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. 102-6130
FabrikantRS PRO
45,96 €
Each
Aantal stuks
Voltage 12 → 24 V dc SPDT Undervoltage 1 12 → 24 V dc - - - - 0 → 30 s - - -
RS-stocknr. 102-6134
FabrikantRS PRO
90,78 €
Each
Aantal stuks
Current 24 → 230 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30 s - - 48 → 63 Hz
RS-stocknr. 102-6133
FabrikantRS PRO
90,78 €
Each
Aantal stuks
Voltage 24 → 230 V ac/dc SPDT Overvoltage, Undervoltage 1 50 → 500 V - - - - 0.1 → 30 s - - 48 → 63 Hz
RS-stocknr. 102-6137
FabrikantRS PRO
66,59 €
Each
Aantal stuks
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage 3 300 → 380 (Undervoltage) V, 420 → 500 (Overvoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS-stocknr. 102-6136
FabrikantRS PRO
51,75 €
Each
Aantal stuks
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 300 → 500 (Undervoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS-stocknr. 102-6135
FabrikantRS PRO
49,21 €
Each
Aantal stuks
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100 ms - - 48 → 63 Hz
RS-stocknr. 102-6131
FabrikantRS PRO
51,75 €
Each
Aantal stuks
Voltage 230 V ac SPDT Overvoltage, Undervoltage 1 173 → 218 (Undervoltage) V, 242 → 288 (Overvoltage) V - - - - 0.2 → 10 s - - 48 → 63 Hz
RS-stocknr. 131-791
Fabrikantnummer265574 | Z-TN230/SS
FabrikantEaton
52,71 €
Each
Aantal stuks
- 230 V ac DPST - - - - - - - - - - 50 Hz
RS-stocknr. 298-9416
Fabrikantnummer45175 230VAC
FabrikantBroyce Control
72,09 €
Each
Aantal stuks
Speed 230 V ac SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30 s - - -
RS-stocknr. 124-0193
FabrikantnummerRM35LM33MW
56,52 €
Each
Aantal stuks
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS-stocknr. 240-9320
FabrikantnummerBA9053/410 AC1A/5A/10A AC230V 0-20S
FabrikantDold
221,80 €
Each
Aantal stuks
Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS-stocknr. 240-8939
FabrikantnummerBA9043 3AC50-400Hz 230/400V
FabrikantDold
214,14 €
Each
Aantal stuks
Voltage 230/400 V ac DPDT Undervoltage - - - - - - - - - -
RS-stocknr. 850-5411
FabrikantnummerLBVR/A 12-24VDC
FabrikantBroyce Control
59,48 €
Each
Aantal stuks
Voltage 8 → 30 V dc SPDT Undervoltage - 12 → 24 V dc - - - - 0 → 30 s - - -
RS-stocknr. 518-7297
Fabrikantnummer3UG4513-1BR20
FabrikantSiemens
131,40 €
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 857-7905
FabrikantnummerDUB01CD48500V
FabrikantCarlo Gavazzi
172,06 €
Each
Aantal stuks
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 2 → 500 V ac/dc - - - - 1 s, 6 s - - -
RS-stocknr. 146-480
FabrikantnummerRM35TF30
130,86 €
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. 857-7075
FabrikantnummerDIA53S72420A
FabrikantCarlo Gavazzi
51,10 €
Each
Aantal stuks
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
RS-stocknr. 518-7174
Fabrikantnummer3UG4615-1CR20
FabrikantSiemens
190,80 €
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 857-7662
FabrikantnummerDPA51CM44
FabrikantCarlo Gavazzi
158,50 €
Each
Aantal stuks
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS-stocknr. 758-6930
Fabrikantnummer3UG4622-2AW30
FabrikantSiemens
158,40 €
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - - - Overcurrent, Undercurrent 50mA 15A - 0.1 → 20 s - - -
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