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. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
PHP5,584.63
Each
units
Phase 160 690 V ac SPDT - - 160 690 V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 145-960
Mfr. Part No.RM35LM33MW
PHP5,839.75
Each
units
- 20.4 264 V ac/dc - - - - - - - - - - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
PHP8,343.00
Each
units
Level 20.4 264 V ac/dc DPDT - 1 - - - - - 0.1 5 s - - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
PHP4,608.32
Each
units
Temperature 110 130 V ac, 220 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300
BrandABB
PHP13,899.07
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 65 Hz
RS Stock No. 801-6233
Mfr. Part No.2866064
PHP14,481.26
Each
units
Phase, Voltage 24 V dc, 24 230 V ac DPDT Undervoltage, Window 3 280 520 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 10 s - - -
RS Stock No. 775-7983
Mfr. Part No.1SVR730840R0500
BrandABB
PHP13,345.20
Each
units
Current 24 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 30 s - - 50 60 Hz
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
PHP12,658.30
Each
units
Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 5 s - - -
RS Stock No. 124-0191
Mfr. Part No.RM35JA32MR
PHP8,976.99
Each
units
Current 20.4 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 30 s - - -
RS Stock No. 298-9387
Mfr. Part No.45200 230VAC
PHP4,279.28
Each
units
Temperature 230 V ac SPDT - - - - - - - 50 ms Overtemperature - -
RS Stock No. 124-0182
Mfr. Part No.RM22LG11MR
PHP3,783.69
Each
units
Level 20.4 → 264 V ac/dc SPDT - 1 - - - - - <0.6 (Run-Up) s - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
PHP6,848.11
Each
units
Phase 115 240 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 30 s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
PHP13,252.83
Each
units
Phase, Voltage 220 480 V ac DPDT Overvoltage, Undervoltage 3 194 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 10 s - - -
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. 776-1585
Mfr. Part No.72.01.8.240.0002
BrandFinder
PHP4,721.45
Each
units
Level 230 240 V ac SPDT - 1 - - - - - 0.5 7 s - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
PHP5,905.45
Each
units
Current 24 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
PHP8,854.30
Each
units
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 123-9724
Mfr. Part No.V2PM400Y/230VS10
BrandTele
PHP6,493.85
Each
units
Phase 230 400 V ac SPDT - 1, 3 - - - - Phase Loss, Phase Sequence 0.1 10 s, 200 ms - - -
RS Stock No. 442-9427
Mfr. Part No.1SVR550870R9400
BrandABB
PHP4,892.83
Each
units
Phase, Voltage 185 265 V ac, 320 460 V ac SPST Overvoltage, Undervoltage 1, 3 185 265 V ac, 320 460 V ac - - - NEUTRAL 500 ms - - -
RS Stock No. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
PHP14,588.96
Each
units
Phase, Voltage 300 500 V ac DPDT Overvoltage, Undervoltage 3 300 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 30 s, 0 s - - 45 65 Hz
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