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. 2508375983
Mfr. Part No.3UG4618-1CR20
BrandSiemens
£164.37
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RS Stock No. 2508375359
Mfr. Part No.3UG4511-1BN20
BrandSiemens
£74.23
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RS Stock No. 2508376071
Mfr. Part No.3UG4631-1AW30
BrandSiemens
£106.71
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RS Stock No. 2508118941
Mfr. Part No.3RS1020-1DW20
BrandSiemens
£178.29
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RS Stock No. 2508376065
Mfr. Part No.3UG4631-1AA30
BrandSiemens
£98.76
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RS Stock No. 2508828976
Mfr. Part No.1SVR430841R0500
BrandABB
£124.59
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RS Stock No. 2509815277
Mfr. Part No.RSB2A080P7S
£284.20
1 Box of 20
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RS Stock No. 2508120786
Mfr. Part No.3RS1140-1GD60
BrandSiemens
£214.08
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RS Stock No. 2550478367
Mfr. Part No.ABR7S23
£8.34
1 Pack of 4
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RS Stock No. 2509398246
Mfr. Part No.2885809
£111.92
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RS Stock No. 2508375416
Mfr. Part No.3UG4511-2BP20
BrandSiemens
£77.55
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RS Stock No. 2508279986
Mfr. Part No.3RN1013-2BW00
BrandSiemens
£149.79
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