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. 857-7167
Mfr. Part No.DUA01CB23500V
MYR835.47
Each
units
Current, Voltage - SPDT Overvoltage 1 0.4 → 4 V ac, 2 → 20 V ac/dc, 5 → 50 V ac/dc, 20 → 200 V ac/dc, 50 → 500V ac/dc Overcurrent - - - - - - -
RS Stock No. 876-5099
Mfr. Part No.716401
MYR317.47
Each
units
- - - - - - Overcurrent 1A 10A - - - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
MYR940.01
Each
units
Temperature - SPST - - - - - - - - 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. 397-9202
Mfr. Part No.45PUVR-4W 400VAC
MYR541.57
Each
units
Phase, Voltage - DPDT Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
RS Stock No. 298-9416
Mfr. Part No.45175 230VAC
MYR519.07
Each
units
Speed - SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30s - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
MYR530.01
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
MYR2,392.75
Each
units
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 376-3754
Mfr. Part No.TR4801-02-24VAC/DC
BrandTempatron
MYR669.61
Each
units
Speed - SPDT - - - - - - - - - - -
RS Stock No. 397-9173
Mfr. Part No.70PCVR 400VAC
MYR812.61
Each
units
Phase, Voltage - 4PDT Overvoltage, Undervoltage 3 Maximum of 400V ac - - - Phase Loss 200ms - - -
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200 CM-MSS.41S
BrandABB
MYR853.57
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
MYR266.11
Each
units
Voltage - SPDT Undervoltage - 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 327-7641
Mfr. Part No.IL9151.12 2-450kOHM AC230V 0.2-20S
BrandDold
MYR1,000.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-0180
Mfr. Part No.RM22LA32MR
MYR635.93
Each
units
Level - DPDT - 1 - - - - - 0.1 → 30s - - -
RS Stock No. 397-9189
Mfr. Part No.70PCVR-4W 400VAC
MYR812.61
Each
units
Phase, Voltage - 4PDT Overvoltage, Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
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. 261-915
Mfr. Part No.84873022
BrandCrouzet
MYR530.01
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 876-5033
Mfr. Part No.1SVR730712R2200 CM-MSS.33S
BrandABB
MYR487.05
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
MYR1,155.93
Each
units
Current - SPDT - - - - 0.1A 10A - 0.5 → 5s - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
MYR719.02
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -