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. 124-0185
Mfr. Part No.RM22TU21
MYR356.97
Each
units
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
MYR666.30
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 146-250
Mfr. Part No.RM17TG00
MYR512.56
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 397-9202
Mfr. Part No.45PUVR-4W 400VAC
MYR456.55
Each
units
Phase, Voltage - DPDT Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
RS Stock No. 876-5033
Mfr. Part No.1SVR730712R2200
BrandABB
MYR412.97
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
MYR371.17
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 397-9189
Mfr. Part No.70PCVR-4W 400VAC
MYR664.87
Each
units
Phase, Voltage - 4PDT Overvoltage, Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
MYR479.16
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 361-1619
Mfr. Part No.45051 24/115/230VAC
MYR503.93
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 Maximum of 230V ac - - - - 0.1 → 10s - - -
RS Stock No. 124-0190
Mfr. Part No.RM22UB34
MYR645.91
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 80 → 300V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 261-915
Mfr. Part No.84873022
BrandCrouzet
MYR479.16
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 124-0180
Mfr. Part No.RM22LA32MR
MYR533.89
Each
units
Level - DPDT - 1 - - - - - 0.1 → 30s - - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
MYR253.44
Each
units
Voltage - SPDT Undervoltage - 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
MYR2,076.46
Each
units
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 348-150
Mfr. Part No.FSST-110/230VAC
BrandTempatron
MYR475.40
Each
units
Speed - SPDT - - - - - - - - - - 50 → 60Hz
RS Stock No. 361-1625
Mfr. Part No.45UFR 230VAC
MYR519.53
Each
units
Frequency - DPDT - 1 - - - - - 200ms - - 40 → 60 Hz, 50 → 70Hz
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200
BrandABB
MYR730.66
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
MYR815.75
Each
units
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 857-7167
Mfr. Part No.DUA01CB23500V
MYR688.65
Each
units
Current, Voltage - SPDT Overvoltage 1 0.4 → 4 V ac, 2 → 20 V ac/dc, 20 → 200 V ac/dc, 5 → 50 V ac/dc, 50 → 500V ac/dc Overcurrent - - - - - - -
RS Stock No. 397-9173
Mfr. Part No.70PCVR 400VAC
MYR638.85
Each
units
Phase, Voltage - 4PDT Overvoltage, Undervoltage 3 Maximum of 400V ac - - - Phase Loss 200ms - - -