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. 262-205
Mfr. Part No.84873221
BrandCrouzet
MYR780.48
Each
units
Voltage - 2NO/2NC Overvoltage, Undervoltage 3 96 → 332V ac - - - - 0.3 → 30s - - -
RS Stock No. 321-6848
Mfr. Part No.45175 110VAC
MYR384.97
Each
units
Speed - SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30s - - -
RS Stock No. 916-0085
Mfr. Part No.PMV20A575
BrandLovato
MYR513.11
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
MYR847.74
Each
units
Speed - SPDT - - - - - - - 0.1 → 20s - - -
RS Stock No. 123-9717
Mfr. Part No.E1YM400VS10
BrandTele
MYR792.10
Each
units
Phase, Voltage - SPDT Undervoltage 1, 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 361-1631
Mfr. Part No.45OFR 230VAC
MYR426.89
Each
units
Frequency - DPDT - 1 - - - - - 200ms - - 40 → 60 Hz, 50 → 70Hz
RS Stock No. 146-238
Mfr. Part No.RM17TG20
MYR478.94
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 442-9427
Mfr. Part No.1SVR550870R9400
BrandABB
MYR406.14
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 185 → 265 V ac, 320 → 460V ac - - - NEUTRAL 500ms - - -
RS Stock No. 890-3887
Mfr. Part No.2905597
MYR548.17
Each
units
Voltage - DPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - 48 → 63Hz
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
MYR604.58
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 146-496
Mfr. Part No.RM17TE00
MYR1,642.67
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3 183 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
MYR551.54
Each
units
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
MYR912.76
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 775-7958
Mfr. Part No.1SVR730830R0500
BrandABB
MYR1,131.37
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 - - - - - 0 s, 0.1 → 30s - - -
RS Stock No. 801-6224
Mfr. Part No.2866035
MYR659.42
Each
units
Voltage - SPDT Undervoltage 1 0 → 300V ac/dc - - - - 0.2 → 10s - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
MYR552.01
Each
units
Phase - SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30s - - -
RS Stock No. 321-6826
Mfr. Part No.45200 110VAC
MYR349.90
Each
units
Temperature - SPDT - - - - - - - 50ms Overtemperature - -
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
MYR927.10
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -
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. 124-0187
Mfr. Part No.RM22UA32MR
MYR638.10
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 1 → 100V ac/dc - - - - 0.1 → 30s - - -