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. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
PHP14,801.55
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
PHP8,205.22
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
PHP16,992.42
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
PHP8,906.42
Each
units
Level Control - SPDT - - - - - - - - - - -
RS Stock No. 418-4988
Mfr. Part No.3RS1040-1GW50
BrandSiemens
PHP24,855.42
Each
units
Temperature - DPDT - - - - - - - 0 → 999s Overtemperature, Undertemperature -50 → +500°C -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300 CM-PFS.S
BrandABB
PHP8,153.89
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 146-238
Mfr. Part No.RM17TG20
PHP8,724.66
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
PHP9,611.30
Each
units
Voltage - 2NO/2NC Overvoltage, Undervoltage 3 96 → 332V ac - - - - 0.3 → 30s - - -
RS Stock No. 262-211
Mfr. Part No.84872152
BrandCrouzet
PHP8,072.99
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 629-386
Mfr. Part No.M3PPI 300-500vAC
PHP3,051.28
Each
units
Phase - - - - - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100 CM-MSS.13S
BrandABB
PHP5,683.13
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300 CM-PVS.41S
BrandABB
PHP14,262.68
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
PHP8,916.11
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
PHP7,680.05
Each
units
Phase - SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
PHP5,531.07
Each
units
Current, Voltage - SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500V dc Overcurrent - - - <300ms - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
PHP9,077.99
Each
units
Phase - SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30s - - -
RS Stock No. 124-0191
Mfr. Part No.RM35JA32MR
PHP9,723.66
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30s - - -
RS Stock No. 124-0182
Mfr. Part No.RM22LG11MR
PHP4,643.42
Each
units
Level - SPDT - 1 - - - - - - - - -
RS Stock No. 801-6233
Mfr. Part No.2866064
PHP13,027.14
Each
units
Phase, Voltage - DPDT Undervoltage, Window 3 280 → 520V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
PHP11,435.49
Each
units
Current - SPDT - - - - 0.1A 10A - 0.5 → 5s - - -