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. 916-0189
Mfr. Part No.PMA20240
BrandLovato
SGD276.30
Each
units
Current - SPDT - 1 - Overcurrent 0.25A 16A - 0.1 → 30s - - -
RS Stock No. 916-0081
Mfr. Part No.PMV20A240
BrandLovato
SGD184.07
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 916-0120
Mfr. Part No.PMV50NA440
BrandLovato
SGD398.99
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0091
Mfr. Part No.PMV30A575
BrandLovato
SGD224.34
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0114
Mfr. Part No.PMV50A575
BrandLovato
SGD299.94
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0192
Mfr. Part No.PMA50A480
BrandLovato
SGD349.36
Each
units
Current - SPDT - 1, 3 - Overcurrent, Undercurrent 0.1A 16A - 0.1 → 10s - - -
RS Stock No. 916-0195
Mfr. Part No.PMA50A240
BrandLovato
SGD349.36
Each
units
Current - SPDT - 1, 3 - Overcurrent, Undercurrent 0.1A 16A - 0.1 → 10s - - -
RS Stock No. 916-0126
Mfr. Part No.PMV50NA240
BrandLovato
SGD398.99
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0186
Mfr. Part No.PMA40240
BrandLovato
SGD369.70
Each
units
Current - SPDT - 1 - Overcurrent 1mA 16A - 0.1 → 30s - - -
RS Stock No. 916-0085
Mfr. Part No.PMV20A575
BrandLovato
SGD189.92
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 916-0110
Mfr. Part No.PMV50A240
BrandLovato
SGD294.80
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0132
Mfr. Part No.PMV55A240
BrandLovato
SGD277.73
Each
units
Voltage - SPDT Self Powered 1 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0136
Mfr. Part No.PMV55A440
BrandLovato
SGD277.73
Each
units
Voltage - SPDT Self Powered 1 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0182
Mfr. Part No.PMA30240
BrandLovato
SGD308.50
Each
units
Current - SPDT - 1 - Overcurrent 0.25A 16A - 0.1 → 30s - - -
RS Stock No. 916-0198
Mfr. Part No.PMA50A415
BrandLovato
SGD349.36
Each
units
Current - SPDT - 1, 3 - Overcurrent, Undercurrent 0.1A 16A - 0.1 → 10s - - -
RS Stock No. 916-0164
Mfr. Part No.PMV70NA600
BrandLovato
SGD392.02
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0088
Mfr. Part No.PMV10A440
BrandLovato
SGD141.11
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 916-0108
Mfr. Part No.PMV40A575
BrandLovato
SGD227.71
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 916-0094
Mfr. Part No.PMV20A600
BrandLovato
SGD184.07
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 916-0205
Mfr. Part No.PMA60A415
BrandLovato
SGD451.28
Each
units
Phase - SPDT - 1, 3 - - - - Phase Shift 0.1 → 30s - - -