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. 102-6136
BrandRS PRO
PHP3,097.93
Each
units
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 300 → 500 (Undervoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 102-6133
BrandRS PRO
PHP5,168.35
Each
units
Voltage 24 → 230 V ac/dc SPDT Overvoltage, Undervoltage 1 50 → 500 V - - - - 0.1 → 30 s - - 48 → 63 Hz
RS Stock No. 102-6134
BrandRS PRO
PHP5,016.98
Each
units
Current 24 → 230 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30 s - - 48 → 63 Hz
RS Stock No. 102-6130
BrandRS PRO
PHP2,750.86
Each
units
Voltage 12 → 24 V dc SPDT Undervoltage 1 12 → 24 V dc - - - - 0 → 30 s - - -
RS Stock No. 102-6135
BrandRS PRO
PHP2,946.44
Each
units
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100 ms - - 48 → 63 Hz
RS Stock No. 102-6137
BrandRS PRO
PHP6,025.40
Each
units
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage 3 300 → 380 (Undervoltage) V, 420 → 500 (Overvoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 102-6131
BrandRS PRO
PHP3,845.40
Each
units
Voltage 230 V ac SPDT Overvoltage, Undervoltage 1 173 → 218 (Undervoltage) V, 242 → 288 (Overvoltage) V - - - - 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
PHP11,818.63
Each
units
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
PHP7,820.01
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 15 → 600 V - - - - 0.1 → 3 s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
PHP14,703.65
Each
units
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
PHP9,598.61
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 418-4988
Mfr. Part No.3RS1040-1GW50
BrandSiemens
PHP18,362.12
Each
units
Temperature 24 → 240 V ac/dc DPDT - - - - - - - 0 → 999 s Overtemperature, Undertemperature -50 → +500°C -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
PHP12,021.01
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 746-6022
Mfr. Part No.3RN1012-1CK00
BrandSiemens
PHP8,819.98
Each
units
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Winding Temperature +60 → +180°C -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
PHP6,273.75
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS Stock No. 262-211
Mfr. Part No.84872152
BrandCrouzet
PHP7,097.69
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 629-386
Mfr. Part No.M3PPI 300-500vAC
PHP3,143.10
Each
units
Phase 300 → 500 V ac - - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 361-1619
Mfr. Part No.45051 24/115/230VAC
PHP6,464.41
Each
units
Voltage 24 V ac, 115 V ac, 230 V ac SPDT Overvoltage, Undervoltage 1 Maximum of 230 V ac - - - - 0.1 → 10 s - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
PHP9,189.81
Each
units
Voltage 120 → 277 V ac 2NO/2NC Overvoltage, Undervoltage 3 96 → 332 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300
BrandABB
PHP14,096.88
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
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