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. 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. 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. 146-238
FabrikantnummerRM17TG20
70,30 €
Each
Aantal stuks
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS-stocknr. 776-3648
FabrikantnummerA9E16065
143,00 €
Each
Aantal stuks
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
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. 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. 124-0182
FabrikantnummerRM22LG11MR
45,95 €
Each
Aantal stuks
Level 20.4 → 264 V ac/dc SPDT - 1 - - - - - <0.6 (Run-Up) s - - -
RS-stocknr. 609-8069
FabrikantnummerLT3SE00BD
100,23 €
Each
Aantal stuks
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 146-159
FabrikantnummerRM17UAS16
98,50 €
Each
Aantal stuks
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS-stocknr. 146-092
FabrikantnummerRM17JC00MW
128,10 €
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - - - Overcurrent 2A 20A - 0.5 s - - -
RS-stocknr. 609-8075
FabrikantnummerLT3SM00ED
227,11 €
Each
Aantal stuks
Temperature 24 → 48 V dc SPDT - - - - - - - - Overtemperature, Undertemperature - -
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. 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. 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. 776-3666
FabrikantnummerA9E21182
211,37 €
Each
Aantal stuks
Voltage 230 V ac SPDT Overvoltage, Undervoltage - 10 → 100 V ac/dc, 50 → 500 V ac/dc - - - - 0.1 → 10 s - - -
RS-stocknr. 776-3663
FabrikantnummerA9E16070
274,30 €
Each
Aantal stuks
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS-stocknr. 146-597
FabrikantnummerRM17TU00
78,05 €
Each
Aantal stuks
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 124-0185
FabrikantnummerRM22TU21
57,10 €
Each
Aantal stuks
Phase, Voltage 160 → 288 V ac DPDT Undervoltage 3 200 → 240 V ac - - - Phase Failure, Phase Sequence ≤650 (Run-Up) ms - - -
RS-stocknr. 609-8081
FabrikantnummerLT3SM00MW
243,90 €
Each
Aantal stuks
Temperature 24 → 230 V ac DPDT - - - - - - - - Overtemperature, Undertemperature - -