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. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
TWD3,964.00
Each
units
Phase - SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30s - - -
RS Stock No. 850-5360
Mfr. Part No.LXPRC/S 400V
TWD2,719.00
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS Stock No. 876-5033
Mfr. Part No.1SVR730712R2200 CM-MSS.33S
BrandABB
TWD3,236.00
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 146-193
Mfr. Part No.RM35HZ21FM
TWD7,959.00
Each
units
Frequency - DPDT - - - - - - - 0.1 → 10s - - 40 → 70Hz
RS Stock No. 656-6269
Mfr. Part No.IL9837.11 5-200Hz UH=230V
BrandDold
TWD7,417.00
Each
units
Frequency - SPDT - - - - - - - 0.1 → 20s - - 5 → 200Hz
RS Stock No. 860-8693
Mfr. Part No.5TT3421
BrandSiemens
TWD2,926.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 758-6942
Mfr. Part No.3UG4632-1AW30
BrandSiemens
TWD4,986.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage - 10 → 600V ac/dc - - - - 0.1 → 20s - - -
RS Stock No. 819-3208
Mfr. Part No.K8AK-AS2 100-240VAC
BrandOmron
TWD5,085.00
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 8A - - - - -
RS Stock No. 240-8995
Mfr. Part No.MK9052.11 AC50/60Hz 230V
BrandDold
TWD2,142.00
Each
units
Thermistor - SPDT - - - - - - - <20ms - - -
RS Stock No. 392-7267
Mfr. Part No.3RN1010-1CB00
BrandSiemens
TWD3,835.00
Each
units
Thermistor motor protection relay - SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 794-3951
Mfr. Part No.MJ93BK
BrandGIC
TWD2,050.00
Each
units
Thermistor - DPDT - 3 - - - 6A - 100 ms, 500ms - - -
RS Stock No. 102-6147
Mfr. Part No.221789
BrandEaton
TWD4,280.00
Each
units
Liquid Level - SPDT - - - - - - - 250ms - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
TWD4,880.00
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 347-696
Mfr. Part No.FSRST30SLP-110/230VAC
BrandTempatron
TWD3,192.00
Each
units
Shaft Rotation Sensor - SPDT - - Maximum of 30V dc - - - - 1 → 30s - - 50 → 60Hz
RS Stock No. 518-7180
Mfr. Part No.3UG4617-1CR20
BrandSiemens
TWD9,779.00
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 262-025
Mfr. Part No.84873025
BrandCrouzet
TWD5,204.00
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10s - - -
RS Stock No. 361-1625
Mfr. Part No.45UFR 230VAC
TWD3,408.00
Each
units
Frequency - DPDT - 1 - - - - - 200ms - - 40 → 60 Hz, 50 → 70Hz
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
TWD4,977.00
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 262-047
Mfr. Part No.84873024
BrandCrouzet
TWD4,191.00
Each
units
Phase - SP-NO/NC - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10s - - -
RS Stock No. 857-7280
Mfr. Part No.DWB01CM4810A
TWD9,501.00
Each
units
Power Factor - SPDT - 3 - - - 5 A, 10A - 1 → 30s - - -