SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RR21, 3RR22 Monitoring Relays for Mounting onto 3RT2 Contactors
Current and active current monitoring
10
Possible combinations of 3RR21/3RR22 monitoring relays with 3RT2 contactors
✓
Available
Features
3RR21
3RR22
Benefits
Design of load feeders
Short-circuit strength up to 100 kA
at 690 V
(in conjunction with the corresponding
fuses or the corresponding motor starter
protector)
✓
✓
• Provides optimum protection of the loads and
operating personnel in the event of short circuits due
to insulation faults or faulty switching operations
Electrical and mechanical
matching to 3RT2 contactors
✓
✓
• Simplifies configuration
• Reduces wiring outlay and costs
• Enables stand-alone installation as well as
space-saving direct mounting
Spring-type terminals for main circuit
(with S00, S0) and auxiliary circuits
✓
(optional)
✓
(optional)
• Enables fast connections
• Permits vibration-resistant connections
• Enables maintenance-free connections
Other features
Suitable for single and three-phase loads
✓
✓
• Enables the monitoring of single-phase systems
through parallel infeed at the contactor or looping the
current through the three phase connections
Wide setting ranges
✓
✓
• Reduce the number of variants
• Minimize the configuration outlay and costs
• Minimize storage overheads, storage costs, tied-up
capital
Wide-voltage supply range
✓
(optional)
✓
(optional)
• Reduces the number of versions
• Minimizes the configuring overhead and costs
• Minimizes storage overhead, storage costs, tied-up
capital
Monitoring relays
Current range
Contactors
(type, size, rating)
3RT201
3RT202
3RT203
S00
S0
S2
Type
A
3/4/5.5/7.5 kW
5.5/7.5/11/15/18.5 kW
18.5/22/30/37 kW
3RR2.41
3RR2141
1.6 ... 16
✓
With stand-alone installation support
With stand-alone installation support
3RR2241
1.6 ... 16
✓
With stand-alone installation support
With stand-alone installation support
3RR2.42
3RR2142
4 ... 40
With stand-alone installation support
✓
With stand-alone installation support
3RR2242
4 ... 40
With stand-alone installation support
✓
With stand-alone installation support
3RR2.43
3RR2143
8 ... 80
With stand-alone installation support
With stand-alone installation support
✓
3RR2243
8 ... 80
With stand-alone installation support
With stand-alone installation support
✓
© Siemens AG 2016