Siemens SIRIUS 3RF Series

System overview
1.7 Components and combinations
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
57
1.7.3 Monitoring
1.7.3.1 SIRIUS 3RR2 current monitoring relays
3RR2 current monitoring relays
Figure 1-25 S0 current monitoring relays
The SIRIUS 3RR2 current monitoring relays are ideally suited to a range of applications,
thanks to the flexible way in which they can be adjusted:
Table 1- 14 3RR2 current monitoring relays
Area Customer benefits
Functions
 Analog or digital setting
 Overcurrent and undercurrent monitoring
 Phase sequence, phase failure, and fault current monitoring
 Apparent or active current monitoring
 Freely parameterizable threshold values and delay times
 Manual and automatic reset
Dimensioning and
design
 S00, S0 (1.6 up to 40 A with only two versions)
 24 V AC/DC, 24 to 240 V AC/DC
 160 to 690 V wide voltage range in the main circuit
 45 mm width (40 A)
 1 CO contact and 1 semiconductor output
 Clear status signals on the display
 Screw-type and spring-loaded terminals
Mounting
advantages
 Removable terminals for auxiliary circuit wiring
 Direct mounting on contactor
 Same stand-alone mounting support as with overload relays
Application
areas/customer
benefits
 One device for overload and underload monitoring
 Integrated assembly:
– Reduced wiring
– No separate transformers required
– 3-phase current monitoring with further monitoring options
 Current monitoring relay for feeder-integrated load monitoring
 Detection of fast and substantial, as well as slight and "subtle" changes