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
62,80 €
Each
Unité
Level 20.4 264 V ac/dc DPDT - 1 - - - - - 0.1 5 s - - -
N° de stock RS 146-480
Référence fabricantRM35TF30
145,40 €
Each
Unité
Phase, Voltage 220 480 V ac DPDT Overvoltage, Undervoltage 3 194 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 10 s - - -
N° de stock RS 146-452
Référence fabricantRM17UB310
138,90 €
Each
Unité
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 - - -
N° de stock RS 146-238
Référence fabricantRM17TG20
70,30 €
Each
Unité
Phase 208 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
N° de stock RS 776-3648
Référence fabricantA9E16065
143,00 €
Each
Unité
Time Delay 24 240 V ac, 24 V dc SPDT - - 24 240 V ac - - - - - - - -
N° de stock RS 146-468
Référence fabricantRM35UB3N30
157,61 €
Each
Unité
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 - - -
N° de stock RS 609-8075
Référence fabricantLT3SM00ED
227,11 €
Each
Unité
Temperature 24 48 V dc SPDT - - - - - - - - Overtemperature, Undertemperature - -
N° de stock RS 146-092
Référence fabricantRM17JC00MW
128,10 €
Each
Unité
Current 24 240 V ac/dc SPDT - - - Overcurrent 2A 20A - 0.5 s - - -
N° de stock RS 124-0182
Référence fabricantRM22LG11MR
45,95 €
Each
Unité
Level 20.4 → 264 V ac/dc SPDT - 1 - - - - - <0.6 (Run-Up) s - - -
N° de stock RS 609-8069
Référence fabricantLT3SE00BD
100,23 €
Each
Unité
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
N° de stock RS 146-159
Référence fabricantRM17UAS16
98,50 €
Each
Unité
Voltage 24 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 80 V ac/dc - - - - 0.1 10 s - - -
N° de stock RS 145-976
Référence fabricantRM35JA32MW
120,40 €
Each
Unité
Current 24 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 30 s - - -
N° de stock RS 146-597
Référence fabricantRM17TU00
78,05 €
Each
Unité
Phase, Voltage 208 480 V ac SPDT Undervoltage 3 183 528 V ac - - - Phase Failure, Phase Sequence 0.1 10 s - - -
N° de stock RS 146-193
Référence fabricantRM35HZ21FM
153,91 €
Each
Unité
Frequency 120 277 V ac DPDT - - - - - - - 0.1 10 s - - 40 70 Hz
N° de stock RS 146-200
Référence fabricantRM35JA31MW
137,99 €
Each
Unité
Current 24 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 30 s - - -
N° de stock RS 146-109
Référence fabricantRM35UA11MW
149,69 €
Each
Unité
Voltage 24 240 V ac/dc DPDT Overvoltage, Undervoltage - 0.05 5 V - - - - 0.3 30 s - - -
N° de stock RS 146-474
Référence fabricantRM35UB330
145,94 €
Each
Unité
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 - - -
N° de stock RS 776-3663
Référence fabricantA9E16070
274,30 €
Each
Unité
Time Delay 24 240 V ac, 24 V dc SPDT - - 24 240 V ac - - - - - - - -
N° de stock RS 124-0185
Référence fabricantRM22TU21
57,10 €
Each
Unité
Phase, Voltage 160 288 V ac DPDT Undervoltage 3 200 240 V ac - - - Phase Failure, Phase Sequence ≤650 (Run-Up) ms - - -
N° de stock RS 146-020
Référence fabricantRM35LV14MW
116,76 €
Each
Unité
Level 24 240 V ac/dc SPDT - - - - - - - 0.1 5 s - - -