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 884-2473
Tillv. art.nrMAC04D0100
VarumärkeGIC
451,28 kr
Each
Enheter
Phase, Voltage 415 V ac DPDT Overvoltage Protection, Undervoltage Protection 3 - - - - Neutral Loss, Phase Failure, Phase Reversal, Phase Sequence, Phase Symmetry 5 (Over Voltage) s, 5 (Phase Failure) s, 5 (Phase Imbalance) s, 5 (Under Voltage) s, 500 ms → 1 s (Neutral Loss) - - 47 → 53 Hz
RS-artikelnummer 146-165
Tillv. art.nrRM17UAS14
VarumärkeSchneider Electric
1 151,40 kr
Each
Enheter
Voltage 12 V SPDT Overvoltage, Self Powered, Undervoltage 1 9 → 15 V dc - - - - 0.1 → 10 s - - -
RS-artikelnummer 794-3945
Tillv. art.nrMI81BL
VarumärkeGIC
384,31 kr
Each
Enheter
Frequency 110 → 240 V ac SPDT - 1 - - - 6A - 100 ms, 500 ms - - -
RS-artikelnummer 518-7297
Tillv. art.nr3UG4513-1BR20
VarumärkeSiemens
1 205,87 kr
Each
Enheter
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS-artikelnummer 916-0088
Tillv. art.nrPMV10A440
VarumärkeLovato
1 034,12 kr
Each
Enheter
Voltage 208 → 480 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 60 ms - - -
RS-artikelnummer 775-8015
Tillv. art.nr1SVR730841R1400
VarumärkeABB
1 676,26 kr
Each
Enheter
Current 220 → 240 V ac DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS-artikelnummer 614-9397
Tillv. art.nr84871130
VarumärkeCrouzet
1 218,88 kr
Each
Enheter
Current 24 → 240 V ac/dc DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS-artikelnummer 859-3027
Tillv. art.nrDUA52C724
VarumärkeCarlo Gavazzi
1 136,11 kr
Each
Enheter
Voltage 12 → 24 V dc SPDT Undervoltage - 8 → 28 V dc - - - - <200 ms - - -
RS-artikelnummer 857-7662
Tillv. art.nrDPA51CM44
VarumärkeCarlo Gavazzi
1 572,81 kr
Each
Enheter
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS-artikelnummer 850-5360
Tillv. art.nrLXPRC/S 400V
VarumärkeBroyce Control
755,28 kr
Each
Enheter
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage - 300 → 380 (Under) V, 420 → 500 (Over) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
RS-artikelnummer 857-7416
Tillv. art.nrPPA01CM44
VarumärkeCarlo Gavazzi
1 088,15 kr
Each
Enheter
Phase, Voltage 208 → 480 V ac SPDT - 3 177 → 475 V ac - - - Phase Loss, Phase Sequence - - - -
RS-artikelnummer 347-696
Tillv. art.nrFSRST30SLP-110/230VAC
VarumärkeTempatron
839,50 kr
Each
Enheter
Shaft Rotation Sensor 110 V ac, 230 V ac SPDT - - Maximum of 30 V dc - - - - 1 → 30 s - - 50 → 60 Hz
RS-artikelnummer 146-238
Tillv. art.nrRM17TG20
VarumärkeSchneider Electric
673,16 kr
Each
Enheter
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS-artikelnummer 146-446
Tillv. art.nrRM35TM50MW
VarumärkeSchneider Electric
1 739,88 kr
Each
Enheter
Phase, Temperature, Voltage 24 → 240 V ac/dc DPST Motor Voltage 3 208 → 480 V ac - - - Phase Failure, Phase Sequence 0.3 s Overtemperature, Undertemperature - -
RS-artikelnummer 629-386
Tillv. art.nrM3PPI 300-500vAC
VarumärkeBroyce Control
505,10 kr
Each
Enheter
Phase 300 → 500 V ac - - 3 - - - - Phase Loss, Phase Sequence - - - -
RS-artikelnummer 794-3941
Tillv. art.nrMG21DH
VarumärkeGIC
386,33 kr
Each
Enheter
Voltage 208 → 480 V ac SPDT Overvoltage, Undervoltage 3 - - - 5A - 0.5 → 15 s, 5 s - - -
RS-artikelnummer 914-3945
Tillv. art.nrECPF03
VarumärkeRelpol
233,75 kr
Each
Enheter
Phase, Voltage 220 → 460 V SPDT Overvoltage, Undervoltage 3 45 → 65 Hz, 176 → 552 V - - - Phase Failure, Phase Sequence - - - -
RS-artikelnummer 776-1594
Tillv. art.nr72.01.9.024.0000
VarumärkeFinder
558,67 kr
Each
Enheter
Level 24 V dc SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-artikelnummer 358-6901
Tillv. art.nrIK9271.11 AC220-240V 0.1-15A Tv=0.1-20S
VarumärkeDold
1 713,37 kr
Each
Enheter
Current 220 → 240 V ac SPDT - 1 - Undercurrent 0.1A 15A - 0.1 → 20 s - - -
RS-artikelnummer 856-8551
Tillv. art.nrDPC01DM69400HZ
VarumärkeCarlo Gavazzi
3 433,19 kr
Each
Enheter
Phase, Voltage 600 → 690 V ac SPDT Overvoltage, Undervoltage 3, 3+N 510 → 793 V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6 s - - 50 → 400 Hz
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