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
TWD3,902.00
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
TWD3,695.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 8A - - - - -
RS Stock No. 111-3111
Mfr. Part No.K8DT-VS3CA
BrandOmron
TWD3,790.00
Each
units
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 111-3122
Mfr. Part No.K8DT-VW3TD
BrandOmron
TWD4,146.00
Each
units
Voltage 24 V ac/dc SPST Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 111-3124
Mfr. Part No.K8DT-LS1CD
BrandOmron
TWD2,444.00
Each
units
Resistance 24 V ac/dc SPDT - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 111-3087
Mfr. Part No.K8DT-AS1CA
BrandOmron
TWD3,866.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20 mA 20 mA, 100 mA, 500 mA - 250 ms - - -
RS Stock No. 111-3098
Mfr. Part No.K8DT-AS3TD
BrandOmron
TWD3,572.00
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 111-3100
Mfr. Part No.K8DT-AW1CD
BrandOmron
TWD5,357.00
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. 111-3112
Mfr. Part No.K8DT-VS3CD
BrandOmron
TWD5,015.00
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. 819-3204
Mfr. Part No.K8AK-AS1 24VAC/DC
BrandOmron
TWD3,695.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -
RS Stock No. 111-3136
Mfr. Part No.K8DT-PH1TN
BrandOmron
TWD2,058.00
Each
units
Phase 200 → 480 V ac SPST - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 819-3273
Mfr. Part No.K8AK-TH11S 100-240VAC
BrandOmron
TWD4,193.00
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 999°C -
RS Stock No. 111-3133
Mfr. Part No.K8DT-TH2TA
BrandOmron
TWD4,251.00
Each
units
Temperature 100 → 240 V ac SPST - - - - - - - - Overtemperature 0 → +1800°C -
RS Stock No. 819-3295
Mfr. Part No.K8AK-VS3 100-240VAC
BrandOmron
TWD3,672.00
Each
units
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V ac/dc, 30 → 300 V ac/dc, 60 → 600 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 111-3128
Mfr. Part No.K8DT-TH1CD
BrandOmron
TWD4,645.00
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - - Overtemperature 0 → +999°C -
RS Stock No. 819-3214
Mfr. Part No.K8AK-AS3 24VAC/DC
BrandOmron
TWD5,422.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 819-3305
Mfr. Part No.K8AK-VW3 100-240VAC
BrandOmron
TWD4,100.00
Each
units
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V ac/dc, 30 → 300 V ac/dc, 60 → 600 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 111-3121
Mfr. Part No.K8DT-VW3TA
BrandOmron
TWD4,761.00
Each
units
Voltage 100 → 240 V ac SPST Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 111-3099
Mfr. Part No.K8DT-AW1CA
BrandOmron
TWD5,357.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20 mA 20 mA, 100 mA, 500 mA - 250 ms - - -
RS Stock No. 819-3223
Mfr. Part No.K8AK-AW1 100-240VAC
BrandOmron
TWD5,058.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -