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
PHP6,260.08
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
PHP6,848.11
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
PHP6,268.46
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - 100 ms Overtemperature 0 → 10 -
RS Stock No. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
PHP7,801.88
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 819-3220
Mfr. Part No.K8AK-AW2 100-240VAC
BrandOmron
PHP6,479.02
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 5A - - - - -
RS Stock No. 111-3091
Mfr. Part No.K8DT-AS2CA
BrandOmron
PHP6,370.88
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
PHP7,140.45
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 10 -
RS Stock No. 819-3201
Mfr. Part No.K8AK-AS1 100-240VAC
BrandOmron
PHP6,291.27
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2 500mA - - - - -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
PHP3,424.94
Each
units
Level Control 24 V ac/dc SPDT - - - - - - - - - - -
RS Stock No. 819-3264
Mfr. Part No.K8AKPW2380480VAC
BrandOmron
PHP7,695.87
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
PHP6,479.02
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 2 500mA - - - - -
RS Stock No. 819-3251
Mfr. Part No.K8AKPA2380480VAC
BrandOmron
PHP7,183.72
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.1 → 30 s - - -
RS Stock No. 111-3117
Mfr. Part No.K8DT-VW2TA
BrandOmron
PHP6,920.84
Each
units
Voltage 100 → 240 V ac SPST Overvoltage, Undervoltage 1 1 → 10 V, 15 → 150 V, 3 → 30 V - - - - 250 ms - - -
RS Stock No. 111-3106
Mfr. Part No.K8DT-AW2TD
BrandOmron
PHP6,370.88
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. 111-3126
Mfr. Part No.K8DT-LS1TD
BrandOmron
PHP4,028.03
Each
units
Resistance 24 V ac/dc SPST - 3 - - - - - 0.1 → 10 s - - -
RS Stock No. 111-3104
Mfr. Part No.K8DT-AW2CD
BrandOmron
PHP6,546.19
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. 819-3210
Mfr. Part No.K8AK-AS3 100-240VAC
BrandOmron
PHP6,291.27
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10 200A - - - - -
RS Stock No. 819-3254
Mfr. Part No.K8AKPH1200500VAC
BrandOmron
PHP3,424.94
Each
units
Phase 200 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1 s - - -
RS Stock No. 111-3118
Mfr. Part No.K8DT-VW2TD
BrandOmron
PHP6,920.84
Each
units
Voltage 24 V ac/dc SPST Overvoltage, Undervoltage 1 1 → 10 V, 15 → 150 V, 3 → 30 V - - - - 250 ms - - -
RS Stock No. 111-3092
Mfr. Part No.K8DT-AS2CD
BrandOmron
PHP6,370.88
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -