Siemens SIRIUS 3RH Series - Features of Current Monitoring Relays; Combinations with 3 RT20 Contactor

SIRIUS 3RR2 current monitoring relays
8.10 Technical data
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
737
8.10.1.5 Features of current monitoring relays
Feature Benefit 3RR21 Basic, analog
setting
3RR22 Standard, digital
setting
Suitable for single- and three-
phase loads
 Enables even single-phase
systems to be monitored
 By means of parallel
infeed in the contactor
 Or looping the current
through the three phase
inputs
✓ ✓
Wide setting ranges
 Reduce the number of
variants
 Minimize the engineering
outlay and costs
 Enable savings to be
made where storage
overheads, storage costs,
and tied-up capital are
concerned
✓ ✓
Wide-range power supply
 Reduce the number of
variants
 Minimize the engineering
outlay and costs
 Enable savings to be
made where storage
overheads, storage costs,
and tied-up capital are
concerned
✓ (optional) ✓ (optional)
8.10.1.6 Combinations with 3RT20 contactor
Monitoring relay
type
Current range 3RT20 1 S00 contactors
3/4/5.5/7.5 kW
3RT20 2 S0 contactors
5.5/7.5/11/15/18.5 kW
3RR21 41 1.6 to 16 A ✓ (with stand-alone assembly support)
3RR22 41 1.6 to 16 A ✓ (with stand-alone assembly support)
3RR21 42 4.0 to 40 A (with stand-alone assembly support) ✓
3RR22 42 4.0 to 40 A (with stand-alone assembly support) ✓