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 and 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
£50.95
Each
Units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
£50.95
Each
Units
Level Control 24 V ac/dc SPDT - - - - - - - - - - -
RS Stock No. 819-3208
Mfr. Part No.K8AK-AS2 100-240VAC
BrandOmron
£82.15
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 8A - - - - -
RS Stock No. 819-3251
Mfr. Part No.K8AKPA2380480VAC
BrandOmron
£93.80
Each
Units
Phase 220 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.1 → 30 s - - -
RS Stock No. 819-3289
Mfr. Part No.K8AK-TH12S 24VAC/DC
BrandOmron
£93.25
Each
Units
Temperature 24 V ac/dc SPDT - - - - - - - 100 ms Overtemperature 0 → 10°C -
RS Stock No. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
£101.90
Each
Units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 819-3254
Mfr. Part No.K8AKPH1200500VAC
BrandOmron
£50.95
Each
Units
Phase 200 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1 s - - -
RS Stock No. 819-3273
Mfr. Part No.K8AK-TH11S 100-240VAC
BrandOmron
£93.25
Each
Units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 999°C -
RS Stock No. 819-3217
Mfr. Part No.K8AK-AS2 24VAC/DC
BrandOmron
£82.15
Each
Units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 8A - - - - -
RS Stock No. 819-3286
Mfr. Part No.K8AK-VS2 24VAC/DC
BrandOmron
£81.65
Each
Units
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 15 → 150 V ac/dc, 3 → 30 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 819-3302
Mfr. Part No.K8AK-VW2 24VAC/DC
BrandOmron
£92.05
Each
Units
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 15 → 150 V ac/dc, 3 → 30 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 819-3305
Mfr. Part No.K8AK-VW3 100-240VAC
BrandOmron
£92.05
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. 819-3201
Mfr. Part No.K8AK-AS1 100-240VAC
BrandOmron
£82.15
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -
RS Stock No. 819-3309
Mfr. Part No.K8AK-VW3 24VAC/DC
BrandOmron
£92.05
Each
Units
Voltage 24 V ac/dc 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. 111-3135
Mfr. Part No.K8DT-PH1CN
BrandOmron
£48.28
Each
Units
Phase 200 → 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 819-3210
Mfr. Part No.K8AK-AS3 100-240VAC
BrandOmron
£82.15
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
£76.43
Each
Units
Phase 115 → 240 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 111-3110
Mfr. Part No.K8DT-VS2TD
BrandOmron
£80.35
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. 819-3232
Mfr. Part No.K8AK-AW3 100-240VAC
BrandOmron
£84.60
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 111-3093
Mfr. Part No.K8DT-AS2TA
BrandOmron
£80.90
Each
Units
Current 100 → 240 V ac SPST - 1 - Overcurrent, Undercurrent 0.1 A, 0.5 A 1 A, 5 A - 250 ms - - -