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. 123-9725
Mfr. Part No.V2PF480Y/277VSY01
BrandTele
TWD2,338.00
Each
units
Phase 120 → 208 V ac, 277 → 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence 250 ms - - -
RS Stock No. 123-9750
Mfr. Part No.G2PM400VSY20 24-240VAC/DC
BrandTele
TWD3,524.00
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. 123-9726
Mfr. Part No.V4PF480Y/277VSYTK02
BrandTele
TWD3,783.00
Each
units
Phase, Temperature 120 → 208 V ac, 277 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 250 (Tripping) ms, 500 (Start Up) ms Overtemperature - -
RS Stock No. 730-0495
Mfr. Part No.E3TF01 230V AC
BrandTele
TWD3,786.00
Each
units
Temperature 230 V ac SPDT - - - - - - - 250 ms Winding Temperature - -
RS Stock No. 730-0499
Mfr. Part No.E1UU230V01
BrandTele
TWD3,288.00
Each
units
Voltage 24 V ac/dc, 230 V ac SPDT Undervoltage - Maximum of 24 V ac/dc - - - - 500 ms - - -
RS Stock No. 123-9751
Mfr. Part No.G2PM115VSY20 24-240V AC/DC
BrandTele
TWD6,925.00
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
TWD5,315.00
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent - 100A - 0.1 → 10 s, 200 ms - - -
RS Stock No. 123-9752
Mfr. Part No.G2PM230VSY20 24-240V
BrandTele
TWD7,985.00
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. 123-9720
Mfr. Part No.E3LM10 230V AC
BrandTele
TWD3,677.00
Each
units
Liquid Level 230 V ac SPDT - 1 - - - - - 0.5 → 10 s - - -
RS Stock No. 123-9715
Mfr. Part No.E1IM10AACL10 230V AC
BrandTele
TWD5,803.00
Each
units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent - 10 (Input) A, 13 (Over Load) A - 0.1 → 10 s - - -
RS Stock No. 182-9995
Mfr. Part No.G2PU690VS20
BrandTele
TWD5,957.00
Each
units
Voltage 250 V ac DPDT - 3 - - - - - 10 ms - - 20 → 70 Hz
RS Stock No. 123-9721
Mfr. Part No.V2TF01
BrandTele
TWD1,998.00
Each
units
Temperature 24 → 240 V ac/dc SPST - 1 - - - - - 50 ms Overtemperature - -
RS Stock No. 123-9732
Mfr. Part No.K3PF400VSY02
BrandTele
TWD3,714.00
Each
units
Phase, Voltage 230 → 400 V DPDT Self Powered 3 230 → 400 V - - - Phase Failure, Phase Sequence 100 ms - - -
RS Stock No. 123-9722
Mfr. Part No.V2UM230V10
BrandTele
TWD3,527.00
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 - - - - 0.1 → 10 s, 300 ms - - -
RS Stock No. 123-9713
Mfr. Part No.E1PF400VSY01
BrandTele
TWD1,336.00
Each
units
Phase, Voltage 230 → 400 V SPDT Self Powered 3 230 → 400 V - - - Phase Failure, Phase Sequence 100 ms - - -
RS Stock No. 182-9993
Mfr. Part No.E1YF400V01 0.85
BrandTele
TWD3,407.00
Each
units
Voltage 400/230 V ac SPDT - 3 - - - - - 200 ms - - 48 → 63 Hz
RS Stock No. 123-9747
Mfr. Part No.G2UM300VL20 24-240VAC/DC
BrandTele
TWD6,658.00
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage 1 30 → 300 V ac/dc - - - - 0 → 10 (Start Up) s, 0.1 → 10 (Tripping) s - - -
RS Stock No. 123-9767
Mfr. Part No.G4CM690V16ATL20
BrandTele
TWD12,761.00
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. 123-9733
Mfr. Part No.K3YM400VSY20
BrandTele
TWD6,292.00
Each
units
Phase, Voltage 230 → 400 V DPDT - 1, 3 230 → 400 V - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 123-9730
Mfr. Part No.K3UM230VAC02
BrandTele
TWD6,185.00
Each
units
Voltage 230 V ac DPDT Undervoltage 1 Maximum of 230 V ac - - - - - - - -