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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Description Price 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 Stock No. 102-6130
BrandRS PRO
kr 458,19
Each
Units
Voltage 12 → 24 V dc SPDT Undervoltage 1 12 → 24 V dc - - - - 0 → 30 s - - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
kr 541,19
Each
Units
Voltage 8 → 30 V dc SPDT Undervoltage - 12 → 24 V dc - - - - 0 → 30 s - - -
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
kr 1 096,70
Each
Units
Phase 160 → 690 V ac SPDT - - 160 → 690 V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100
BrandABB
kr 2 359,90
Each
Units
Insulation 24 → 240 V ac/dc SPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 776-3663
Mfr. Part No.A9E16070
kr 2 497,98
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
kr 509,45
Each
Units
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
RS Stock No. 124-0187
Mfr. Part No.RM22UA32MR
kr 1 114,17
Each
Units
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 1 → 100 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 758-6942
Mfr. Part No.3UG4632-1AW30
BrandSiemens
kr 1 655,02
Each
Units
Voltage 24 → 240 V ac/dc SPDT Overvoltage, Undervoltage - 10 → 600 V ac/dc - - - - 0.1 → 20 s - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
kr 1 655,02
Each
Units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS Stock No. 890-3884
Mfr. Part No.2902065
kr 1 118,27
Each
Units
Current, Voltage 9.6 → 30 V dc - - - 1.25 → 10 V dc Overcurrent 2.5mA 20mA - - - - -
RS Stock No. 445-9052
Mfr. Part No.IL5881.12/100 DC12-280V 5-200kOHM
BrandDold
kr 2 138,95
Each
Units
Voltage 12 → 280 V dc DPDT - - - - - - - 0.5 → 20 s - - -
RS Stock No. 859-3083
Mfr. Part No.DPA01CM69
kr 1 961,89
Each
Units
Phase, Voltage 600 → 690 V ac SPDT - 3 510 → 760 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 776-1581
Mfr. Part No.72.01.8.240.0000
BrandFinder
kr 507,67
Each
Units
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
kr 1 306,69
Each
Units
Phase, Voltage 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 347-696
Mfr. Part No.FSRST30SLP-110/230VAC
BrandTempatron
kr 843,40
Each
Units
Shaft Rotation Sensor 110 V ac, 230 V ac SPDT - - Maximum of 30 V dc - - - - 1 → 30 s - - 50 → 60 Hz
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
kr 2 113,64
Each
Units
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 850-5409
Mfr. Part No.LMCVR-20V 24-230VAC/DC
kr 952,78
Each
Units
Voltage 24 → 230 V ac/dc SPDT Overvoltage, Undervoltage - 0.1 → 1 V, 0.2 → 2 V, 0.5 → 5 V, 1 → 10 V, 2 → 20 V - - - - 0.1 → 30 s - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
kr 866,28
Each
Units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 776-3648
Mfr. Part No.A9E16065
kr 1 952,32
Each
Units
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS Stock No. 857-7703
Mfr. Part No.DIB01CM24100A
kr 2 751,74
Each
Units
Current 24 V dc, 24 → 240 V ac SPDT - 1 - Overcurrent - - - 1 s, 6 s - - -
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