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. 146-250
Mfr. Part No.RM17TG00
TWD2,964.00
Each
units
Phase 208 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 145-960
Mfr. Part No.RM35LM33MW
TWD3,540.00
Each
units
- 20.4 264 V ac/dc - - - - - - - - - - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
TWD2,672.00
Each
units
Level 20.4 264 V ac/dc DPDT - 1 - - - - - 0.1 5 s - - -
RS Stock No. 146-193
Mfr. Part No.RM35HZ21FM
TWD7,306.00
Each
units
Frequency 120 277 V ac DPDT - - - - - - - 0.1 10 s - - 40 70 Hz
RS Stock No. 124-0184
Mfr. Part No.RM22TR33
TWD4,262.00
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. 124-0185
Mfr. Part No.RM22TU21
TWD2,649.00
Each
units
Phase, Voltage 160 288 V ac DPDT Undervoltage 3 200 240 V ac - - - Phase Failure, Phase Sequence ≤650 (Run-Up) ms - - -
RS Stock No. 146-143
Mfr. Part No.RM35UA12MW
TWD7,050.00
Each
units
Voltage 24 240 V ac/dc DPDT Overvoltage, Undervoltage - 1 100 V - - - - 0.3 30 s - - -
RS Stock No. 124-0188
Mfr. Part No.RM22UA33MR
TWD3,338.00
Each
units
Voltage 20.4 264 V ac/dc DPDT Overvoltage, Undervoltage 1 15 500 V ac/dc - - - - 0.1 30 s - - -
RS Stock No. 146-159
Mfr. Part No.RM17UAS16
TWD5,722.00
Each
units
Voltage 24 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 80 V ac/dc - - - - 0.1 10 s - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
TWD5,667.00
Each
units
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 146-591
Mfr. Part No.RM17TA00
TWD6,640.00
Each
units
Phase 208 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 124-0192
Mfr. Part No.RM35JA32MT
TWD5,205.00
Each
units
Current 323 456.5 V ac DPDT - 3 - Overcurrent, Undercurrent 150mA 15A - 0.1 30 s - - -
RS Stock No. 146-165
Mfr. Part No.RM17UAS14
TWD5,010.00
Each
units
Voltage 12 V SPDT Overvoltage, Self Powered, Undervoltage 1 9 15 V dc - - - - 0.1 10 s - - -
RS Stock No. 124-0189
Mfr. Part No.RM22UA33MT
TWD7,098.00
Each
units
Voltage 323 456.5 V ac DPDT Overvoltage, Undervoltage 3 15 500 V ac/dc - - - - 0.1 30 s - - -
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
TWD14,424.00
Each
units
Temperature 24 48 V dc SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
TWD2,867.00
Each
units
Phase 208 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 776-3648
Mfr. Part No.A9E16065
TWD8,370.00
Each
units
Time Delay 24 240 V ac, 24 V dc SPDT - - 24 240 V ac - - - - - - - -
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
TWD5,010.00
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. 179-9434
Mfr. Part No.RM22TU23
TWD3,412.00
Each
units
Phase 380 480 V ac DPDT Overvoltage, Undervoltage 3 <100 V ac - - - - - - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
TWD6,530.00
Each
units
Current 24 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 30 s - - -