Siemens SIRIUS 3RT Series System Manual page 18

Table of contents
8.9 Accessories ............................................................................................................................... 729
8.9.1 Accessories ............................................................................................................................... 729
8.9.2 Terminal support for stand-alone assembly.............................................................................. 729
8.9.2.1 Description ................................................................................................................................ 729
8.9.2.2 Mounting.................................................................................................................................... 730
8.9.3 Sealable cover .......................................................................................................................... 732
8.9.3.1 Description ................................................................................................................................ 732
8.9.3.2 Mounting.................................................................................................................................... 732
8.10 Technical data........................................................................................................................... 733
8.10.1 Performance features of current monitoring relays................................................................... 733
8.10.1.1 General data ............................................................................................................................. 733
8.10.1.2 Monitoring functions .................................................................................................................. 734
8.10.1.3 Equipment ................................................................................................................................. 735
8.10.1.4 Configuration of load feeders .................................................................................................... 736
8.10.1.5 Features of current monitoring relays ....................................................................................... 737
8.10.1.6 Combinations with 3RT20 contactor ......................................................................................... 737
8.10.2 3RR21 Basic analog setting current monitoring relay............................................................... 738
8.10.2.1 General technical data .............................................................................................................. 738
8.10.2.2 Main circuit ................................................................................................................................ 740
8.10.2.3 Connection for main circuit........................................................................................................ 741
8.10.2.4 Auxiliary circuit .......................................................................................................................... 742
8.10.2.5 Connecting the auxiliary circuit ................................................................................................. 743
8.10.2.6 Short-circuit protection .............................................................................................................. 743
8.10.3 3RR22 Standard digital setting current monitoring relay .......................................................... 744
8.10.3.1 General technical data .............................................................................................................. 744
8.10.3.2 Main circuit ................................................................................................................................ 746
8.10.3.3 Conductor cross-sections main circuit ...................................................................................... 747
8.10.3.4 Auxiliary circuit .......................................................................................................................... 748
8.10.3.5 Conductor cross sections, auxiliary circuit ................................................................................ 749
8.10.3.6 Short-circuit protection .............................................................................................................. 749
8.11 Dimension drawings (dimensions in mm) ................................................................................. 750
8.11.1 Dimension drawings for 3RR21 Basic analog setting current monitoring relay........................ 750
8.11.2 Dimension drawings for 3RR22 Standard digital setting current monitoring relay ................... 752
8.12 Circuit diagrams ........................................................................................................................ 754
A Appendix A ............................................................................................................................................ 757
A.1 Types of coordination................................................................................................................ 757
A.2 More information ....................................................................................................................... 758
A.3
Correction sheet........................................................................................................................ 759
Glossary ................................................................................................................................................ 761
Index...................................................................................................................................................... 775
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SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03