Siemens SIRIUS 3RU - Page 6

Table of contents
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
6 Manual, 09/2016, A5E03656507420A/RS-AB/003
5.2 Ground-fault protection in the case of 3RB21 / 3RB31 ......................................................... 54
5.3 Auxiliary contacts ................................................................................................................... 55
5.4 Indication of the operating state ............................................................................................. 56
5.5 Self-monitoring (3RB20 / 3RB21 and 3RB30 / 3RB31 only) ................................................. 56
5.6 Additional functions ................................................................................................................ 57
6 Configuration ........................................................................................................................................ 59
6.1 SIRIUS system configurator ................................................................................................... 59
6.2 Overload relays in motor feeders ........................................................................................... 60
6.2.1 Motor protection with overload relay ...................................................................................... 60
6.2.2 Overview of combinable 3RT contactors ............................................................................... 61
6.2.3 Normal and heavy-duty starting ............................................................................................. 62
6.2.4 Contactor assembly for star-delta (wye-delta) start ............................................................... 63
6.2.5 Operation with frequency converters ..................................................................................... 64
6.3 Short-circuit protection ........................................................................................................... 65
6.4 Protecting explosion-protected motors .................................................................................. 66
6.5 Safety instructions for use in hazardous areas (3RB) ........................................................... 67
6.5.1 General information ............................................................................................................... 67
6.5.2 Installation and commissioning .............................................................................................. 69
6.5.3 Safety data ............................................................................................................................. 74
6.5.4 Maintenance and repair ......................................................................................................... 75
6.5.5 Warranty ................................................................................................................................. 75
6.5.6 Further information ................................................................................................................. 75
6.6 Application environment ......................................................................................................... 76
7 Mounting ............................................................................................................................................... 81
7.1 Mounting options .................................................................................................................... 81
7.2 Minimum clearances and mounting position .......................................................................... 82
7.3 Mounting/Disassembly ........................................................................................................... 83
7.3.1 Thermal and electronic overload relays (S00 / S0) ................................................................ 83
7.3.2 Thermal and electronic overload relays (S2 / S3) .................................................................. 88
7.3.3 Electronic overload relays (S6) .............................................................................................. 90
7.3.4 Solid state overload relays (S10 / S12) ................................................................................. 95
8 Connection ........................................................................................................................................... 99
8.1 Connection ............................................................................................................................. 99
8.2 Connection of 3RU21 overload relay ................................................................................... 102
8.3 Connection of 3RB20 / 3RB21 and 3RB30 / 3RB31 overload relays .................................. 102
8.4 Connection cross-sections ................................................................................................... 103
8.4.1 Conductor cross-sections for screw-type connection systems ............................................ 103
8.4.2 Conductor cross-sections for spring-loaded connection systems ....................................... 110
8.4.3 Conductor cross-sections for ring cable lug connection system .......................................... 112