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. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
MYR370.37
Each
units
Phase - SPST - 1, 3 - - - - NEUTRAL 150ms - - -
RS Stock No. 124-0182
Mfr. Part No.RM22LG11MR
MYR312.97
Each
units
Level - SPDT - 1 - - - - - - - - -
RS Stock No. 376-3754
Mfr. Part No.TR4801-02-24VAC/DC
BrandTempatron
MYR564.49
Each
units
Speed - SPDT - - - - - - - - - - -
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
MYR2,076.46
Each
units
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
MYR371.17
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
MYR703.63
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS Stock No. 361-1625
Mfr. Part No.45UFR 230VAC
MYR519.53
Each
units
Frequency - DPDT - 1 - - - - - 200ms - - 40 → 60 Hz, 50 → 70Hz
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
MYR1,424.53
Each
units
Current - SPDT - - - - 0.1A 10A - 0.5 → 5s - - -
RS Stock No. 262-047
Mfr. Part No.84873024
BrandCrouzet
MYR703.97
Each
units
Phase - SP-NO/NC - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10s - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
MYR815.75
Each
units
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
MYR666.30
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200
BrandABB
MYR730.66
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 124-0190
Mfr. Part No.RM22UB34
MYR645.91
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 80 → 300V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 123-9743
Mfr. Part No.G2TF02 24-240VAC/DC
BrandTele
MYR519.84
Each
units
Temperature - DPDT - 1 - - - - - - - - -
RS Stock No. 876-5783
Mfr. Part No.CM-TCS.22S
BrandABB
MYR992.10
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 → +100°C 45 → 65Hz
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
MYR233.48
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 538-3805
Mfr. Part No.P48SMP 1-30SEC 115/230VAC
MYR370.89
Each
units
Current - SPDT - - - - - - - 1 → 30 s, 2 → 60s - - -
RS Stock No. 123-9719
Mfr. Part No.E3PF400VSY02
BrandTele
MYR611.16
Each
units
Phase, Voltage - DPDT Self Powered 3 - - - - Phase Failure, Phase Sequence 100ms - - -
RS Stock No. 445-9068
Mfr. Part No.IL5880.12 AC50-400Hz 220-240V 5-100kOHM
BrandDold
MYR1,126.04
Each
units
Voltage - DPDT - 1, 3 0 → 500V ac - - - - <1.3s - - -
RS Stock No. 850-5392
Mfr. Part No.LMCCR-10A 24-230VAC/DC
MYR450.50
Each
units
Current - SPDT - - - Overcurrent, Undercurrent 0.2A 10A - 0.1 → 30s - - -