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. 776-3663
Mfr. Part No.A9E16070
kr 2 497,98
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS Stock No. 124-0187
Mfr. Part No.RM22UA32MR
kr 1 114,17
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. 146-238
Mfr. Part No.RM17TG20
kr 866,28
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
kr 1 952,32
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
kr 634,28
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. 124-0184
Mfr. Part No.RM22TR33
kr 1 158,62
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. 146-092
Mfr. Part No.RM17JC00MW
kr 871,88
Each
Units
Current 24 → 240 V ac/dc SPDT - - - Overcurrent 2A 20A - 0.5 s - - -
RS Stock No. 146-519
Mfr. Part No.RM17UBE15
kr 1 221,09
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. 146-143
Mfr. Part No.RM35UA12MW
kr 2 015,02
Each
Units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 1 → 100 V - - - - 0.3 → 30 s - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
kr 1 032,22
Each
Units
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS Stock No. 146-159
Mfr. Part No.RM17UAS16
kr 1 016,06
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. 776-3657
Mfr. Part No.A9E16066
kr 1 952,32
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS Stock No. 146-165
Mfr. Part No.RM17UAS14
kr 1 016,06
Each
Units
Voltage 12 V SPDT Overvoltage, Self Powered, Undervoltage 1 9 → 15 V dc - - - - 0.1 → 10 s - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
kr 1 047,65
Each
Units
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 124-0190
Mfr. Part No.RM22UB34
kr 1 178,45
Each
Units
Voltage 60 → 280 V ac DPDT Overvoltage, Undervoltage 1 80 → 300 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 146-496
Mfr. Part No.RM17TE00
kr 1 109,99
Each
Units
Phase, Voltage 208 → 480 V ac SPDT Overvoltage, Undervoltage 3 183 → 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 124-0186
Mfr. Part No.RM22UA31MR
kr 1 939,08
Each
Units
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 50 mV ac/dc → 5 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 179-0019
Mfr. Part No.RMNF22TB30
kr 1 244,16
Each
Units
Frequency, Voltage with NFC 208 → 480 V ac - - 3 - - - - - - - - -
RS Stock No. 146-531
Mfr. Part No.RM17UBE16
kr 1 221,09
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. 776-3654
Mfr. Part No.A9E16069
kr 2 455,29
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -