Monitoring Relays

Monitoring relays are a type of relay that trips a circuit breaker when a fault is detected. A relay is an electrically controlled switch that is used to turn the power on or off in a circuit. 


Monitoring relays are more sophisticated than regular relays, as they have adjustable operating conditions, whereas normal relays switch according to a fixed threshold. They measure a given parameter, such as voltage or temperature, and will trip a circuit breaker when the parameter gets too high or low. 


What are monitoring relays used for?

Monitoring relays have a wide range of uses, depending largely on the factor being monitored. For example, they can protect against overcurrent if measuring current, or they can detect an abnormally low frequency if frequency is being measured.


Types of monitoring relay

The main way in which monitoring relays differ is the function that they measure. This can be a number of things, including:

  • voltage
  • current
  • temperature
  • frequency

The factor that you need to measure will decide which monitoring relay you choose.


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Description Price Monitoring Application Supply Voltage Contact Configuration Voltage Sensitivity Electrical Phase Voltage Sensing Range Current Sensitivity Minimum Current Sensed Maximum Current Sensed Phase Sensitivity Time Delay Temperature Sensitivity Temperature Sensing Range Frequency Sensing Range
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100
BrandABB
kr 2 359,90
Each
Units
Insulation 24 240 V ac/dc SPDT - - 0 250 V ac, 0 300 V dc - - - - - - - -
RS Stock No. 806-5935
Mfr. Part No.1SVR740660R0100
BrandABB
kr 2 431,68
Each
Units
Insulation 24 → 240 V ac/dc DPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 876-4989
Mfr. Part No.1SVR740720R1400
BrandABB
kr 1 013,95
Each
Units
Temperature 24 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
kr 533,89
Each
Units
Temperature 110 130 V ac, 220 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300
BrandABB
kr 2 539,36
Each
Units
Phase, Voltage 450 720 V ac DPDT Overvoltage, Undervoltage 3 450 720 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 30 s - - 45 65 Hz
RS Stock No. 775-8006
Mfr. Part No.1SVR730841R1300
BrandABB
kr 1 525,41
Each
Units
Current 220 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS Stock No. 876-5761
Mfr. Part No.CM-TCS.12S
BrandABB
kr 1 965,09
Each
Units
Temperature 24 240 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 +100°C 13.5 440 Hz
RS Stock No. 876-5764
Mfr. Part No.CM-TCS.12P
BrandABB
kr 2 018,93
Each
Units
Temperature 24 240 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 +100°C 13.5 440 Hz
RS Stock No. 775-7930
Mfr. Part No.1SVR730750R0400
BrandABB
kr 2 108,66
Each
Units
Voltage 24 240 V ac/dc DPDT Overvoltage, Undervoltage 1 3 30 V, 6 60 V, 30 300 V, 60 600 V - - - - 0 s, 0.1 30 s - - -
RS Stock No. 775-8015
Mfr. Part No.1SVR730841R1400
BrandABB
kr 1 651,03
Each
Units
Current 220 240 V ac DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 30 s - - 50 60 Hz
RS Stock No. 876-5799
Mfr. Part No.CM-TCS.23P
BrandABB
kr 1 660,01
Each
Units
Temperature 24 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 +200°C 45 65 Hz
RS Stock No. 876-5768
Mfr. Part No.1SVR730740R0300
BrandABB
kr 1 965,09
Each
Units
Temperature 24 240 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 +200°C 13.5 440 Hz
RS Stock No. 876-5014
Mfr. Part No.1SVR730700R0200
BrandABB
kr 690,92
Each
Units
Temperature 24 V ac/dc DPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7964
Mfr. Part No.1SVR730831R1300
BrandABB
kr 1 525,41
Each
Units
Voltage 220 240 V ac SPDT Overvoltage, Undervoltage 1 3 30 V, 6 60 V, 30 300 V, 60 600 V - - - - - - - -
RS Stock No. 876-4998
Mfr. Part No.1SVR730700R0100
BrandABB
kr 533,89
Each
Units
Temperature 24 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5027
Mfr. Part No.1SVR740712R1400
BrandABB
kr 1 283,14
Each
Units
Temperature 24 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5042
Mfr. Part No.1SVR740712R2200
BrandABB
kr 798,60
Each
Units
Temperature 110 130 V ac, 220 240 V ac DPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5770
Mfr. Part No.CM-TCS.21S
BrandABB
kr 1 615,14
Each
Units
Temperature 24 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 +50°C 45 65 Hz
RS Stock No. 775-8043
Mfr. Part No.1SVR740794R3300
BrandABB
kr 1 884,33
Each
Units
Phase, Voltage 300 500 V ac DPDT Overvoltage, Undervoltage 3 300 500 V ac - - - Phase Failure, Phase Sequence 0 s, 0.1 30 s - - 45 65 Hz
RS Stock No. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
kr 650,54
Each
Units
Phase 380 440 V ac SPST - 1, 3 - - - - Phase Failure 150 ms - - -