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. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
PHP9,410.40
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
PHP8,305.50
Each
units
Phase 115 → 240 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 819-3289
Mfr. Part No.K8AK-TH12S 24VAC/DC
BrandOmron
PHP7,256.60
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - 100 ms Overtemperature 0 → 10°C -
RS Stock No. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
PHP8,305.50
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 111-3091
Mfr. Part No.K8DT-AS2CA
BrandOmron
PHP10,211.70
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. 819-3220
Mfr. Part No.K8AK-AW2 100-240VAC
BrandOmron
PHP6,583.47
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 5A - - - - -
RS Stock No. 819-3270
Mfr. Part No.K8AK-TH12S 100-240VAC
BrandOmron
PHP7,960.90
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 10°C -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
PHP3,888.90
Each
units
Level Control 24 V ac/dc SPDT - - - - - - - - - - -
RS Stock No. 819-3201
Mfr. Part No.K8AK-AS1 100-240VAC
BrandOmron
PHP7,738.60
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -
RS Stock No. 819-3264
Mfr. Part No.K8AKPW2380480VAC
BrandOmron
PHP8,305.50
Each
units
Voltage 220 → 480 V ac SPDT Overvoltage, Undervoltage 3 - - - - - 0.1 → 30 s - - -
RS Stock No. 819-3226
Mfr. Part No.K8AK-AW1 24VAC/DC
BrandOmron
PHP6,583.47
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -
RS Stock No. 111-3110
Mfr. Part No.K8DT-VS2TD
BrandOmron
PHP10,780.00
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. 111-3123
Mfr. Part No.K8DT-LS1CA
BrandOmron
PHP10,333.70
Each
units
Resistance 100 → 240 V ac SPDT - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 819-3214
Mfr. Part No.K8AK-AS3 24VAC/DC
BrandOmron
PHP6,392.81
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 111-3111
Mfr. Part No.K8DT-VS3CA
BrandOmron
PHP11,151.40
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. 111-3098
Mfr. Part No.K8DT-AS3TD
BrandOmron
PHP10,780.00
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 819-3239
Mfr. Part No.K8AK-AW2 24VAC/DC
BrandOmron
PHP6,583.47
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 5A - - - - -
RS Stock No. 819-3286
Mfr. Part No.K8AK-VS2 24VAC/DC
BrandOmron
PHP6,353.91
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. 111-3124
Mfr. Part No.K8DT-LS1CD
BrandOmron
PHP10,333.70
Each
units
Resistance 24 V ac/dc SPDT - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 111-3126
Mfr. Part No.K8DT-LS1TD
BrandOmron
PHP10,333.70
Each
units
Resistance 24 V ac/dc SPST - 3 - - - - - 0.1 → 10 s - - -