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
1 747,64 kr
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Current - SPDT - 1 - Undercurrent 0.1A 15A - 0.1 → 20s - - -
RS-artikelnummer 240-9320
Tillv. art.nrBA9053/410 AC1A/5A/10A AC230V 0-20S
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2 339,29 kr
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Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS-artikelnummer 327-7679
Tillv. art.nrIK9179.11 3AC50/60Hz 400V
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800,14 kr
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Phase - SPDT - 3 - - - - Phase Sequence - - - -
RS-artikelnummer 358-7049
Tillv. art.nrIK9169.11 3AC380-415/220-240V
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773,95 kr
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Phase - SPDT - 3 - - - - Phase Failure - - - -
RS-artikelnummer 181-2795
Tillv. art.nrRK9871.71 3/N AC400/230V 50/60Hz
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1 041,39 kr
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Voltage - SPDT - 3 - - - - - - - - 45 → 65Hz
RS-artikelnummer 181-2796
Tillv. art.nrMK9300N.11/022 3AC24...400V AC12A UH=DC24V
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2 536,87 kr
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Multifunction - SPDT - 3 24 → 400V ac - 100mA 12A - 0 → 10 s, 0.2 → 10s - - -
RS-artikelnummer 656-6247
Tillv. art.nrIK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
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1 546,79 kr
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Speed - SPDT - - - - - - - 0.1 → 20s - - -
RS-artikelnummer 291-3150
Tillv. art.nrIL9079.12/002 3AC230/400V 0.55-1.05UN 0.2-2S
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2 377,49 kr
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Voltage - DPDT Undervoltage 3 - - - - - 0.2 → 2s - - -
RS-artikelnummer 181-2806
Tillv. art.nrMK7830N.82PC AC/DC24V + AC230V 0,02s-9999h
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1 779,30 kr
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Multifunction - DPDT - - - - - - - 0.02 s → 9999h - - -
RS-artikelnummer 465-0700
Tillv. art.nrMK9163N.12/100 AC50/60Hz 230V
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818,69 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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1 222,58 kr
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Frequency - SPDT - - - - - - - - - - Maximum of 60Hz
RS-artikelnummer 500-3537
Tillv. art.nrMK9163N.12/110 ATEX AC50/60Hz 230V
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868,91 kr
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Temperature 230 V ac DPDT - - - - - - - <100 ms Overtemperature - -
RS-artikelnummer 465-0687
Tillv. art.nrIK8702.01 AC50/60Hz 230V
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546,88 kr
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Current - SPST - - - - - - - >=30ms - - -
RS-artikelnummer 358-6951
Tillv. art.nrIK9178 3AC50/60Hz 400V
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563,25 kr
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Phase - - - - - - - - Phase Sequence - - - -
RS-artikelnummer 181-2803
Tillv. art.nrMK7830N.82 AC/DC24V+AC230V 0,02s-9999h
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1 663,59 kr
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Multifunction - DPDT - - - - - - - 0.02 s → 9999h - - -
RS-artikelnummer 656-6269
Tillv. art.nrIL9837.11 5-200Hz UH=230V
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1 951,77 kr
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Frequency - SPDT - - - - - - - 0.1 → 20s - - 5 → 200Hz
RS-artikelnummer 240-8923
Tillv. art.nrBA9041 3AC50Hz 400V
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1 669,05 kr
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Phase 400 V ac DPDT - 3 - - - - Phase Sequence <50 ms - - -
RS-artikelnummer 240-9049
Tillv. art.nrAI898 DC24V 6kOhm UH=AC45-400Hz 230V
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3 464,73 kr
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Voltage - SPDT - - 0.8 → 1.1 - - - - 0.4s - - -
RS-artikelnummer 181-2784
Tillv. art.nrLH5946.48/61 0,2-4V UH=DC24V 0,2-6s
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5 894,61 kr
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Standstill - 3NO/NC - - - - - - - 0.2 → 6s - - -
RS-artikelnummer 358-6917
Tillv. art.nrIK9168 3AC50/60Hz 230/400V
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542,53 kr
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Phase - - - - - - - - Phase Sequence - - - -