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
TWD4,228.00
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 819-3208
Mfr. Part No.K8AK-AS2 100-240VAC
BrandOmron
TWD3,409.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 8A - - - - -
RS Stock No. 111-3088
Mfr. Part No.K8DT-AS1CD
BrandOmron
TWD3,680.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20 mA 20 mA, 100 mA, 500 mA - 250 ms - - -
RS Stock No. 111-3123
Mfr. Part No.K8DT-LS1CA
BrandOmron
TWD2,210.00
Each
units
Resistance 100 → 240 V ac SPDT - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 111-3089
Mfr. Part No.K8DT-AS1TA
BrandOmron
TWD3,578.00
Each
units
Current 100 → 240 V ac SPST - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20 mA 20 mA, 100 mA, 500 mA - 250 ms - - -
RS Stock No. 111-3124
Mfr. Part No.K8DT-LS1CD
BrandOmron
TWD2,326.00
Each
units
Resistance 24 V ac/dc SPDT - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
TWD2,225.00
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 111-3135
Mfr. Part No.K8DT-PH1CN
BrandOmron
TWD2,109.00
Each
units
Phase 200 → 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 111-3098
Mfr. Part No.K8DT-AS3TD
BrandOmron
TWD3,400.00
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 111-3128
Mfr. Part No.K8DT-TH1CD
BrandOmron
TWD4,148.00
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - - Overtemperature 0 → +999°C -
RS Stock No. 111-3133
Mfr. Part No.K8DT-TH2TA
BrandOmron
TWD4,046.00
Each
units
Temperature 100 → 240 V ac SPST - - - - - - - - Overtemperature 0 → +1800 -
RS Stock No. 111-3131
Mfr. Part No.K8DT-TH2CA
BrandOmron
TWD4,094.00
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - - Overtemperature 0 → +1800°C -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
TWD2,225.00
Each
units
Level Control 24 V ac/dc SPDT - - - - - - - - - - -
RS Stock No. 111-3112
Mfr. Part No.K8DT-VS3CD
BrandOmron
TWD3,655.00
Each
units
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 111-3136
Mfr. Part No.K8DT-PH1TN
BrandOmron
TWD1,959.00
Each
units
Phase 200 → 480 V ac SPST - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
TWD4,450.00
Each
units
Phase 115 → 240 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 819-3239
Mfr. Part No.K8AK-AW2 24VAC/DC
BrandOmron
TWD3,694.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1 5A - - - - -
RS Stock No. 111-3090
Mfr. Part No.K8DT-AS1TD
BrandOmron
TWD3,578.00
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20 mA 20 mA, 100 mA, 500 mA - 250 ms - - -
RS Stock No. 111-3094
Mfr. Part No.K8DT-AS2TD
BrandOmron
TWD3,578.00
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 111-3122
Mfr. Part No.K8DT-VW3TD
BrandOmron
TWD3,946.00
Each
units
Voltage 24 V ac/dc SPST Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -