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

  • 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. 124-0193
Mfr. Part No.RM35LM33MW
HK$1,292.83
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
HK$1,841.60
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
HK$1,364.71
Each
units
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
HK$1,057.49
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 146-200
Mfr. Part No.RM35JA31MW
HK$1,565.88
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30s - - -
RS Stock No. 146-171
Mfr. Part No.RM17UAS15
HK$1,460.13
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
HK$3,296.22
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 146-193
Mfr. Part No.RM35HZ21FM
HK$2,108.57
Each
units
Frequency - DPDT - - - - - - - 0.1 → 10s - - 40 → 70Hz
RS Stock No. 146-086
Mfr. Part No.RM35BA10
HK$2,848.28
Each
units
Current, Phase - SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 144-462
Mfr. Part No.15543
HK$1,195.12
Each
units
- - SPDT - - - - - - - - - - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
HK$2,152.32
Each
units
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS Stock No. 146-187
Mfr. Part No.RM35UA13MW
HK$1,587.09
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
New
RS Stock No. 212-0282
Mfr. Part No.LV481004
HK$10,629.95
Each
units
Current - - - - - - - - - - - - -
RS Stock No. 124-0187
Mfr. Part No.RM22UA32MR
HK$949.73
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 1 → 100V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 124-0179
Mfr. Part No.RM22JA31MR
HK$2,928.46
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 4mA 1A - 0.1 → 30s - - -
RS Stock No. 146-608
Mfr. Part No.RM17TT00
HK$1,349.07
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 146-519
Mfr. Part No.RM17UBE15
HK$1,503.80
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 124-0188
Mfr. Part No.RM22UA33MR
HK$1,050.30
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 15 → 500V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 124-0184
Mfr. Part No.RM22TR33
HK$1,281.96
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 380 → 480V ac - - - Phase Failure, Phase Sequence 0.1 → 30s - - 50 → 60Hz
RS Stock No. 204-8274
Mfr. Part No.TPRPM009
HK$690.54
Each
units
Voltage - - - 3 - - - - - - - - -