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. 102-6134
BrandRS PRO
£69.83
Each
Units
Current 24 → 230 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30 s - - 48 → 63 Hz
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
£122.00
Each
Units
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
£110.02
Each
Units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
£37.78
Each
Units
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
£70.25
Each
Units
Current, Voltage 115/230 V ac SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500 V dc Overcurrent - - - <300 ms - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
£87.19
Each
Units
Current 24 → 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
RS Stock No. 146-200
Mfr. Part No.RM35JA31MW
£100.70
Each
Units
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30 s - - -
RS Stock No. 850-5392
Mfr. Part No.LMCCR-10A 24-230VAC/DC
£82.70
Each
Units
Current 24 → 230 V ac/dc SPDT - - - Overcurrent, Undercurrent 0.2A 10A - 0.1 → 30 s - - -
RS Stock No. 124-0191
Mfr. Part No.RM35JA32MR
£123.50
Each
Units
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30 s - - -
RS Stock No. 146-092
Mfr. Part No.RM17JC00MW
£91.00
Each
Units
Current 24 → 240 V ac/dc SPDT - - - Overcurrent 2A 20A - 0.5 s - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
£103.02
Each
Units
Current 24 → 240 V ac/dc DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
£170.62
Each
Units
Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS Stock No. 397-9145
Mfr. Part No.70POCR 400VAC
£151.97
Each
Units
Current 400 V ac DPDT - 3 - Overcurrent - 5A - 0.2 → 10 s - - -
RS Stock No. 715-7986
Mfr. Part No.2900177
£171.93
Each
Units
Current, Temperature, Voltage 110 → 500 V ac DPDT Overvoltage, Undervoltage 1, 3 0 → 480 V ac Overcurrent, Undercurrent 0.15A 12A - 0.1 → 50 s Overtemperature, Undertemperature - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
£123.85
Each
Units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
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. 463-3402
Mfr. Part No.84871030
BrandCrouzet
£124.36
Each
Units
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 758-6955
Mfr. Part No.3UG4641-1CS20
BrandSiemens
£150.46
Each
Units
Current 90 → 690 V ac DPDT - - - No Current, Overcurrent, Undercurrent 0.2A 10A - 0.1 → 20 s - - -
RS Stock No. 146-086
Mfr. Part No.RM35BA10
£174.00
Each
Units
Current, Phase 208 → 480 V ac, 230 V ac SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 538-3805
Mfr. Part No.P48SMP 1-30SEC 115/230VAC
£63.29
Each
Units
Current 115 V ac, 230 V ac SPDT - - - - - - - 1 → 30 s, 2 → 60 s - - -