4.5.2 Auxiliary switch 37
4.5.3 Additional components 37
5 Notes on installation and use 38
5.1 General notes 38
5.1.1 Selection of protective devices 38
5.1.2 Use of residual current protective devices 40
5.2 Choosing the right residual current protective device 42
5.2.1 Type A, Type F or Type B/ Typ B+? 43
5.2.2 What protection goal must be achieved? 43
5.2.3 What electrical interference occurs and how is it handled? 44
5.2.3.1 Leakage currents 44
5.2.3.2 High load currents 45
5.2.3.3 Overvoltages and surge current load 46
5.3 Special features regarding the use of SIQUENCE universal
current-sensitive residual current protective devices
(Type B and Type B+) 47
5.3.1 Applications 47
5.3.2 Residual currents at different fault locations, with a frequency
converter (FC) as an example 47
5.3.3 Configuration 52
5.3.4 Causes of excessive leakage currents and possibilities of
reducing them 53
5.4 Back-up protection 55
5.5 Protection against thermal overload 57
5.6 Troubleshooting 58
5.7 4-pole residual current operated circuit breakers in a
3-pole network 59
6 Residual current monitoring devices (RCM) 59
7 Outlook 61
8 Source specified 62
9 Appendix 63
10 List of figures and tables 74
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