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. 240-8967
Mfr. Part No.BD9080.12 3AC400V UH=AC230V
BrandDold
PHP19,213.43
Each
units
Phase, Voltage 400 V ac DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 5 s - - -
RS Stock No. 914-3945
Mfr. Part No.ECPF03
BrandRelpol
PHP1,319.03
Each
units
Phase, Voltage 220 → 460 V SPDT Overvoltage, Undervoltage 3 176 → 552 V, 45 → 65 Hz - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 321-6826
Mfr. Part No.45200 110VAC
PHP4,488.59
Each
units
Temperature 110 V ac SPDT - - - - - - - 50 ms Overtemperature - -
RS Stock No. 111-3091
Mfr. Part No.K8DT-AS2CA
BrandOmron
PHP10,579.03
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 262-198
Mfr. Part No.84873220
BrandCrouzet
PHP8,904.81
Each
units
Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 614-9448
Mfr. Part No.84872142
BrandCrouzet
PHP6,762.45
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
PHP8,561.62
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20 s - - -
RS Stock No. 775-7885
Mfr. Part No.1SVR730774R3300
BrandABB
PHP13,364.60
Each
units
Phase 300 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
PHP9,504.33
Each
units
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 850-5373
Mfr. Part No.LXPRC 400V
PHP4,377.20
Each
units
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage - 300 → 380 (Under) V, 420 → 500 (Over) V - - - Phase Failure 0.2 → 10 s - - -
RS Stock No. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
PHP8,167.85
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 240-8844
Mfr. Part No.BD5936.17 AC50/60Hz 230V
BrandDold
PHP17,781.60
Each
units
Standstill 230 V ac DPDT - - - - - - - - - - -
RS Stock No. 819-3220
Mfr. Part No.K8AK-AW2 100-240VAC
BrandOmron
PHP6,583.47
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 5A - - - - -
RS Stock No. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
PHP5,114.25
Each
units
Phase, Voltage 320 → 460 V ac SPST Overvoltage, Undervoltage 1, 3 320 → 460 V ac - - - Phase Failure 500 ms - - -
RS Stock No. 776-1594
Mfr. Part No.72.01.9.024.0000
BrandFinder
PHP3,801.90
Each
units
Level 24 V dc SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 614-9404
Mfr. Part No.84872120
BrandCrouzet
PHP7,623.13
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS Stock No. 859-3070
Mfr. Part No.DIB01CD485A
PHP13,225.31
Each
units
Current 24 → 48 V ac/dc SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6 s - - -
RS Stock No. 914-3957
Mfr. Part No.ECPF08
BrandRelpol
PHP1,849.75
Each
units
Phase, Voltage 220 → 460 V SPDT Overvoltage, Undervoltage 3 176 → 552 V, 45 → 65 Hz - - - Phase Failure, Phase Sequence 2 s - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
PHP6,160.47
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS Stock No. 321-6769
Mfr. Part No.45150 110VAC
PHP5,924.35
Each
units
Current 110 V ac SPDT - 1 - Overcurrent 5mA 1A - 0.1 → 3 s - - -
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