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. 794-3951
Mfr. Part No.MJ93BK
BrandGIC
£45.50
Each
Units
Thermistor DPDT - 3 - - - 6A - 100 ms, 500ms - - - Maximum of 6A
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. 146-092
Mfr. Part No.RM17JC00MW
£91.00
Each
Units
Current SPDT - - - Overcurrent 2A 20A - 0.5s - - - 2 → 20A
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
£106.84
Each
Units
Current DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - - 0.1 → 10A
RS Stock No. 609-8075
Mfr. Part No.LT3SM00ED
£336.00
Each
Units
Temperature SPDT - - - - - - - - Overtemperature, Undertemperature - - -
RS Stock No. 850-5360
Mfr. Part No.LXPRC/S 400V
£66.92
Each
Units
Phase, Voltage SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - - Maximum of 8A
RS Stock No. 518-7275
Mfr. Part No.3UG4511-1BP20
BrandSiemens
£78.21
Each
Units
Phase DPDT - 3 - - - - Phase Sequence - - - - -
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. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
£60.83
Each
Units
Phase SPST - 1, 3 - - - - NEUTRAL 150ms - - - -
RS Stock No. 321-6826
Mfr. Part No.45200 110VAC
£63.55
Each
Units
Temperature SPDT - - - - - - - 50ms Overtemperature - - -
RS Stock No. 775-7902
Mfr. Part No.1SVR730884R3300 CM-MPS.41S
BrandABB
£184.28
Each
Units
Phase, Voltage DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0s - - 45 → 65Hz -
RS Stock No. 397-9145
Mfr. Part No.70POCR 400VAC
£151.97
Each
Units
Current DPDT - 3 - Overcurrent - 5A - 0.2 → 10s - - - -
RS Stock No. 819-3248
Mfr. Part No.K8AK-LS1 24VAC/DC
BrandOmron
£52.00
Each
Units
Level Control SPDT - - - - - - - - - - - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
£145.00
Each
Units
Speed SPDT - - - - - - - 0.6 → 60s - - - -
RS Stock No. 715-7986
Mfr. Part No.2900177
£177.09
Each
Units
Current, Temperature, Voltage DPDT Overvoltage, Undervoltage 1, 3 0 → 480V ac Overcurrent, Undercurrent 0.15A 12A - 0.1 → 50s Overtemperature, Undertemperature - - 0.15 → 6 A, 0.3 → 12A
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. 794-3963
Mfr. Part No.MLD4BS
BrandGIC
£47.47
Each
Units
Thermistor SPDT - 3 - - - 5A - 2 ms, 100 ms, 360 → 550ms - - - Maximum of 5A
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
£128.44
Each
Units
Current SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - - 0.1 mA → 10A
RS Stock No. 298-9400
Mfr. Part No.45050 230VAC
£78.27
Each
Units
Voltage SPDT Overvoltage 1 0.5 → 10 V ac/dc, 3 → 60 V ac/dc, 30 → 600V ac/dc - - - - 0.1 → 3s - - - -