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
New
RS Stock No. 213-1313
Mfr. Part No.3UG4631-1AA30
BrandSiemens
TWD6,132.00
Each
units
Voltage - SPDT Overvoltage 1 - - - - - - - - -
RS Stock No. 857-7179
Mfr. Part No.DUB01CB23500V
TWD6,513.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 2 → 500V ac/dc - - - - 1 s, 6s - - -
New
RS Stock No. 209-8589
Mfr. Part No.DEB71DM24A5
TWD4,408.00
Each
units
Earth Leakage - SPDT - 1, 3 - - - - - - - - -
RS Stock No. 102-6133
BrandRS PRO
TWD3,161.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 0.1 → 30s - - 48 → 63Hz
RS Stock No. 876-5752
Mfr. Part No.1SVR740740R0100 CM-TCS.11P
BrandABB
TWD9,206.00
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 → +50°C 13.5 → 440Hz
RS Stock No. 876-5014
Mfr. Part No.1SVR730700R0200 CM-MSS.22S
BrandABB
TWD3,057.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -