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. 146-238
Mfr. Part No.RM17TG20
PHP5,962.49
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
PHP8,343.00
Each
units
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS Stock No. 145-960
Mfr. Part No.RM35LM33MW
PHP5,839.75
Each
units
- 20.4 → 264 V ac/dc - - - - - - - - - - - -
RS Stock No. 124-0191
Mfr. Part No.RM35JA32MR
PHP8,247.18
Each
units
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30 s - - -
RS Stock No. 124-0182
Mfr. Part No.RM22LG11MR
PHP3,704.81
Each
units
Level 20.4 → 264 V ac/dc SPDT - 1 - - - - - <0.6 (Run-Up) s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
PHP13,252.83
Each
units
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
PHP9,504.33
Each
units
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 146-200
Mfr. Part No.RM35JA31MW
PHP8,167.64
Each
units
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30 s - - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
PHP12,984.73
Each
units
Speed 24 → 240 V ac/dc SPDT - - - - - - - 0.6 → 60 s - - -
RS Stock No. 146-250
Mfr. Part No.RM17TG00
PHP7,111.75
Each
units
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
PHP10,011.96
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 124-0184
Mfr. Part No.RM22TR33
PHP6,612.35
Each
units
Phase, Voltage 304 → 576 V ac DPDT Overvoltage, Undervoltage 3 380 → 480 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s - - -
RS Stock No. 124-0190
Mfr. Part No.RM22UB34
PHP8,065.95
Each
units
Voltage 60 → 280 V ac DPDT Overvoltage, Undervoltage 1 80 → 300 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 124-0179
Mfr. Part No.RM22JA31MR
PHP15,402.46
Each
units
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 4mA 1A - 0.1 → 30 s - - -
RS Stock No. 146-452
Mfr. Part No.RM17UB310
PHP7,411.98
Each
units
Voltage 208 → 480 V ac SPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 183 → 528 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
PHP9,760.31
Each
units
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS Stock No. 124-0187
Mfr. Part No.RM22UA32MR
PHP7,968.47
Each
units
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 1 → 100 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 146-143
Mfr. Part No.RM35UA12MW
PHP8,657.55
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 1 → 100 V - - - - 0.3 → 30 s - - -
RS Stock No. 146-446
Mfr. Part No.RM35TM50MW
PHP12,187.10
Each
units
Phase, Temperature, Voltage 24 → 240 V ac/dc DPST Motor Voltage 3 208 → 480 V ac - - - Phase Failure, Phase Sequence 0.3 s Overtemperature, Undertemperature - -
RS Stock No. 124-0185
Mfr. Part No.RM22TU21
PHP3,985.11
Each
units
Phase, Voltage 160 → 288 V ac DPDT Undervoltage 3 200 → 240 V ac - - - Phase Failure, Phase Sequence ≤650 (Run-Up) ms - - -