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 358-6901
Tillv. art.nrIK9271.11 AC220-240V 0.1-15A Tv=0.1-20S
VarumärkeDold
1 713,37 kr
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Current 220 → 240 V ac SPDT - 1 - Undercurrent 0.1A 15A - 0.1 → 20 s - - -
RS-artikelnummer 358-7049
Tillv. art.nrIK9169.11 3AC380-415/220-240V
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758,77 kr
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Phase 220 → 240 V ac, 380 → 415 V ac SPDT - 3 - - - - Phase Failure - - - -
RS-artikelnummer 327-7679
Tillv. art.nrIK9179.11 3AC50/60Hz 400V
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784,45 kr
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Phase 400 V ac SPDT - 3 - - - - Phase Sequence - - - -
RS-artikelnummer 240-9320
Tillv. art.nrBA9053/410 AC1A/5A/10A AC230V 0-20S
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2 293,42 kr
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Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS-artikelnummer 181-2790
Tillv. art.nrMK9837N.12 5-600Hz UH=AC230V
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2 097,57 kr
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Frequency 230 V ac DPDT - - 15 → 280 V ac, 30 → 550 V ac - - - - 0 → 100 s, 0 → 50 s - - 5 → 600 Hz
RS-artikelnummer 465-0700
Tillv. art.nrMK9163N.12/100 AC50/60Hz 230V
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802,64 kr
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Temperature 230 V ac DPDT - - - - - - - - Overtemperature - -
RS-artikelnummer 656-6253
Tillv. art.nrIK9143.11 AC50/60Hz 230V Hyst.0.5-10%
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1 198,61 kr
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Frequency 230 V ac SPDT - - - - - - - - - - Maximum of 60 Hz
RS-artikelnummer 410-5963
Tillv. art.nrIK9094.11 AC/DC24V 0-150°C
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1 062,70 kr
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Temperature 24 V ac/dc SPDT - - - - - - - - Overtemperature 0 → +150°C -
RS-artikelnummer 656-6247
Tillv. art.nrIK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
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1 516,46 kr
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Speed 24 V dc SPDT - - - - - - - 0.1 → 20 s - - -
RS-artikelnummer 240-8973
Tillv. art.nrMK9052.11 DC24V
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1 108,71 kr
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Thermistor 24 V dc SPDT - - - - - - - - - - -
RS-artikelnummer 181-2782
Tillv. art.nrLH5946.48/61 20-400mV UH=DC24V 0,2-6s
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5 779,03 kr
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Standstill 24 V dc 3NO/NC - - 20 → 400 mV - - - - 0.2 → 6 s - - -
RS-artikelnummer 240-8844
Tillv. art.nrBD5936.17 AC50/60Hz 230V
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3 071,45 kr
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Standstill 230 V DPDT - - - - - - - - - - -
RS-artikelnummer 656-6180
Tillv. art.nrIN9017/100 0-10V AC230V 300W
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2 673,33 kr
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Phase 230 V ac - - - - - - - - 200 ms - - -
RS-artikelnummer 445-9052
Tillv. art.nrIL5881.12/100 DC12-280V 5-200kOHM
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2 218,50 kr
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Voltage 12 → 280 V dc DPDT - - - - - - - 0.5 → 20 s - - -
RS-artikelnummer 181-2784
Tillv. art.nrLH5946.48/61 0,2-4V UH=DC24V 0,2-6s
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5 779,03 kr
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Standstill 24 V dc 3NO/NC - - 0.2 → 4 V - - - - 0.2 → 6 s - - -
RS-artikelnummer 240-8923
Tillv. art.nrBA9041 3AC50Hz 400V
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1 636,32 kr
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Phase 400 V ac DPDT - 3 - - - - Phase Sequence <50 ms - - -
RS-artikelnummer 358-6973
Tillv. art.nrIL9277.12 AC220-240V 0.1-15A Tv=0.1-20S
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2 333,01 kr
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Current 220 → 240 V ac DPDT - 1 - Overcurrent, Undercurrent 0.1A 15A - 0.1 → 20 s - - -
RS-artikelnummer 181-2789
Tillv. art.nrMK9055N.38/500
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2 097,57 kr
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Speed - - - - - - - - - - - - -
RS-artikelnummer 181-2803
Tillv. art.nrMK7830N.82 AC/DC24V+AC230V 0,02s-9999h
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1 630,97 kr
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Multifunction 24 V ac/dc, 230 V ac DPDT - - 250 V - - - - 0.02 s → 9999 h - - -
RS-artikelnummer 358-6951
Tillv. art.nrIK9178 3AC50/60Hz 400V
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552,21 kr
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Phase 400 V ac - - - - - - - Phase Sequence - - - -