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. 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. 124-0193
FabrikantnummerRM35LM33MW
€ 62,80
Each
Aantal stuks
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
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. 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. 146-519
FabrikantnummerRM17UBE15
€ 127,39
Each
Aantal stuks
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS-stocknr. 609-8069
FabrikantnummerLT3SE00BD
€ 100,23
Each
Aantal stuks
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 145-976
FabrikantnummerRM35JA32MW
€ 120,40
Each
Aantal stuks
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS-stocknr. 146-468
FabrikantnummerRM35UB3N30
€ 157,61
Each
Aantal stuks
Voltage 120 → 277 V ac DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 114 → 329 V ac - - - - 0.3 → 30 s - - -
RS-stocknr. 146-474
FabrikantnummerRM35UB330
€ 145,94
Each
Aantal stuks
Voltage 220 → 480 V ac DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528 V ac - - - - 0.3 → 30 s - - -
RS-stocknr. 124-0179
FabrikantnummerRM22JA31MR
€ 215,00
Each
Aantal stuks
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 4mA 1A - 0.1 → 30 s - - -
RS-stocknr. 146-171
FabrikantnummerRM17UAS15
€ 106,13
Each
Aantal stuks
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS-stocknr. 124-0191
FabrikantnummerRM35JA32MR
€ 107,50
Each
Aantal stuks
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30 s - - -
RS-stocknr. 146-591
FabrikantnummerRM17TA00
€ 151,20
Each
Aantal stuks
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 146-143
FabrikantnummerRM35UA12MW
€ 149,69
Each
Aantal stuks
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 1 → 100 V - - - - 0.3 → 30 s - - -
RS-stocknr. 124-0188
FabrikantnummerRM22UA33MR
€ 107,50
Each
Aantal stuks
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 15 → 500 V ac/dc - - - - 0.1 → 30 s - - -
RS-stocknr. 146-086
FabrikantnummerRM35BA10
€ 169,30
Each
Aantal stuks
Current, Phase 208 → 480 V ac, 230 V ac SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 146-452
FabrikantnummerRM17UB310
€ 138,90
Each
Aantal stuks
Voltage 208 → 480 V ac SPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 183 → 528 V ac - - - - 0.3 → 30 s - - -
RS-stocknr. 146-250
FabrikantnummerRM17TG00
€ 97,50
Each
Aantal stuks
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS-stocknr. 124-0181
FabrikantnummerRM22LA32MT
€ 109,00
Each
Aantal stuks
Level 323 → 456.5 V ac DPDT - 3 - - - - - 0.1 → 30 s - - -