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. 111-3113
Mfr. Part No.K8DT-VS3TA
BrandOmron
MYR566.12
Each
units
Voltage - - Overvoltage, Undervoltage 1 - - - - - 250ms - - -
RS Stock No. 794-3957
Mfr. Part No.MJ83BK
BrandGIC
MYR241.35
Each
units
Thermistor - DPDT - 1 - - - 6A - 100 ms, 500ms - - -
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300
BrandABB
MYR1,755.18
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 450 → 720V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 876-2551
Mfr. Part No.1SVR560730R3402
BrandABB
MYR3,794.89
Each
units
Frequency, Voltage - SPDT Overvoltage, Undervoltage 1, 3 - - - - - ±20ms - - 40 → 70Hz
RS Stock No. 916-0114
Mfr. Part No.PMV50A575
BrandLovato
MYR998.38
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
MYR520.70
Each
units
Level Control - SPDT - - - - - - - - - - -
RS Stock No. 111-3116
Mfr. Part No.K8DT-VW2CD
BrandOmron
MYR624.07
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 250ms - - -
RS Stock No. 123-9732
Mfr. Part No.K3PF400VSY02
BrandTele
MYR548.37
Each
units
Phase, Voltage - DPDT Self Powered 3 - - - - Phase Failure, Phase Sequence 100ms - - -
RS Stock No. 179-3534
Mfr. Part No.184768 & EMR6-AWN170-E-1
BrandEaton
MYR978.18
Each
units
Phase, Voltage - - - - 90 → 170V ac - - - - 0.1 → 30s - - 50 → 60Hz
RS Stock No. 2552206122
Mfr. Part No.2CSJ201001R0002 - RD3
BrandABB
MYR591.86
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2552206121
Mfr. Part No.2CSG152130R1202 - ELR96
BrandABB
MYR1,089.67
Each
units
- - - - - - - - - - - - - -