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
€ 63,27
Each
Aantal stuks
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS-stocknr. 146-200
FabrikantnummerRM35JA31MW
€ 141,71
Each
Aantal stuks
Current - DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30s - - -
RS-stocknr. 124-0193
FabrikantnummerRM35LM33MW
€ 56,52
Each
Aantal stuks
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS-stocknr. 146-480
FabrikantnummerRM35TF30
€ 130,86
Each
Aantal stuks
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS-stocknr. 124-0184
FabrikantnummerRM22TR33
€ 82,77
Each
Aantal stuks
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 380 → 480V ac - - - Phase Failure, Phase Sequence 0.1 → 30s - - 50 → 60Hz
RS-stocknr. 146-519
FabrikantnummerRM17UBE15
€ 130,84
Each
Aantal stuks
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS-stocknr. 609-8069
FabrikantnummerLT3SE00BD
€ 103,83
Each
Aantal stuks
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 145-976
FabrikantnummerRM35JA32MW
€ 108,36
Each
Aantal stuks
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS-stocknr. 146-474
FabrikantnummerRM35UB330
€ 149,90
Each
Aantal stuks
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528V ac - - - - 0.3 → 30s - - -
RS-stocknr. 146-468
FabrikantnummerRM35UB3N30
€ 162,27
Each
Aantal stuks
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 114 → 329V ac - - - - 0.3 → 30s - - -
RS-stocknr. 124-0179
FabrikantnummerRM22JA31MR
€ 193,50
Each
Aantal stuks
Current - DPDT - 1 - Overcurrent, Undercurrent 4mA 1A - 0.1 → 30s - - -
RS-stocknr. 146-171
FabrikantnummerRM17UAS15
€ 109,01
Each
Aantal stuks
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS-stocknr. 146-250
FabrikantnummerRM17TG00
€ 87,75
Each
Aantal stuks
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS-stocknr. 124-0188
FabrikantnummerRM22UA33MR
€ 97,43
Each
Aantal stuks
Voltage - DPDT Overvoltage, Undervoltage 1 15 → 500V ac/dc - - - - 0.1 → 30s - - -
RS-stocknr. 146-591
FabrikantnummerRM17TA00
€ 136,08
Each
Aantal stuks
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS-stocknr. 146-086
FabrikantnummerRM35BA10
€ 152,37
Each
Aantal stuks
Current, Phase - SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10s - - -
RS-stocknr. 124-0191
FabrikantnummerRM35JA32MR
€ 99,19
Each
Aantal stuks
Current - DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30s - - -
RS-stocknr. 146-452
FabrikantnummerRM17UB310
€ 125,01
Each
Aantal stuks
Voltage - SPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 183 → 528V ac - - - - 0.3 → 30s - - -
RS-stocknr. 146-143
FabrikantnummerRM35UA12MW
€ 153,73
Each
Aantal stuks
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
RS-stocknr. 124-0180
FabrikantnummerRM22LA32MR
€ 71,07
Each
Aantal stuks
Level - DPDT - 1 - - - - - 0.1 → 30s - - -