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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Beskrivning Pris 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-artikelnummer 518-7297
Tillv. art.nr3UG4513-1BR20
VarumärkeSiemens
1 599,60 kr
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Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS-artikelnummer 758-6924
Tillv. art.nr3UG4512-1AR20
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1 173,04 kr
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Phase - SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - -
RS-artikelnummer 518-7168
Tillv. art.nr3UG4622-1AW30
VarumärkeSiemens
1 812,88 kr
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Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -
RS-artikelnummer 518-7089
Tillv. art.nr3RS1140-1GW60
VarumärkeSiemens
4 180,29 kr
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Temperature - SPST - - - - - - - 0 → 999s Overtemperature, Undertemperature -99 → +999°C -
RS-artikelnummer 758-6942
Tillv. art.nr3UG4632-1AW30
VarumärkeSiemens
1 770,22 kr
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Voltage - SPDT Overvoltage, Undervoltage - 10 → 600V ac/dc - - - - 0.1 → 20s - - -
RS-artikelnummer 518-7124
Tillv. art.nr3UG4621-1AW30
VarumärkeSiemens
1 812,88 kr
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Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -
Nytt
RS-artikelnummer 216-3338
Tillv. art.nr3UG4511-1BQ20
VarumärkeSiemens
1 367,99 kr
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Phase - DPDT Overvoltage 3 - - - - - - - - -
RS-artikelnummer 175-2285
Tillv. art.nr3RN2012-1BA30
VarumärkeSiemens
1 610,26 kr
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Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS-artikelnummer 392-7267
Tillv. art.nr3RN1010-1CB00
VarumärkeSiemens
1 023,74 kr
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Thermistor motor protection relay - SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-artikelnummer 175-2281
Tillv. art.nr3RN2011-1BA30
VarumärkeSiemens
1 173,04 kr
Each
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Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
Nytt
RS-artikelnummer 211-0137
Tillv. art.nr3RR2243-1FA30
VarumärkeSiemens
3 568,67 kr
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Current - SPDT - 3 - - - - - - - - -
RS-artikelnummer 175-2286
Tillv. art.nr3RN2012-1BW30
VarumärkeSiemens
1 738,23 kr
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Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS-artikelnummer 518-7275
Tillv. art.nr3UG4511-1BP20
VarumärkeSiemens
1 258,35 kr
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Phase - DPDT - 3 - - - - Phase Sequence - - - -
RS-artikelnummer 175-2274
Tillv. art.nr3RN2010-1BW30
VarumärkeSiemens
1 044,01 kr
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Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
Nytt
RS-artikelnummer 213-1226
Tillv. art.nr3RR2242-2FW30
VarumärkeSiemens
2 902,52 kr
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Current - SPDT - 3 - - - - - - - - -
RS-artikelnummer 197-5369
Tillv. art.nr3LD2054-0TK53
VarumärkeSiemens
335,92 kr
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- - - - - - - - - - - - - -
Nytt
RS-artikelnummer 213-1224
Tillv. art.nr3RR2242-1FW30
VarumärkeSiemens
2 902,52 kr
Each
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Current - SPDT - 3 - - - - - - - - -
RS-artikelnummer 203-2721
Tillv. art.nr3RS1040-2GW50
VarumärkeSiemens
3 871,03 kr
Each
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Temperature - SPDT - - - - - - - - - - -
RS-artikelnummer 175-2272
Tillv. art.nr3RN2000-2AW30
VarumärkeSiemens
712,43 kr
Each
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- - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
Nytt
RS-artikelnummer 216-5988
Tillv. art.nr5TT3170
VarumärkeSiemens
1 225,24 kr
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- - - - - - - - - - - - - -