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. 111-3095
Mfr. Part No.K8DT-AS3CA
BrandOmron
TWD3,680.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 111-3096
Mfr. Part No.K8DT-AS3CD
BrandOmron
TWD3,634.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 819-3232
Mfr. Part No.K8AK-AW3 100-240VAC
BrandOmron
TWD3,694.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10 200A - - - - -
RS Stock No. 111-3117
Mfr. Part No.K8DT-VW2TA
BrandOmron
TWD3,996.00
Each
units
Voltage 100 → 240 V ac SPST Overvoltage, Undervoltage 1 1 → 10 V, 3 → 30 V, 15 → 150 V - - - - 250 ms - - -
RS Stock No. 111-3118
Mfr. Part No.K8DT-VW2TD
BrandOmron
TWD3,946.00
Each
units
Voltage 24 V ac/dc SPST Overvoltage, Undervoltage 1 1 → 10 V, 3 → 30 V, 15 → 150 V - - - - 250 ms - - -
RS Stock No. 111-3134
Mfr. Part No.K8DT-TH2TD
BrandOmron
TWD5,468.00
Each
units
Temperature 24 V ac/dc SPST - - - - - - - - Overtemperature 0 → +1800°C -
RS Stock No. 819-3302
Mfr. Part No.K8AK-VW2 24VAC/DC
BrandOmron
TWD4,020.00
Each
units
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 3 → 30 V ac/dc, 15 → 150 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 111-3105
Mfr. Part No.K8DT-AW2TA
BrandOmron
TWD6,152.00
Each
units
Current 100 → 240 V ac SPST - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 111-3092
Mfr. Part No.K8DT-AS2CD
BrandOmron
TWD3,680.00
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 111-3112
Mfr. Part No.K8DT-VS3CD
BrandOmron
TWD5,617.00
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. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
TWD2,225.00
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 111-3100
Mfr. Part No.K8DT-AW1CD
BrandOmron
TWD6,152.00
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. 111-3114
Mfr. Part No.K8DT-VS3TD
BrandOmron
TWD5,617.00
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. 111-3093
Mfr. Part No.K8DT-AS2TA
BrandOmron
TWD3,578.00
Each
units
Current 100 → 240 V ac SPST - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 111-3103
Mfr. Part No.K8DT-AW2CA
BrandOmron
TWD6,152.00
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -
RS Stock No. 819-3270
Mfr. Part No.K8AK-TH12S 100-240VAC
BrandOmron
TWD4,073.00
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 10 -
RS Stock No. 111-3113
Mfr. Part No.K8DT-VS3TA
BrandOmron
TWD5,617.00
Each
units
Voltage 100 → 240 V ac - Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 111-3119
Mfr. Part No.K8DT-VW3CA
BrandOmron
TWD4,044.00
Each
units
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -