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 Voltage Sensing Range Current Sensitivity Minimum Current Sensed Maximum Current Sensed Phase Sensitivity Time Delay Temperature Sensitivity Temperature Sensing Range Frequency Sensing Range Current Range
RS Stock No. 102-6137
BrandRS PRO
MYR412.40
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 102-6130
BrandRS PRO
MYR235.79
Each
units
Voltage - SPDT Undervoltage 12 → 24V dc - - - - 0 → 30s - - - -
RS Stock No. 102-6136
BrandRS PRO
MYR265.54
Each
units
Phase, Voltage - SPDT Undervoltage - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 102-6133
BrandRS PRO
MYR335.45
Each
units
Voltage - SPDT Overvoltage, Undervoltage - - - - - 0.1 → 30s - - 48 → 63Hz -
RS Stock No. 102-6135
BrandRS PRO
MYR252.56
Each
units
Phase, Voltage - SPDT Undervoltage - - - - Phase Failure, Phase Sequence 100ms - - 48 → 63Hz -
RS Stock No. 102-6134
BrandRS PRO
MYR335.45
Each
units
Current - SPDT - - Overcurrent, Undercurrent 1A 10A - 0.1 → 30s - - 48 → 63Hz 1 → 10A
RS Stock No. 102-6131
BrandRS PRO
MYR225.59
Each
units
Voltage - SPDT Overvoltage, Undervoltage - - - - - 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 772-1215
Mfr. Part No.5SV8000-6KK
BrandSiemens
MYR1,296.94
Each
units
Current - - - - Residual 30mA 5A - 0.02 → 5s - - - 0.3 → 5A
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
MYR1,047.85
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
MYR418.69
Each
units
Current, Voltage - SPDT Overvoltage 0.4 → 500 V ac, 2 → 500V dc Overcurrent - - - <300ms - - - -
RS Stock No. 261-993
Mfr. Part No.84874320
BrandCrouzet
MYR873.48
Each
units
Speed - SP-NO/NC - - - - - - 15ms - - - -
RS Stock No. 857-7416
Mfr. Part No.PPA01CM44
MYR611.27
Each
units
Phase, Voltage - SPDT - 177 → 475V ac - - - Phase Loss, Phase Sequence - - - - -
RS Stock No. 124-0184
Mfr. Part No.RM22TR33
MYR552.60
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 380 → 480V ac - - - Phase Failure, Phase Sequence 0.1 → 30s - - 50 → 60Hz 10mA
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
MYR1,064.58
Each
units
Phase - SPDT - 177 → 550V ac - - - Phase Loss, Phase Sequence - - - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
MYR742.49
Each
units
Current - DPDT - - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - - 0.1 → 10A
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
MYR543.41
Each
units
Phase - DPDT - - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz -
RS Stock No. 884-2473
Mfr. Part No.MAC04D0100
BrandGIC
MYR190.26
Each
units
Phase, Voltage - DPDT Overvoltage Protection, Undervoltage Protection - - - - Neutral Loss, Phase Failure, Phase Reversal, Phase Sequence, Phase Symmetry - - - 47 → 53Hz -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
MYR482.41
Each
units
Level Control - DPDT - 24 → 240V ac - 10mA 5A - 0.1 → 5s - - 50 → 60Hz -
RS Stock No. 347-696
Mfr. Part No.FSRST30SLP-110/230VAC
BrandTempatron
MYR460.06
Each
units
Shaft Rotation Sensor - SPDT - Maximum of 30V dc - - - - 1 → 30s - - 50 → 60Hz Maximum of 5A
RS Stock No. 392-7267
Mfr. Part No.3RN1010-1CB00
BrandSiemens
MYR424.43
Each
units
Thermistor motor protection relay - SPDT - - - - - - - Overtemperature, Undertemperature +60 → +180°C - -