Monitoring; Sirius 3Rr2 Current Monitoring Relays - Siemens SIRIUS 3RT Series System Manual

1.7.3

Monitoring

1.7.3.1

SIRIUS 3RR2 current monitoring relays

3RR2 current monitoring relays
Figure 1-25
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
Area
Functions
Dimensioning and
design
Mounting
advantages
Application
areas/customer
benefits
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
S0 current monitoring relays
3RR2 current monitoring relays
Customer benefits
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

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

Removable terminals for auxiliary circuit wiring

Direct mounting on contactor

Same stand-alone mounting support as with overload relays

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

System overview
1.7 Components and combinations
57