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
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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 465-0659
Tillv. art.nrMK9053N.12/010 AC0.5-5A
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2 458,23 kr
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Current 230 V ac DPDT - - - Overcurrent 0.5A 5A - 0 → 20 s - - -
RS-artikelnummer 240-9049
Tillv. art.nrAI898 DC24V 6kOhm UH=AC45-400Hz 230V
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3 396,79 kr
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Voltage 24 V dc SPDT - - 0.8 → 1.1 - - - - 0.4 s - - -
RS-artikelnummer 656-6269
Tillv. art.nrIL9837.11 5-200Hz UH=230V
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1 913,50 kr
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Frequency 230 V ac SPDT - - - - - - - 0.1 → 20 s - - 5 → 200 Hz
RS-artikelnummer 500-3408
Tillv. art.nrMK9163N.12/100 AC/DC24V
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802,64 kr
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Temperature 24 V ac/dc DPDT - - - - - - - - Overtemperature - -
RS-artikelnummer 327-7641
Tillv. art.nrIL9151.12 2-450kOHM AC230V 0.2-20S
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1 637,39 kr
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- - - - - - - - - - - - - -
RS-artikelnummer 181-2769
Tillv. art.nrRN5883.12/61 AC/DC80-230V 10-3000mA 0-10s
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4 816,92 kr
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Residual Current 80 → 230 V ac/dc DPDT - 2 - - 10mA 3000mA - 0 → 10 s - - -
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 445-9046
Tillv. art.nrIL5882.38 AC/DC24V-230V Tv=5S
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2 600,56 kr
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Current 24 → 230 V ac/dc DPDT - - - - 10mA 10A - 0 → 5 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 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 181-2796
Tillv. art.nrMK9300N.11/022 3AC24...400V AC12A UH=DC24V
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2 487,13 kr
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Multifunction 24 V dc SPDT - 3 24 → 400 V ac - 100mA 12A - 0 → 10 s, 0.2 → 10 s - - -
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 181-2789
Tillv. art.nrMK9055N.38/500
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2 097,57 kr
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Speed - - - - - - - - - - - - -
RS-artikelnummer 181-2785
Tillv. art.nrLH5946.48/61 0,2-4V UH=AC230V 0,2-6s
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5 779,03 kr
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Standstill 230 V ac 3NO/NC - - 0.2 → 4 V - - - - 0.2 → 6 s - - -
RS-artikelnummer 181-2788
Tillv. art.nrMK9055N.12 1-120.000IPM UH=AC230V+DC24V
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2 097,57 kr
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Speed 24 V dc, 230 V ac DPDT - - - - - - - 0 → 100 s - - 0.15 → 20 Hz
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 - - -