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. 102-6134
BrandRS PRO
£76.13
Each
Units
Current SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30s - - 48 → 63Hz 1 → 10A
RS Stock No. 102-6130
BrandRS PRO
£39.28
Each
Units
Voltage SPDT Undervoltage 1 12 → 24V dc - - - - 0 → 30s - - - -
RS Stock No. 102-6135
BrandRS PRO
£41.25
Each
Units
Phase, Voltage SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 100ms - - 48 → 63Hz -
RS Stock No. 102-6133
BrandRS PRO
£76.13
Each
Units
Voltage SPDT Overvoltage, Undervoltage 1 - - - - - 0.1 → 30s - - 48 → 63Hz -
RS Stock No. 102-6137
BrandRS PRO
£55.92
Each
Units
Phase, Voltage SPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 102-6131
BrandRS PRO
£43.23
Each
Units
Voltage SPDT Overvoltage, Undervoltage 1 - - - - - 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 102-6136
BrandRS PRO
£43.25
Each
Units
Phase, Voltage SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
£80.00
Each
Units
Phase DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - - 10mA
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
£170.53
Each
Units
Voltage DPDT Undervoltage - - - - - - - - - - -
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
£96.73
Each
Units
Voltage SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
£99.42
Each
Units
Phase, Voltage DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
£194.00
Each
Units
Phase, Voltage DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - - -
RS Stock No. 347-696
Mfr. Part No.FSRST30SLP-110/230VAC
BrandTempatron
£71.45
Each
Units
Shaft Rotation Sensor SPDT - - Maximum of 30V dc - - - - 1 → 30s - - 50 → 60Hz Maximum of 5A
RS Stock No. 850-5370
Mfr. Part No.LXPRT 280-520VAC
£52.94
Each
Units
Phase, Voltage SPDT Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - - Maximum of 8A
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
£124.00
Each
Units
Current DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - - 150 mA → 15A
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
£66.00
Each
Units
Level DPDT - 1 - - - - - 0.1 → 5s - - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
£112.68
Each
Units
Current SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - - 0.05 → 10A
RS Stock No. 146-597
Mfr. Part No.RM17TU00
£93.00
Each
Units
Phase, Voltage SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
£37.78
Each
Units
Current SPST - 1 - Overcurrent - - - <300ms - - - 2 → 20A
RS Stock No. 518-6070
Mfr. Part No.817-E1
£82.50
Each
Units
Temperature DPST - - - - - - - - Overtemperature - - -