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. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
PHP14,904.52
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 418-4988
Mfr. Part No.3RS1040-1GW50
BrandSiemens
PHP16,525.91
Each
units
Temperature - DPDT - - - - - - - 0 → 999s Overtemperature, Undertemperature -50 → +500°C -
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
PHP7,733.48
Each
units
Phase - SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
PHP10,058.90
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
PHP10,111.88
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
PHP7,928.65
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -
RS Stock No. 772-1215
Mfr. Part No.5SV8000-6KK
BrandSiemens
PHP13,014.14
Each
units
Current - - - - - Residual 30mA 5A - 0.02 → 5s - - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
PHP11,322.05
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 758-6933
Mfr. Part No.3UG4614-2BR20
BrandSiemens
PHP12,303.26
Each
units
Phase - DPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 518-7180
Mfr. Part No.3UG4617-1CR20
BrandSiemens
PHP17,154.26
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 175-2272
Mfr. Part No.3RN2000-2AW30
BrandSiemens
PHP4,197.03
Each
units
- - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
New
RS Stock No. 211-0172
Mfr. Part No.3UG4815-2AA40
BrandSiemens
PHP16,308.61
Each
units
Phase - SPDT - 3 - - - - - - - - -
RS Stock No. 203-3945
Mfr. Part No.3UG4512-2AR20
BrandSiemens
PHP7,066.12
Each
units
Phase - SPDT - 3 - - - - - - - - -
New
RS Stock No. 211-0140
Mfr. Part No.3RS1440-1HB50
BrandSiemens
PHP24,877.55
Each
units
Temperature - 3CO - - - - - - - - - - -
RS Stock No. 197-3311
Mfr. Part No.3UG5461-1AA40
BrandSiemens
PHP46,161.67
Each
units
DC load - DPNC - 3 - - - - - - - - -
RS Stock No. 203-3898
Mfr. Part No.3UG4616-1CR20
BrandSiemens
PHP15,686.68
Each
units
Voltage - DPDT - 3 - - - - - - - - -
New
RS Stock No. 213-1327
Mfr. Part No.5SV8200-6KK
BrandSiemens
PHP28,816.49
Each
units
Current - - Overvoltage - - - - - - - - - -
RS Stock No. 203-3985
Mfr. Part No.3UG4581-1AW30
BrandSiemens
PHP18,105.33
Each
units
Voltage - SPNO - 3 - - - - - - - - -
RS Stock No. 175-2283
Mfr. Part No.3RN2011-2BA30
BrandSiemens
PHP7,522.56
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
New
RS Stock No. 213-1302
Mfr. Part No.3UG4512-1BR20
BrandSiemens
PHP8,845.35
Each
units
Phase - DPDT Overvoltage 3 - - - - - - - - -