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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Nombre de résultats par page
Description Prix 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
N° de stock RS 124-0193
Référence fabricantRM35LM33MW
56,52 €
Each
Unité
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
N° de stock RS 146-480
Référence fabricantRM35TF30
130,86 €
Each
Unité
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
N° de stock RS 146-452
Référence fabricantRM17UB310
125,01 €
Each
Unité
Voltage - SPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 183 → 528V ac - - - - 0.3 → 30s - - -
N° de stock RS 146-238
Référence fabricantRM17TG20
63,27 €
Each
Unité
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
N° de stock RS 776-3648
Référence fabricantA9E16065
148,16 €
Each
Unité
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
N° de stock RS 146-092
Référence fabricantRM17JC00MW
115,29 €
Each
Unité
Current - SPDT - - - Overcurrent 2A 20A - 0.5s - - -
N° de stock RS 146-468
Référence fabricantRM35UB3N30
162,27 €
Each
Unité
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 114 → 329V ac - - - - 0.3 → 30s - - -
N° de stock RS 124-0182
Référence fabricantRM22LG11MR
41,79 €
Each
Unité
Level - SPDT - 1 - - - - - - - - -
N° de stock RS 609-8075
Référence fabricantLT3SM00ED
235,29 €
Each
Unité
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
N° de stock RS 609-8069
Référence fabricantLT3SE00BD
103,83 €
Each
Unité
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
N° de stock RS 146-159
Référence fabricantRM17UAS16
88,65 €
Each
Unité
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
N° de stock RS 145-976
Référence fabricantRM35JA32MW
108,36 €
Each
Unité
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
N° de stock RS 146-474
Référence fabricantRM35UB330
149,90 €
Each
Unité
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528V ac - - - - 0.3 → 30s - - -
N° de stock RS 146-597
Référence fabricantRM17TU00
70,25 €
Each
Unité
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
N° de stock RS 776-3650
Référence fabricantA9E16068
152,49 €
Each
Unité
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
N° de stock RS 776-3666
Référence fabricantA9E21182
219,47 €
Each
Unité
Voltage - SPDT Overvoltage, Undervoltage - 10 → 100 V ac/dc, 50 → 500V ac/dc - - - - 0.1 → 10s - - -
N° de stock RS 146-109
Référence fabricantRM35UA11MW
154,10 €
Each
Unité
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
N° de stock RS 146-591
Référence fabricantRM17TA00
136,08 €
Each
Unité
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
N° de stock RS 124-0185
Référence fabricantRM22TU21
51,39 €
Each
Unité
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
N° de stock RS 146-200
Référence fabricantRM35JA31MW
141,71 €
Each
Unité
Current - DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30s - - -