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. 261-993
Mfr. Part No.84874320
BrandCrouzet
$309.51
Each
units
Speed - SP-NO/NC - - - - - - - 15ms - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
$236.90
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
$387.68
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS Stock No. 857-7696
Mfr. Part No.DPB01CM48
$557.52
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 518-7180
Mfr. Part No.3UG4617-1CR20
BrandSiemens
$536.51
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
$637.66
Each
units
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS Stock No. 776-3657
Mfr. Part No.A9E16066
$349.50
Each
units
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
$475.10
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
$317.68
Each
units
Speed - SPDT - - - - - - - 0.1 → 20s - - -
RS Stock No. 321-6826
Mfr. Part No.45200 110VAC
$147.17
Each
units
Temperature - SPDT - - - - - - - 50ms Overtemperature - -
RS Stock No. 876-5023
Mfr. Part No.1SVR730712R1400
BrandABB
$284.96
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
$145.22
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
$253.10
Each
units
Current, Voltage - SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500V dc Overcurrent - - - <300ms - - -
RS Stock No. 146-159
Mfr. Part No.RM17UAS16
$316.79
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 262-132
Mfr. Part No.84872140
BrandCrouzet
$232.86
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 9 → 15V dc - - - - 0.1 → 10s - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
$306.23
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 123-9743
Mfr. Part No.G2TF02 24-240VAC/DC
BrandTele
$196.18
Each
units
Temperature - DPDT - 1 - - - - - - - - -
RS Stock No. 850-5364
Mfr. Part No.LXPRC/S-4W 230V (400V)
$128.38
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS Stock No. 614-9432
Mfr. Part No.84872141
BrandCrouzet
$221.92
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 463-3474
Mfr. Part No.84872030
BrandCrouzet
$264.98
Each
units
Voltage - SPDT - 1 - - - - - 0.1 → 3s - - -