBLE

REMEDY

Contacts

not

aligned

.

Contacts

dirty

,

greasy

or

coated

with

dark

film

.

Contacts

badly

burned

or

pitted

.

Current

-

carrying

surfaces

dirty

.

Overheating

Adjust

contacts

.

Clean

contacts

.

Replace

contacts

.

Clean

surfaces

of

current

-

carrying

parts

.

Relocate

or

provide

adequate

enclo

-

sure

.

Corrosive

atmosphere

.

Insufficient

bus

or

*

cable

capacity

.

Increase

capacity

of

bus

or

cable

.

Bolts

and

nuts

at

terminal

connections

not

tight

.

Tighten

,

but

do

not

exceed

,

elastic

limit

of

bolts

or

fittings

.

Current

in

excess

of

breaker

rating

.

Check

breaker

application

or

modify

circuit

by

decreasing

load

.

Excessive

ambient

temperature

.

Provide

adequate

ventilation

.

Inductive

heating

.

Correct

bus

or

cable

arrangement

.

Travel

of

tripping

device

does

not

provide

positive

release

of

tripping

latch

.

Worn

or

damaged

trip

unit

parts

.

Binds

in

overcurrent

trip

device

.

Failure

to

Trip

Re

-

adjust

or

replace

tripping

device

.

Replace

trip

unit

.

Replace

overcurrent

trip

device

.

Check

application

of

overcurrent

trip

device

.

Check

application

of

overcurrent

trip

device

.

Replace

overcurrent

trip

device

.

Overcurrent

pick

up

too

low

.

False

Tripping

Overcurrent

time

setting

too

short

.

Bind

in

overcurrent

trip

device

.

Failure

to

Close

and

Latch

Re

-

align

and

adjust

attachments

.

Binding

in

attachments

preventing

resetting

of

latch

Latch

out

of

adjustment

.

Latch

return

spring

too

weak

or

broken

.

Adjust

latch

.

Replace

spring

.

Clean

bearing

and

latch

surfaces

.

Hardened

or

gummy

lubricant

.

Safety

pin

left

in

push

rod

.

Motor

burned

out

.

Remove

safety

pin

.

Replace

motor

.

Replace

or

adjust

faulty

device

.

Faulty

control

circuit

component

.

Burned

Main

Contacts

Improper

contact

sequence

(

main

contacts

not

sufficiently

parted

when

arcing

contacts

part

)

.

Increase

arcing

contact

wipe

.

Adjust

contact

sequence

by

raising

or

lowering

main

movable

contact

pivot

block

.

Short

-

circuit

current

level

above

interrupting

rating

of

breaker

.

Requires

system

study

and

possible

replacement

with

breaker

having

adequate

interrupting

capacity

.

Loss

of

contact

wipe

or

pressure

.

Replace

stationary

contact

springs

Courtesy of NationalSwitchgear.com

Low

-

voltage

Power

Circuit

Breakers

GEI

-

74600

f

BASIC

BREAKER

COMPONENTS

1

DISASSEMBLY

—

AK

AND

AKF

CENTER

POLE

(

Fig

.

4

)

REPLACEMENT

—

AKF

BREAKERS

ARC

QUENCHERS

(

Fig

*

4

and

5

)

The

center

-

pole

arc

quencher

of

these

breakers

is

similar

to

the

arc

The

following

instructions

apply

to

quenchers

of

the

standard

breakers

and

both

the

Type

AK

and

AKF

breaker

is

replaced

in

a

similar

manner

,

except

center

poles

,

that

the

breaker

must

be

closed

.

With

The

arc

quenchers

should

be

in

-

spected

at

the

regular

inspection

period

.

If

the

barriers

are

cracked

or

eroded

to

one

-

half

their

original

thickness

,

they

should

be

replaced

.

1

.

Remove

arc

quenchers

(

see

the

breaker

closed

the

center

-

pole

contacts

are

open

and

the

arc

quencher

REPLACEMENT

)

,

can

be

removed

.

r

REPLACEMENT

—

AK

BREAKERS

2

.

Remove

screws

holding

spacer

block

(

9

)

.

Replace

the

outer

-

pole

arc

quen

-

chers

of

the

Type

AKF

breaker

as

follows

;

1

.

Be

sure

the

breaker

is

open

.

3

.

Remove

spacer

block

,

steel

back

plate

(

8

)

,

and

compound

support

(

7

)

.

2

Remove

the

channel

-

shaped

re

-

taining

bar

by

removing

two

screws

and

two

nuts

.

4

.

Rock

muffler

(

6

)

slightly

and

re

-

move

.

The

inner

barriers

(

5

)

can

now

2

.

Remove

the

two

channel

-

shaped

be

removed

for

inspection

,

retaining

bars

which

bear

against

the

front

of

the

arc

quencher

by

removing

four

screws

,

two

on

each

side

.

1

.

Be

sure

the

breaker

is

open

.

3

.

Lift

the

quenchers

clear

of

the

movable

arcing

contacts

.

5

.

Remove

nut

and

withdraw

stud

(

1

)

.

6

.

Remove

cap

(

2

)

.

The

side

(

3

)

and

pocket

(

4

)

barriers

should

be

free

.

4

.

During

replacement

be

careful

not

to

overtighten

the

screws

which

se

-

cure

the

channel

-

shaped

retainingbar

.

Overtightening

the

screws

will

bow

the

bar

and

leave

the

center

arc

quen

-

cher

loose

.

3

.

Lift

the

arc

quenchers

clear

of

the

movable

arcing

contacts

.

7

.

Reassemble

and

replace

the

arc

quencher

in

the

reverse

order

.

Tighten

the

fastenings

after

replacement

.

4

.

Replace

arc

quenchers

and

in

-

sert

the

four

screws

holding

the

re

-

taining

bars

in

position

.

c

©

CO

©

CO

-

A

*

-

V

*

V

*

>

.

r

v

.

.

it

-

Y

~

.

»

i

.

I

2

3

4

5

6

7

9

8

?

.

Compound

Support

8

.

Steel

Back

Plate

9

.

Spacer

Block

4

.

Pocket

Barrier

5

.

Inner

Barrier

6

.

Muffler

1

.

Stud

2

.

Cap

3

.

Side

Barrier

W

Courtesy of NationalSwitchgear.com

G

£

1

-

74600

Low

-

voltage

Power

Circuit

Breakers

1

.

Muffler

A

ssembly

2

.

Spacer

Block

3

.

Inner

Barrier

4

.

Cap

5

.

Intermediate

Barrier

6

.

Outer

Barrier

7

.

Side

Plate

Disoisemb

/

ed

ore

quenene

AKF

oufer

pc

/

c

:

DISASSEMBLY

—

AKF

OUTER

POLES

(

Fig

.

5

)

Table

1

gives

the

figures

for

contact

pressure

and

contact

wipe

.

Both

wipe

and

pressure

should

be

checked

dur

-

ing

the

regular

inspection

period

.

MEASURING

CONTACT

WIPE

(

Fig

.

6

)

1

.

Remove

arc

quenchers

(

see

RE

-

PLACEMENT

under

ARC

QUEN

-

CHER

)

.

2

.

With

the

breaker

open

,

measure

the

horizontal

distance

from

the

edge

of

the

stationary

contact

to

the

sta

-

tionary

block

behind

it

.

(

"

B

"

dim

.

for

arcing

contacts

,

"

CM

dim

.

for

main

contacts

.

)

3

.

Close

the

breaker

and

repeat

item

2

.

The

difference

between

the

readings

in

items

2

and

3

determines

the

wipe

of

the

contacts

.

For

safety

reasons

be

extremely

careful

not

to

trip

the

breaker

.

MEASURING

CONTACT

PRESSURE

(

Fig

.

6

)

1

.

Remove

arc

quenchers

(

see

RE

-

PLACEMENT

under

ARC

QUEN

-

CHER

)

.

2

.

Close

the

breaker

and

measure

dimension

"

B

"

.

3

.

Open

the

breaker

.

Place

a

push

-

type

scale

against

the

stationary

arc

-

ing

contacts

at

a

point

measured

in

line

with

the

break

between

the

con

-

tact

stop

and

the

contact

pivot

block

.

Push

the

contact

backward

until

di

-

mension

MBH

recorded

in

item

2

is

reached

.

The

scale

should

then

be

read

.

4

.

If

the

pressure

is

not

within

the

requirements

listed

on

TABLE

I

,

re

-

fer

to

the

section

of

these

instructions

dealing

with

ADJUSTING

CONTACT

WIPE

AND

PRESSURE

.

travel

of

the

contacts

.

Flexible

braid

leads

(

5

)

shunt

the

pivot

pin

to

prevent

possible

pitting

at

the

pivot

point

when

interrupting

high

currents

.

On

later

model

breakers

shunting

springs

are

used

in

place

of

braids

.

The

movable

arcing

-

contact

assem

-

bly

consists

of

parallel

contact

arms

(

4

)

carried

on

two

movable

pivot

pins

(

8

)

and

(

19

)

.

The

arcing

contacts

in

-

terleave

the

main

contacts

and

pivot

with

them

about

pin

(

19

)

.

This

rela

-

tive

motion

is

obtained

by

linkages

from

the

upper

pin

(

7

)

to

the

breaker

mechanism

.

I

,

Remove

arc

quenchers

(

see

above

)

and

lay

on

sides

on

a

flat

sur

-

face

.

2

.

Remove

hardware

from

one

side

of

arc

quencher

as

indicated

in

Fig

.

5

.

3

.

Remove

bolt

fastening

cap

(

4

)

and

barrier

plate

assembly

.

i

4

.

Barrier

plates

may

now

be

lifted

from

assembly

for

inspection

.

5

.

In

reassembling

,

make

sure

components

are

positioned

so

that

holes

for

self

-

tapping

hardware

are

in

line

.

Do

not

strip

threads

in

compound

by

overstressing

screws

.

The

stationary

main

contact

assem

-

bly

includes

main

and

intermediate

contacts

.

The

inter

mediate

-

contact

surface

extends

beyond

the

main

con

-

tacts

and

will

,

therefore

,

make

before

the

main

contacts

and

break

after

the

main

contacts

.

The

number

of

con

-

tacts

for

each

breaker

rating

is

given

in

Table

I

,

The

movable

main

contacts

pivot

around

a

stationary

pin

(

18

)

,

which

holds

them

to

the

lower

block

.

Motion

is

obtained

from

a

second

pin

(

7

)

,

con

-

nected

by

an

insulated

link

(

12

)

to

the

breaker

mechanism

.

In

addition

to

flexible

braids

shunting

the

current

from

the

contact

directly

to

the

lower

contact

block

,

steel

springs

(

17

)

force

the

contacts

against

the

pins

to

pre

-

vent

pitting

at

the

pivot

point

.

The

movable

main

contact

assembly

also

contains

main

and

intermediate

con

-

tacts

.

POLE

UNIT

ASSEMBLY

(

Fig

*

6

)

NOTE

:

The

text

and

part

iden

-

tification

numbers

contained

in

this

section

apply

to

illustra

-

tions

covering

the

AK

-

50

breaker

.

The

same

text

is

ap

-

plicable

to

the

AK

-

75

and

100

breakers

by

referring

to

Fig

.

7

and

identifying

the

similar

parts

.

These

similar

parts

may

not

,

in

every

case

,

be

iden

-

tified

by

the

same

number

.

Each

pole

unit

assembly

consists

of

a

set

of

arcing

contacts

,

a

set

of

main

contacts

,

the

actuating

linkage

and

the

mounting

base

.

See

Fig

.

8

and

9

,

pole

unit

assemblies

mounted

on

back

frame

assemblies

.

The

stationary

arcing

-

contact

as

-

sembly

consists

of

a

set

of

parallel

contact

fingers

(

2

)

,

pin

(

3

)

,

and

com

-

pression

springs

(

22

)

,

which

provide

continuous

contact

pressure

for

the

full

In

order

to

function

properly

,

a

definite

amount

of

contact

pressure

and

contact

wipe

must

exist

between

the

movable

and

stationary

contacts

.

Courtesy of NationalSwitchgear.com

Low

-

voltage

Power

Circuit

Breakers

GCI

-

74600

TABLE

I

r

-

•

*

Intermediate

Contacts

Main

Contacts

Arcing

Contacts

Pres

-

sure

in

Lbs

.

Wipe

No

.

of

Contacts

Per

Pole

Pres

-

sure

in

Lbs

.

No

.

of

Contacts

Per

Pole

Pres

-

sure

in

Lbs

.

No

.

of

Contacts

Per

Pole

Wipe Wipe

Breaker

Type

in

in

in

Inches

Inches

Inches

1

/

16

to

16

/

64

to

23

/

64

55

to

65

AK

-

50

for

AC

3

55

to

65

I

2

31

to

43

*

3

/

32

1

/

16

to

16

/

64

to

23

/

64

AK

-

50

for

DC

55

to

65

3

31

to

43

3

55

to

65

1

3

/

32

r

1

/

16

to

16

/

64

to

23

/

64

AK

-

75

for

AC

35

to

45

1

35

to

45

3

31

to

43

5

*

3

/

32

1

/

16

to

16

/

64

to

23

/

64

AK

-

75

for

DC

5

35

to

45

1

35

to

45

5

31

to

43

*

3

/

32

1

/

16

to

16

/

64

to

23

/

64

AK

-

100

for

AC

AK

-

100

for

DC

25

to

35

2

25

to

35

5

*

8

31

to

43

3

/

32

16

/

64

to

23

/

64

1

/

16

to

55

to

65

1

55

to

65

2

AKF

-

1

C

(

Outside

Poles

)

3

*

31

to

43

3

/

32

AKF

-

lD

(

Outside

AKF

-

2

D

Poles

)

1

/

16

to

16

/

64

to

23

/

64

55

to

65

5

55

to

65

1

*

3

31

to

43

3

/

32

AKF

-

1

C

(

Field

AKF

-

ID

Discharge

Contacts

)

3

/

16

to

7

/

16

*

*

2

*

*

10

to

16

0

0

c

*

The

intermediate

contact

wipe

should

be

at

least

1

/

16

in

.

greater

than

main

contact

wipe

.

*

*

Left

stationary

contact

extends

approximately

3

/

32

in

.

±

1

/

32

further

than

right

hand

contact

.

least

3

/

16

in

.

,

the

main

contacts

gap

at

least

1

/

4

in

.

ADJUSTING

CONTACT

WIPE

AND

PRESSURE

(

Pig

.

6

)

NOTE

:

If

the

proper

contact

pressure

does

not

exist

when

the

contact

wipe

is

within

its

limits

,

the

stationary

contacts

springs

should

be

replaced

.

NOTE

:

This

check

can

best

be

made

by

means

of

the

mainte

-

nance

handle

,

with

the

safety

pin

restraining

the

closing

springs

.

1

.

To

obtain

proper

contact

wipe

and

pressure

on

the

center

pole

,

di

-

mension

"

A

”

should

be

increased

to

increase

wipe

and

decreased

to

de

-

crease

wipe

.

CONTACT

SEQUENCE

(

Pig

.

6

)

On

the

horizontal

plane

,

the

dif

-

ference

in

the

making

of

the

arcing

contacts

on

the

same

pole

must

be

no

greater

than

1

/

32

in

.

;

the

difference

between

arcing

contacts

on

separate

poles

1

/

16

in

.

If

it

is

desired

to

ad

-

vance

or

retard

the

closing

of

the

main

contacts

of

a

pole

,

loosen

the

bolts

holding

the

adjustment

plate

(

10

A

)

of

that

pole

and

slide

plate

to

the

left

to

advance

contact

closing

,

or

to

the

right

to

retard

contact

closing

.

Make

this

adjustment

on

the

outer

poles

,

us

-

ing

the

center

pole

as

a

reference

.

Upon

retightening

adjustment

plate

bolts

,

make

sure

the

locking

tabs

are

turned

up

around

bolt

heads

,

locking

the

bolts

securely

in

place

.

If

the

gap

is

under

the

required

mini

-

mum

,

it

is

usually

possible

to

form

the

arcing

contacts

and

obtain

the

re

-

quired

dimensions

.

To

form

the

con

-

tacts

,

place

apiece

of

conduit

approxi

-

mately

two

feet

long

,

over

the

contact

and

form

the

contact

either

forward

or

backward

.

If

the

proper

dimensions

are

still

not

obtained

the

movable

arc

-

ing

contacts

should

be

replaced

.

2

.

To

change

dimension

MA

”

re

-

move

the

clevis

pin

(

14

)

and

rotate

the

clevis

as

necessary

.

3

.

To

prevent

overstressing

the

clevis

threads

(

13

)

dimension

tTA

"

should

not

exceed

3

/

16

in

.

and

space

"

A

"

should

be

filled

with

shims

to

0.005

in

.

of

being

solid

.

4

,

With

the

proper

center

pole

wipe

obtained

,

moving

the

crossbar

adjust

-

ing

plate

(

10

A

)

on

the

center

pole

to

the

right

will

simultaneously

increase

the

wipe

on

both

outside

poles

;

moving

the

adjusting

plate

to

the

left

will

have

the

reverse

effect

.

If

it

has

been

necessary

to

make

any

adjustments

while

obtaining

proper

contact

sequence

,

the

contact

wipe

and

pressure

must

be

checked

,

and

adjusted

,

if

necessary

.

5

,

To

increase

the

wipe

on

either

outside

pole

individually

,

move

the

crossbar

adjusting

plate

of

that

pole

to

the

left

;

to

decrease

the

wipe

move

the

adjusting

plate

to

the

right

.

CONTACT

GAP

(

Fig

.

6

)

Contact

sequence

in

the

vertical

plane

should

be

such

that

when

the

arc

-

ing

contacts

are

just

touching

,

the

in

-

termediate

contact

gap

should

be

at

When

the

breaker

is

open

,

the

gap

between

the

movable

and

stationary

contacts

should

be

between

2

5

/

8

in

.

\

4

Courtesy of NationalSwitchgear.com

GE

/

-

74600

low

-

vo

/

foya

Power

Circuit

Broofrors

.

28

1

.

Screw

2

.

Stationary

Arcing

Contact

Pin

(

Stationary

Arcing

Contact

)

4

.

Movable

Arcing

Contact

5

.

Braid

5

A

.

Stationary

Intermediate

Contact

6

.

Movable

Main

Contact

7

.

Shouldered

Pin

Pin

(

Arcing

Contact

Link

)

Insulating

Link

Pin

(

Insulating

Link

)

10

A

,

Adjusting

Plate

11

.

Pin

(

Side

Link

)

11

A

.

Buffer

Spacers

12

.

Link

13

.

Clevis

14

.

Clevis

Pin

14

A

,

Opening

Spring

1

5

.

Lower

Stud

Pole

Unit

Base

17

.

Spring

(

Main

Movable

Contact

)

18

.

Pin

(

Movable

Main

Contact

)

19

.

Pin

(

Movable

Arcing

Contact

)

20

.

Side

Link

20

A

.

Contact

Stop

21

.

Spring

(

Stationary

Main

Contact

)

Spring

(

Stationary

Arcing

Con

-

tact

)

23

.

Upper

Stud

24

.

Pin

(

Stationary

Main

Contact

)

25

.

Stationary

Main

Contact

Screw

27

.

Screw

28

.

Stop

27

26

3

.

25

24

23

8

.

22

9

.

10

.

2

!

5

*

20

A

_

—

'

20

16

.

10

I

0

A

11

HA

12

13

22

.

14

I

4

A

26

.

)

Pole

unit

assembly

—

AK

-

50

Fig

.

6

.

and

2

3

/

4

in

.

The

gap

may

be

ad

-

justed

by

varying

the

number

of

buffer

spacers

(

11

A

)

on

the

cross

-

bar

.

The

locking

nuts

on

the

buffer

bolts

should

be

locked

in

such

a

position

that

the

buffer

bolt

may

be

rotated

freely

.

REPLACEMENT

OF

CONTACTS

(

Fig

.

6

)

Stationary

Arcing

Contacts

(

2

,

Fig

.

6

)

a

Fig

.

7

)

1

.

Remove

the

upper

plate

by

re

-

moving

two

screws

(

1

)

.

On

the

AK

-

75

and

-

100

remove

the

top

contact

block

(

25

,

Fig

.

7

)

and

remove

insulation

(

3

,

Fig

.

7

)

.

2

.

Remove

screws

from

shunting

braids

(

5

)

.

3

.

Remove

pin

(

3

)

freeing

the

sta

-

s

^

^

-

dtionary

contacts

and

springs

(

22

)

.

4

.

Install

new

springs

and

station

-

2

.

Remove

screws

(

27

)

and

remove

bracket

which

holds

pin

(

24

)

in

place

.

5

.

Adjust

contact

wipe

and

pres

-

(

See

ADJUSTING

CONTACT

sure

.

WIPE

AND

PRESSURE

.

)

3

.

Remove

main

-

and

intermediate

-

contact

stop

(

20

A

)

which

holds

the

lower

part

of

stationary

contact

.

Removal

will

be

facilitated

if

the

force

on

the

contact

springs

(

21

)

is

neutralized

.

This

can

be

accomplished

by

operat

-

ing

the

breaker

with

the

maintenance

handle

,

with

the

safety

pin

in

place

,

until

the

load

on

the

contact

stop

is

relieved

.

Movable

Arcing

Contacts

(

Fig

.

6

)

The

movable

arcing

contacts

(

4

)

should

be

replaced

when

the

stationary

arcing

contacts

are

replaced

.

1

.

Separate

the

front

frame

from

the

back

frame

as

described

under

SEPA

-

RATION

OF

FRONT

AND

REAR

FRAMES

.

4

.

Loosen

the

hardware

which

fastens

the

upper

stud

to

the

pole

unit

base

until

the

contact

-

spring

load

on

pin

(

24

)

is

relieved

.

5

.

Remove

pin

(

24

)

and

screws

(

26

)

and

lift

out

contacts

.

2

.

Remove

pins

(

8

)

and

(

19

)

and

withdraw

the

contacts

.

3

,

Reassemble

parts

in

reverse

order

.

Stationary

,

Intermediate

and

Main

Contacts

(

Fig

.

6

)

1

.

Remove

stationary

arcing

con

-

6

.

Reassemble

contacts

in

reverse

order

,

being

careful

to

replace

the

intermediate

contact

in

the

proper

£

4

i

-

i

_

Courtesy of NationalSwitchgear.com