Siemens SENTRON Bedienungsanleitung

SENTRON

www.siemens.com/rccb

Residual current

protective devices

Technology primer

Edition 06/2018

Be it protecting, switching, measuring or monitoring – components for

low-voltage power distribution from Siemens offer just the right device

for all applications in the electrical installation ﬁeld. Whether for use in

industry, infrastructure or buildings, these products guarantee a maximum of

ﬂexibility, ease of use and safety.

So you can keep the entire power supply safely under control.

This is especially important when it comes to selecting and installing the

appropriate residual current protective device. With this primer, we provide

you with a simple tool for perfectly adapting the respective residual current

circuit breaker to the requirements of the electrical installation in question.

Apart from general information on residual current protective devices, it

contains important details regarding installation and use. You are therefore

sure of always selecting the right device.

Preface

1. Product portfolio 6

2. Introduction 8

3. Protection through residual current protective devices 9

3.1 Additional protection with In ≤ 30 mA

(previously “Protection against direct contact”) 9

3.2 Fault protection (previously “Protection against indirect contact”) 13

3.3 Fire protection 14

4. Residual current protective devices 15

4.1 Types of RCCBs 15

4.1.1 Type AC 17

4.1.2 Type A 17

4.1.3 Type F 17

4.1.4 Type B 17

4.1.5 Type B+ 18

4.2 Classiﬁcation of residual current protective devices 18

4.3 Basic design and method of operation 21

4.3.1 Type A RCCB 21

4.3.2 SIQUENCE universal current-sensitive RCCB Type B and Type B+ 24

4.4 Features and application areas 25

4.4.1 RCCB 25

4.4.2 RCBO Type AC, Type A and Type F 26

4.4.3 SIQUENCE universal current-sensitive RCCB Type B and Type B+ 29

4.4.4 SIQUENCE universal current-sensitive RCBO Type B and Type B+ 34

4.4.5 RC units for installation on miniature circuit breakers 35

4.4.6 SIGRES RCCBs (for harsh ambient conditions) 36

4.4.7 Type

Ksuper-resistant 37

4.4.8 Type

Sselective 39

4.4.9 Versions for 50 to 400 Hz 40

4.4.10 Versions for 500 V operational voltage 40

4.4.11 RCCB with left-side N connection 40

4.5 Additional components for RCCBs 41

4.5.1 Remotely controlled mechanism (RC) 41

4.5.2 Auxiliary switches 43

4.5.3 Additional components 43

Contents

5. Notes on installation and use 44

5.1 General notes 44

5.1.1 Selection of protective devices 44

5.1.2 Use of residual current protective devices 46

5.2 Choosing the right residual current protective device 48

5.2.1 Type A, Type F or Type B / Type B+? 49

5.2.2 What protection goal must be achieved? 49

5.2.3 What electrical interference occurs and how is it handled? 50

5.3 Special features regarding the use of SIQUENCE universal current-sensitive

RCCBs (Type B and Type B+) 53

5.3.1 Applications 53

5.3.2 Residual currents at various fault locations, with a frequency

converter (FC) as an example 54

5.3.3 Conﬁguration 61

5.3.4 Causes of excessive leakage currents and possibilities of reducing

them 62

5.4 Back-up protection 64

5.5 Protection against thermal overload 66

5.6 Troubleshooting 67

5.7 4-pole RCCBs in a 3-pole network 68

6. MRCDs and RCMs 69

6.1 Modular residual current devices (MRCDs) 69

6.2 Residual current monitoring devices (RCMs) 70

7. Outlook 73

8. Sources 74

9. Appendix 75

9.1 Key terms and deﬁnitions (according to DIN VDE 0100-200) 75

9.2 Power systems and protective devices 78

9.2.1 TN system 79

9.2.2 TT system 80

9.2.3 IT system 82

9.2.4 Summary 83

9.3 Key terms and deﬁnitions for specifying the switching capacity 84

9.4 Installation regulations for electrical installations with residual current

protective devices 85

10. List of ﬁgures and tables 87

Product portfolio

1. Product portfolio

Residual current circuit breaker

(RCCB) 5SM3 / 5SV

• Type AC, Type A and Type F

• In= 16 … 125 A

• In = 10 mA … 1 A

• 2-pole (1+N) and 4-pole (3+N)

• N connection at left and right

• SIGRES version for harsh ambient

conditions

• Version Kand S

• Version for 500 V

• Version for 50 … 400 Hz

SIQUENCE residual current circuit

breaker (RCCB) 5SM3/5SV3

• Type B, Type B+

• In= 16 … 80 A

• In = 30, 300 and 500 mA

• 2-pole (1+N) and 4-pole (3+N)

• Version Kand S

• including SIGRES functionality

SIQUENCE residual current breaker

with overcurrent protection (RCBO) 5SU1

• Type B, Type B+

• In= 100 … 125 A

• In = 30, 300 mA and 1 A

• 4-pole

• Circuit breaker characteristic

C and D

• Rated switching capacity 10 kA

• Version Kand S

RC unit for combination with a

miniature circuit breaker 5SM2

• For mounting on a miniature

circuit breaker

• Combined electric shock and line

protection

• Type AC, Type A and Type F

• In= 0.3 … 100 A

• In = 10 mA … 1 A

• 2-, 3- and 4-pole

• Version Kand S

RCBOs;

combination units 5SU1

• Combined electric shock and line

protection

• Type AC, Type A and Type F

• In= 6 … 40 A

• In = 10 … 300 mA

• Circuit breaker characteristic B and C

• Rated switching capacity 4.5 kA,

6 kA and 10 kA

• 1+N-pole, 2-pole

• N connection at right and left

Residual current monitoring

devices (RCM) 5SV8

• Residual current monitoring

• Type AC and Type A

• In = 0.03 ... 30 A

• Response time 0.02 ... 10 s

• Summation current transformer

20 ... 210 mm

Introduction

2. Introduction

When dealing with electricity, safety has top priority. Every electrician must be

particularly conscientious when safety is concerned and must apply the required

protective measures correctly. In consumer’s installations, residual current

protective devices must be given unreserved preference over alternative protective

devices.

In addition to fault protection (protection against indirect contact), RCCBs with

rated residual currents up to 30 mA also provide “additional protection” in cases

of direct contact. Fires caused by ground-fault currents can also be prevented at a

very early stage.

In many cases, the DIN VDE standards require the use of residual current protective

devices. Electricians should therefore make sure that they are fully informed about

RCCBs. In addition to information on the protective effect, an understanding of

how the devices function is also conveyed.

In order to optimally adapt the use of the devices to the requirements of the

electrical installation, the functionality of the different versions of RCCBs is

discussed and the user is given practical installation and application tips.

3. Protection through residual current protective devices

The basic prerequisite for use of a residual current protective device in order

to “automatically disconnect the power supply” as a protective measure is that

an appropriately grounded protective conductor is connected to the system

components and equipment to be protected. Current can then pass through

a human body only when two faults occur (interruption of the PE conductor

in addition to a fault in the insulation) or when there is unintentional contact

between live parts.

3.1 Additional protection with IΔn ≤ 30 mA

(previously “Protection against direct contact”)

Additional protection is understood to mean protection which takes effect if there

is direct contact of a human body with a part normally live during operation in the

event of basic and/or fault protection failing. If a person directly touches live parts,

two series-connected resistors determine the level of the current – the internal

resistance of the person Rmand the transfer resistance of the location Rst; see

Fig. 1.

Protection through residual current protective devices

Direct contact

IΔn≤30mA

RBRst



Fig. 1: Protection against direct contact: Additional protection means measures

to protect against direct contact with an active part that is energized

during operation.

For a proper assessment of the accident risk, it must be assumed that the contact

resistance of the location is virtually zero.

The resistance of the human body depends on the current path and the contact

resistance of the skin. Measurements have shown, for example, that a current

path of hand/hand or hand/foot has a resistance of approx. 1000 . Under these

assumptions, a touch voltage of 230 V would produce a dangerous shock current

of 230 mA. Fig. 2 shows the current intensity/exposure time curves in relation to

the physiological reactions of the human body. Dangerous current intensities and

exposure times are those which reach as far as zone , as they can cause death

due to ventricular ﬁbrillation. It also shows the tripping ranges of the residual

current protective devices with rated residual currents of 10 mA and 30 mA. The

maximum permissible tripping times according to VDE 0664-10 are also depicted.

As can be seen from the tripping curves, residual current protective devices do

not limit the intensity of the residual current but provide protection due to fast

disconnection of the power and therefore a minimal time of exposure to the

current.

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