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. 123-9717
Mfr. Part No.E1YM400VS10
BrandTele
£95.81
Each
Units
Phase, Voltage 230 400 V SPDT Undervoltage 1, 3 230 400 V - - - Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 123-9742
Mfr. Part No.G2PF400VS02
BrandTele
£47.02
Each
Units
Phase, Voltage 230 400 V DPDT Self Powered 3 230 400 V - - - Phase Failure, Phase Sequence 350 (Tripping) ms, 500 (Start Up) ms - - -
RS Stock No. 123-9750
Mfr. Part No.G2PM400VSY20 24-240VAC/DC
BrandTele
£140.89
Each
Units
Phase, Voltage 12 400 V ac, 24 V dc DPDT Undervoltage 3 230 400 V - - - Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 123-9722
Mfr. Part No.V2UM230V10
BrandTele
£62.99
Each
Units
Voltage 24 V dc, 230 V ac/dc SPDT Overvoltage, Undervoltage 1 Maximum of 230 V ac/dc, Maximum of 24 V dc - - - - 300 ms, 0.1 10 s - - -
RS Stock No. 123-9744
Mfr. Part No.G2TFKN02 24-240VAC/DC
BrandTele
£129.99
Each
Units
Temperature 24 240 V ac/dc DPDT - 1 - - - - - - - - -
RS Stock No. 123-9720
Mfr. Part No.E3LM10 230V AC
BrandTele
£77.24
Each
Units
Liquid Level 230 V ac SPDT - 1 - - - - - 0.5 10 s - - -
RS Stock No. 123-9713
Mfr. Part No.E1PF400VSY01
BrandTele
£50.62
Each
Units
Phase, Voltage 230 400 V SPDT Self Powered 3 230 400 V - - - Phase Failure, Phase Sequence 100 ms - - -
RS Stock No. 123-9751
Mfr. Part No.G2PM115VSY20 24-240V AC/DC
BrandTele
£145.50
Each
Units
Phase, Voltage 12 400 V ac, 24 V dc DPDT Undervoltage 3 66 115 V - - - Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 123-9727
Mfr. Part No.V4IM100AL20 24-240V AC/DC
BrandTele
£111.67
Each
Units
Current 24 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent - 100A - 0.1 10 s, 200 ms - - -
RS Stock No. 123-9767
Mfr. Part No.G4CM690V16ATL20
BrandTele
£268.12
Each
Units
Power, Temperature 12 500 V ac DPDT - 1, 3 3 690 V - 8A 16A - 1 50 (Tripping) s, 3 180 (Start Up) s - - -
RS Stock No. 123-9716
Mfr. Part No.E1UM230V01
BrandTele
£148.23
Each
Units
Voltage 24 230 V ac SPDT Self Powered 1 24 230 V ac - - - - 500 (Reset) ms - - -
RS Stock No. 123-9745
Mfr. Part No.G2LM20 230VAC
BrandTele
£75.34
Each
Units
Liquid Level 230 V ac DPDT - 1 - - - - - 0.5 10 s - - -
RS Stock No. 123-9724
Mfr. Part No.V2PM400Y/230VS10
BrandTele
£87.53
Each
Units
Phase 230 400 V ac SPDT - 1, 3 - - - - Phase Loss, Phase Sequence 0.1 10 s, 200 ms - - -
RS Stock No. 123-9743
Mfr. Part No.G2TF02 24-240VAC/DC
BrandTele
£80.40
Each
Units
Temperature 24 240 V ac/dc DPDT - 1 - - - - - - - - -
RS Stock No. 123-9728
Mfr. Part No.V4IM35AL20 24-240V AC/DC
BrandTele
£111.67
Each
Units
Current 24 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent - 35A - 0.1 10 s - - -
RS Stock No. 123-9746
Mfr. Part No.G2LM20 110VAC
BrandTele
£42.72
Each
Units
Liquid Level 110 V ac DPDT - 1 - - - - - 0.5 10 s - - -
RS Stock No. 730-0499
Mfr. Part No.E1UU230V01
BrandTele
£69.09
Each
Units
Voltage 24 V ac/dc, 230 V ac SPDT Undervoltage - Maximum of 24 V ac/dc - - - - 500 ms - - -
RS Stock No. 123-9752
Mfr. Part No.G2PM230VSY20 24-240V
BrandTele
£106.76
Each
Units
Phase, Voltage 12 400 V ac, 24 V dc DPDT Undervoltage 3 132 230 V - - - Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 730-0495
Mfr. Part No.E3TF01 230V AC
BrandTele
£32.80
Each
Units
Temperature 230 V ac SPDT - - - - - - - 250 ms Winding Temperature - -
RS Stock No. 123-9730
Mfr. Part No.K3UM230VAC02
BrandTele
£66.63
Each
Units
Voltage 230 V ac DPDT Undervoltage 1 Maximum of 230 V ac - - - - - - - -