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 518-7297
製造零件編號3UG4513-1BR20
BrandSiemens
TWD5,177.00
單位
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS庫存編號 860-8693
製造零件編號5TT3421
BrandSiemens
TWD2,926.00
單位
- - - - - - - - - - - - - -
RS庫存編號 392-7267
製造零件編號3RN1010-1CB00
BrandSiemens
TWD3,835.00
單位
Thermistor motor protection relay - SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS庫存編號 518-7180
製造零件編號3UG4617-1CR20
BrandSiemens
TWD9,779.00
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS庫存編號 758-6942
製造零件編號3UG4632-1AW30
BrandSiemens
TWD4,986.00
單位
Voltage - SPDT Overvoltage, Undervoltage - 10 → 600V ac/dc - - - - 0.1 → 20s - - -
RS庫存編號 203-3903
製造零件編號3UG4621-2AW30
BrandSiemens
TWD7,054.00
單位
Current - SPDT - 1 - - - - - - - - -
全新
RS庫存編號 213-1310
製造零件編號3UG4621-1AA30
BrandSiemens
TWD6,132.00
單位
Current - SPDT Overvoltage 1 - - - - - - - - -
RS庫存編號 758-6955
製造零件編號3UG4641-1CS20
BrandSiemens
TWD9,098.00
單位
Current - DPDT - - - No Current, Overcurrent, Undercurrent 0.2A 10A - 0.1 → 20s - - -
RS庫存編號 175-2284
製造零件編號3RN2011-2BW30
BrandSiemens
TWD4,529.00
單位
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
全新
RS庫存編號 213-1311
製造零件編號3UG4622-1AA30
BrandSiemens
TWD6,132.00
單位
Current - SPDT Overvoltage 1 - - - - - - - - -
RS庫存編號 203-2227
製造零件編號5TT3401
BrandSiemens
TWD3,547.00
單位
Voltage - SPDT - 3 - - - - - - - - -
RS庫存編號 175-2271
製造零件編號3RN2000-2AA30
BrandSiemens
TWD2,521.00
單位
Thermistor motor temperature protection - SPDT Motor Voltage - - - - - - - - - -
RS庫存編號 518-7102
製造零件編號3UG4632-1AA30
BrandSiemens
TWD6,132.00
單位
Voltage - SPDT Overvoltage, Undervoltage 1 10 → 600V ac/dc - - - - 0.1 → 20s - - -
RS庫存編號 175-2285
製造零件編號3RN2012-1BA30
BrandSiemens
TWD5,891.00
單位
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
全新
RS庫存編號 211-0137
製造零件編號3RR2243-1FA30
BrandSiemens
TWD12,023.00
單位
Current - SPDT - 3 - - - - - - - - -
RS庫存編號 175-2294
製造零件編號3RN2013-2BA30
BrandSiemens
TWD7,414.00
單位
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS庫存編號 175-2272
製造零件編號3RN2000-2AW30
BrandSiemens
TWD2,761.00
單位
- - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS庫存編號 175-2279
製造零件編號3RN2010-2CA30
BrandSiemens
TWD3,202.00
單位
Thermistor motor temperature protection - SPDT Motor Voltage - - - - - - - - - -
全新
RS庫存編號 213-1315
製造零件編號3UG4633-2AL30
BrandSiemens
TWD6,653.00
單位
Voltage - SPDT Overvoltage 1 - - - - - - - - -
RS庫存編號 518-7124
製造零件編號3UG4621-1AW30
BrandSiemens
TWD6,653.00
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -