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. 819-3254
Mfr. Part No.K8AKPH1200500VAC
BrandOmron
HK$551.58
Each
units
Phase 200 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1 s - - -
RS Stock No. 819-3286
Mfr. Part No.K8AK-VS2 24VAC/DC
BrandOmron
HK$908.37
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. 819-3201
Mfr. Part No.K8AK-AS1 100-240VAC
BrandOmron
HK$822.25
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2 500mA - - - - -
RS Stock No. 819-3305
Mfr. Part No.K8AK-VW3 100-240VAC
BrandOmron
HK$980.47
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. 819-3208
Mfr. Part No.K8AK-AS2 100-240VAC
BrandOmron
HK$822.25
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 8A - - - - -
RS Stock No. 819-3226
Mfr. Part No.K8AK-AW1 24VAC/DC
BrandOmron
HK$995.60
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 2 500mA - - - - -
RS Stock No. 819-3292
Mfr. Part No.K8AK-VW2 100-240VAC
BrandOmron
HK$921.25
Each
units
Voltage 100 → 240 V ac 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. 111-3102
Mfr. Part No.K8DT-AW1TD
BrandOmron
HK$800.25
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. 111-3089
Mfr. Part No.K8DT-AS1TA
BrandOmron
HK$820.07
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. 111-3127
Mfr. Part No.K8DT-TH1CA
BrandOmron
HK$937.93
Each
units
Temperature 100 → 240 V ac SPDT - - - - - - - - Overtemperature 0 → +999°C -
RS Stock No. 819-3289
Mfr. Part No.K8AK-TH12S 24VAC/DC
BrandOmron
HK$933.35
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - 100 ms Overtemperature 0 → 10 -
RS Stock No. 111-3092
Mfr. Part No.K8DT-AS2CD
BrandOmron
HK$843.01
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. 111-3093
Mfr. Part No.K8DT-AS2TA
BrandOmron
HK$820.07
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. 111-3135
Mfr. Part No.K8DT-PH1CN
BrandOmron
HK$483.34
Each
units
Phase 200 → 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 111-3087
Mfr. Part No.K8DT-AS1CA
BrandOmron
HK$843.34
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. 819-3232
Mfr. Part No.K8AK-AW3 100-240VAC
BrandOmron
HK$846.45
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10 200A - - - - -
RS Stock No. 111-3139
Mfr. Part No.K8DT-PZ2CN
BrandOmron
HK$891.91
Each
units
Phase, Voltage 380 V ac, 400 V ac, 415 V ac, 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence 250 ms - - -
RS Stock No. 111-3098
Mfr. Part No.K8DT-AS3TD
BrandOmron
HK$779.06
Each
units
Current 24 V ac/dc SPST - 1 - Overcurrent, Undercurrent 10 A, 20 A 100 A, 200 A - 250 ms - - -
RS Stock No. 819-3220
Mfr. Part No.K8AK-AW2 100-240VAC
BrandOmron
HK$846.45
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1 5A - - - - -
RS Stock No. 111-3137
Mfr. Part No.K8DT-PM2CN
BrandOmron
HK$840.95
Each
units
Phase, Voltage 380 V ac, 400 V ac, 415 V ac, 480 V ac SPDT Overvoltage, Undervoltage 3 - - - - Phase Loss, Phase Sequence 250 ms - - -