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 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 Current Range
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
£170.53
Each
Units
Voltage DPDT Undervoltage - - - - - - - - - - -
RS Stock No. 445-9052
Mfr. Part No.IL5881.12/100 DC12-280V 5-200kOHM
BrandDold
£170.87
Each
Units
Voltage DPDT - - - - - - - 0.5 → 20s - - - -
RS Stock No. 291-3144
Mfr. Part No.IL9077.12 3/NAC 400/230V 0.1-20S
BrandDold
£179.61
Each
Units
Voltage DPDT Overvoltage, Undervoltage 3 - - - - - 0.1 → 20s - - - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
£176.64
Each
Units
Current SPDT - - - - 0.1A 10A - 0.5 → 5s - - - 0.1 → 1 A, 0.5 → 5 A, 1 → 10A
RS Stock No. 500-3515
Mfr. Part No.MK9163N.12/110 ATEX AC/DC24V
BrandDold
£65.61
Each
Units
Temperature DPDT - - - - - - - - Overtemperature - - -
RS Stock No. 240-8967
Mfr. Part No.BD9080.12 3AC400V UH=AC230V
BrandDold
£251.97
Each
Units
Phase, Voltage DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 5s - - - -
RS Stock No. 240-8844
Mfr. Part No.BD5936.17 AC50/60Hz 230V
BrandDold
£236.57
Each
Units
Standstill DPDT - - - - - - - - - - - -
RS Stock No. 240-8923
Mfr. Part No.BA9041 3AC50Hz 400V
BrandDold
£126.03
Each
Units
Phase DPDT - 3 - - - - Phase Sequence <50ms - - - -
RS Stock No. 445-9068
Mfr. Part No.IL5880.12 AC50-400Hz 220-240V 5-100kOHM
BrandDold
£160.56
Each
Units
Voltage DPDT - 1, 3 0 → 500V ac - - - - <1.3s - - - -
RS Stock No. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
£116.81
Each
Units
Speed SPDT - - - - - - - 0.1 → 20s - - - -
RS Stock No. 240-8995
Mfr. Part No.MK9052.11 AC50/60Hz 230V
BrandDold
£84.13
Each
Units
Thermistor SPDT - - - - - - - <20ms - - - -
RS Stock No. 240-8945
Mfr. Part No.BA9043/001 3AC50-400Hz 400V
BrandDold
£170.53
Each
Units
Voltage DPDT Undervoltage 3 - - - - - - - - - -
RS Stock No. 240-8973
Mfr. Part No.MK9052.11 DC24V
BrandDold
£84.13
Each
Units
Thermistor SPDT - - - - - - - - - - - -
RS Stock No. 358-7049
Mfr. Part No.IK9169.11 3AC380-415/220-240V
BrandDold
£57.58
Each
Units
Phase SPDT - 3 - - - - Phase Failure - - - - -
RS Stock No. 291-3150
Mfr. Part No.IL9079.12/002 3AC230/400V 0.55-1.05UN 0.2-2S
BrandDold
£179.52
Each
Units
Voltage DPDT Undervoltage 3 - - - - - 0.2 → 2s - - - -
RS Stock No. 465-0687
Mfr. Part No.IK8702.01 AC50/60Hz 230V
BrandDold
£40.69
Each
Units
Current SPST - - - - - - - >=30ms - - - -
RS Stock No. 240-9033
Mfr. Part No.AI897 AC45-400Hz230V 10-80kOhm
BrandDold
£175.25
Each
Units
Voltage SPDT - 1, 3 0.8 → 1.1 - - - - <4.2s - - - -
RS Stock No. 500-3537
Mfr. Part No.MK9163N.12/110 ATEX AC50/60Hz 230V
BrandDold
£65.61
Each
Units
Temperature DPDT - - - - - - - <100ms Overtemperature - - -
RS Stock No. 445-9074
Mfr. Part No.BH9097.38/001 3AC400V AC40A
BrandDold
£306.48
Each
Units
Phase SPDT - 3 - - - - - 0 → 10s - - - -
RS Stock No. 465-0665
Mfr. Part No.MK9053N.12/012 AC0.5-5A
BrandDold
£186.53
Each
Units
Current DPDT - - - Undercurrent 0.5A 5A - 0 → 20s - - - 0.5 → 5A