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. 776-1581
Mfr. Part No.72.01.8.240.0000
BrandFinder
£63.64
Each
Units
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 789-2755
Mfr. Part No.70.61.8.400.0000
BrandFinder
£56.58
Each
Units
Voltage 208 → 480 V SPDT - 3 - - - - Phase Loss, Phase Sequence 0.5 s - - 50 → 60 Hz
RS Stock No. 789-2749
Mfr. Part No.70.11.8.230.2022
BrandFinder
£81.56
Each
Units
Voltage 220 → 240 V SPDT Overvoltage Protection, Undervoltage Protection 1 170 → 270 V ac - - - - 0.5 → 60 s - - 50 → 60 Hz
RS Stock No. 776-1594
Mfr. Part No.72.01.9.024.0000
BrandFinder
£63.64
Each
Units
Level 24 V dc SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 789-2746
Mfr. Part No.70.41.8.400.2030
BrandFinder
£99.25
Each
Units
Voltage 380 → 415 V SPDT Overvoltage, Undervoltage 3 300 → 480 V ac - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.5 → 60 s - - 50 → 60 Hz
RS Stock No. 789-2742
Mfr. Part No.70.31.8.400.2022
BrandFinder
£90.61
Each
Units
Voltage 380 → 415 V SPDT Overvoltage Protection, Undervoltage Protection 3 300 → 480 V ac - - - Phase Loss, Phase Sequence 0.5 → 60 s - - 50 → 60 Hz
RS Stock No. 776-1575
Mfr. Part No.72.01.8.024.0000
BrandFinder
£63.64
Each
Units
Level 24 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 788-8642
Mfr. Part No.72.42.0.024.0000
BrandFinder
£63.64
Each
Units
MultiFunction 24 V dc DPST - - - - - - - 0.2 → 20 s - - -
RS Stock No. 776-1585
Mfr. Part No.72.01.8.240.0002
BrandFinder
£63.64
Each
Units
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 776-1579
Mfr. Part No.72.01.8.024.0002
BrandFinder
£65.38
Each
Units
Level 24 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 788-8646
Mfr. Part No.72.42.0.230.0000
BrandFinder
£63.64
Each
Units
MultiFunction 110 → 240 V ac/dc DPST - - - - - - - 0.2 → 20 s - - -
RS Stock No. 776-1588
Mfr. Part No.72.01.8.125.0000
BrandFinder
£63.64
Each
Units
Level 110 → 125 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -