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. 124-0184
Mfr. Part No.RM22TR33
MYR639.11
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 380 → 480V ac - - - Phase Failure, Phase Sequence 0.1 → 30s - - 50 → 60Hz
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
MYR1,032.59
Each
units
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
MYR999.24
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
MYR696.68
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
MYR507.92
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
MYR602.10
Each
units
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 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. 124-0190
Mfr. Part No.RM22UB34
MYR769.49
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 80 → 300V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 146-250
Mfr. Part No.RM17TG00
MYR543.57
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
MYR2,392.75
Each
units
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 124-0185
Mfr. Part No.RM22TU21
MYR356.97
Each
units
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
MYR746.20
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
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 - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
MYR940.01
Each
units
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 124-0180
Mfr. Part No.RM22LA32MR
MYR635.93
Each
units
Level - DPDT - 1 - - - - - 0.1 → 30s - - -
RS Stock No. 124-0182
Mfr. Part No.RM22LG11MR
MYR372.09
Each
units
Level - SPDT - 1 - - - - - - - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
MYR455.76
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 146-608
Mfr. Part No.RM17TT00
MYR612.43
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 776-3654
Mfr. Part No.A9E16069
MYR1,661.72
Each
units
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS Stock No. 146-187
Mfr. Part No.RM35UA13MW
MYR756.08
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -