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庫存編號 518-7168
製造零件編號3UG4622-1AW30
BrandSiemens
HK$1,434.46
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -
RS庫存編號 518-7174
製造零件編號3UG4615-1CR20
BrandSiemens
HK$2,277.50
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS庫存編號 518-7297
製造零件編號3UG4513-1BR20
BrandSiemens
HK$1,642.99
單位
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS庫存編號 518-7124
製造零件編號3UG4621-1AW30
BrandSiemens
HK$1,783.33
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -
RS庫存編號 518-7275
製造零件編號3UG4511-1BP20
BrandSiemens
HK$843.90
單位
Phase - DPDT - 3 - - - - Phase Sequence - - - -
RS庫存編號 518-7051
製造零件編號3UG4614-1BR20
BrandSiemens
HK$1,761.84
單位
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS庫存編號 758-6924
製造零件編號3UG4512-1AR20
BrandSiemens
HK$1,063.55
單位
Phase - SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - -
RS庫存編號 175-2274
製造零件編號3RN2010-1BW30
BrandSiemens
HK$1,023.80
單位
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
全新
RS庫存編號 211-0170
製造零件編號3UG4651-1AA30
BrandSiemens
HK$2,438.65
單位
Speed - SPDT Overvoltage - - - - - - - - - -
RS庫存編號 175-2290
製造零件編號3RN2012-2BW31
BrandSiemens
HK$1,941.39
單位
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS庫存編號 175-2275
製造零件編號3RN2010-1CA30
BrandSiemens
HK$876.83
單位
Thermistor motor temperature protection - SPDT Motor Voltage - - - - - - - - - -
全新
RS庫存編號 210-3508
製造零件編號3UG4501-1AA30
BrandSiemens
HK$1,117.27
單位
Voltage - SPDT - - - - - - - - - - -
RS庫存編號 175-2291
製造零件編號3RN2013-1BA30
BrandSiemens
HK$1,987.44
單位
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS庫存編號 772-1215
製造零件編號5SV8000-6KK
BrandSiemens
HK$2,245.27
單位
Current - - - - - Residual 30mA 5A - 0.02 → 5s - - -
RS庫存編號 860-8693
製造零件編號5TT3421
BrandSiemens
HK$784.23
單位
- - - - - - - - - - - - - -
RS庫存編號 175-2276
製造零件編號3RN2010-1CW30
BrandSiemens
HK$971.16
單位
Thermistor motor temperature protection - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS庫存編號 175-2284
製造零件編號3RN2011-2BW30
BrandSiemens
HK$1,213.95
單位
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS庫存編號 518-7102
製造零件編號3UG4632-1AA30
BrandSiemens
HK$1,643.67
單位
Voltage - SPDT Overvoltage, Undervoltage 1 10 → 600V ac/dc - - - - 0.1 → 20s - - -
全新
RS庫存編號 211-0171
製造零件編號3UG4815-1AA40
BrandSiemens
HK$2,470.88
單位
Phase - SPDT - 3 - - - - - - - - -
RS庫存編號 203-3897
製造零件編號3UG4582-1AW30
BrandSiemens
HK$3,620.37
單位
Voltage - SPNO - - - - - - - - - - -