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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Omschrijving Prijs 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-stocknr. 240-8939
FabrikantnummerBA9043 3AC50-400Hz 230/400V
FabrikantDold
€ 214,14
Each
Aantal stuks
Voltage 230/400 V ac DPDT Undervoltage - - - - - - - - - -
RS-stocknr. 392-7289
Fabrikantnummer3RN1010-1CM00
FabrikantSiemens
€ 72,40
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 146-238
FabrikantnummerRM17TG20
€ 70,30
Each
Aantal stuks
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS-stocknr. 146-200
FabrikantnummerRM35JA31MW
€ 137,99
Each
Aantal stuks
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30 s - - -
RS-stocknr. 857-7696
FabrikantnummerDPB01CM48
FabrikantCarlo Gavazzi
€ 233,91
Each
Aantal stuks
Phase, Voltage 380 → 480 V ac SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550 V ac - - - Phase Loss, Phase Sequence 1 s, 6 s - - -
RS-stocknr. 857-7416
FabrikantnummerPPA01CM44
FabrikantCarlo Gavazzi
€ 109,66
Each
Aantal stuks
Phase, Voltage 208 → 480 V ac SPDT - 3 177 → 475 V ac - - - Phase Loss, Phase Sequence - - - -
RS-stocknr. 327-7679
FabrikantnummerIK9179.11 3AC50/60Hz 400V
FabrikantDold
€ 72,92
Each
Aantal stuks
Phase 400 V ac SPDT - 3 - - - - Phase Sequence - - - -
RS-stocknr. 775-7983
Fabrikantnummer1SVR730840R0500
FabrikantABB
€ 218,00
Each
Aantal stuks
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS-stocknr. 124-0193
FabrikantnummerRM35LM33MW
€ 62,80
Each
Aantal stuks
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS-stocknr. 445-9052
FabrikantnummerIL5881.12/100 DC12-280V 5-200kOHM
FabrikantDold
€ 214,56
Each
Aantal stuks
Voltage 12 → 280 V dc DPDT - - - - - - - 0.5 → 20 s - - -
RS-stocknr. 727-1256
FabrikantnummerPUA01CB23500V
FabrikantCarlo Gavazzi
€ 66,10
Each
Aantal stuks
Current, Voltage 115/230 V ac SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500 V dc Overcurrent - - - <300 ms - - -
RS-stocknr. 146-480
FabrikantnummerRM35TF30
€ 145,40
Each
Aantal stuks
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 775-7902
Fabrikantnummer1SVR730884R3300
FabrikantABB
€ 208,00
Each
Aantal stuks
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS-stocknr. 776-1581
Fabrikantnummer72.01.8.240.0000
FabrikantFinder
€ 56,30
Each
Aantal stuks
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 837-7490
Fabrikantnummer84873029
FabrikantCrouzet
€ 74,85
Each
Aantal stuks
Phase, Voltage 3 x 208 → 3 x 480 V ac SPDT Overvoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence ≤650 ms - - -
RS-stocknr. 857-7075
FabrikantnummerDIA53S72420A
FabrikantCarlo Gavazzi
€ 49,53
Each
Aantal stuks
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
RS-stocknr. 124-0184
FabrikantnummerRM22TR33
€ 91,40
Each
Aantal stuks
Phase, Voltage 304 → 576 V ac DPDT Overvoltage, Undervoltage 3 380 → 480 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s - - -
RS-stocknr. 358-6901
FabrikantnummerIK9271.11 AC220-240V 0.1-15A Tv=0.1-20S
FabrikantDold
€ 165,70
Each
Aantal stuks
Current 220 → 240 V ac SPDT - 1 - Undercurrent 0.1A 15A - 0.1 → 20 s - - -
RS-stocknr. 857-7662
FabrikantnummerDPA51CM44
FabrikantCarlo Gavazzi
€ 158,50
Each
Aantal stuks
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS-stocknr. 819-3305
FabrikantnummerK8AK-VW3 100-240VAC
FabrikantOmron
€ 96,85
Each
Aantal stuks
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V ac/dc, 30 → 300 V ac/dc, 60 → 600 V ac/dc - - - - 0.1 → 30 s - - -
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