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. 131-791
FabrikantnummerZ-TN230/SS
FabrikantEaton
52,85 €
Each
Aantal stuks
- 230 V ac DPST - - - - - - - - - - 50 Hz
RS-stocknr. 298-9416
Fabrikantnummer45175 230VAC
FabrikantBroyce Control
65,59 €
Each
Aantal stuks
Speed 230 V ac SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30 s - - -
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. 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. 518-7174
Fabrikantnummer3UG4615-1CR20
FabrikantSiemens
187,00 €
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. 518-7297
Fabrikantnummer3UG4513-1BR20
FabrikantSiemens
129,00 €
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. 857-7075
FabrikantnummerDIA53S72420A
FabrikantCarlo Gavazzi
51,10 €
Each
Aantal stuks
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
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. 850-5411
FabrikantnummerLBVR/A 12-24VDC
FabrikantBroyce Control
54,29 €
Each
Aantal stuks
Voltage 8 → 30 V dc SPDT Undervoltage - 12 → 24 V dc - - - - 0 → 30 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. 819-3254
FabrikantnummerK8AKPH1200500VAC
FabrikantOmron
56,90 €
Each
Aantal stuks
Phase 200 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1 s - - -
RS-stocknr. 758-6930
Fabrikantnummer3UG4622-2AW30
FabrikantSiemens
171,00 €
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - - - Overcurrent, Undercurrent 50mA 15A - 0.1 → 20 s - - -
RS-stocknr. 727-1256
FabrikantnummerPUA01CB23500V
FabrikantCarlo Gavazzi
66,10 €
Each
Aantal stuks
Current, Voltage 115/230 V ac SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500 V dc Overcurrent - - - <300 ms - - -
RS-stocknr. 463-3654
Fabrikantnummer84871034
FabrikantCrouzet
133,35 €
Each
Aantal stuks
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1mA 10A - 0.1 → 3 s - - -
RS-stocknr. 518-7168
Fabrikantnummer3UG4622-1AW30
FabrikantSiemens
147,00 €
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS-stocknr. 614-9347
Fabrikantnummer84870700
FabrikantCrouzet
85,82 €
Each
Aantal stuks
Level Control 24 → 240 V ac/dc DPDT - - 24 → 240 V ac - 10mA 5A - 0.1 → 5 s - - 50 → 60 Hz
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. 347-696
FabrikantnummerFSRST30SLP-110/230VAC
FabrikantTempatron
84,60 €
Each
Aantal stuks
Shaft Rotation Sensor 110 V ac, 230 V ac SPDT - - Maximum of 30 V dc - - - - 1 → 30 s - - 50 → 60 Hz
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