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. 146-238
Mfr. Part No.RM17TG20
kr 1 010,88
Each
Units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
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. 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. 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. 857-7426
Mfr. Part No.DPC01DM48
kr 3 213,49
Each
Units
Phase, Voltage 380 → 480 V ac SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550 V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6 s - - 50 → 60 Hz
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
kr 1 009,66
Each
Units
Current 24 → 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
RS Stock No. 124-0184
Mfr. Part No.RM22TR33
kr 1 308,96
Each
Units
Phase, Voltage 304 → 576 V ac DPDT Overvoltage, Undervoltage 3 380 → 480 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
kr 1 434,18
Each
Units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1mA 10A - 0.1 → 3 s - - -
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 - - -
RS Stock No. 806-5935
Mfr. Part No.1SVR740660R0100
BrandABB
kr 2 431,68
Each
Units
Insulation 24 → 240 V ac/dc DPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 857-7167
Mfr. Part No.DUA01CB23500V
kr 1 183,91
Each
Units
Current, Voltage 115/230 V ac SPDT Overvoltage 1 0.4 → 4 V ac, 2 → 20 V ac/dc, 20 → 200 V ac/dc, 5 → 50 V ac/dc, 50 → 500 V ac/dc Overcurrent - - - - - - -
RS Stock No. 917-4850
Mfr. Part No.ECOM0010
BrandCelduc
kr 1 444,65
Each
Units
Current 24 V dc - - 3 - - 2A 50A - - - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
kr 1 075,68
Each
Units
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 819-3201
Mfr. Part No.K8AK-AS1 100-240VAC
BrandOmron
kr 900,00
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - - - - -
RS Stock No. 819-3208
Mfr. Part No.K8AK-AS2 100-240VAC
BrandOmron
kr 900,00
Each
Units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1A 8A - - - - -
RS Stock No. 123-9729
Mfr. Part No.K3UM24VDC02
BrandTele
kr 1 430,60
Each
Units
Voltage 24 V dc DPDT Undervoltage 1 Maximum of 24 V dc - - - - - - - -
RS Stock No. 146-143
Mfr. Part No.RM35UA12MW
kr 1 701,52
Each
Units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 1 → 100 V - - - - 0.3 → 30 s - - -
RS Stock No. 463-3648
Mfr. Part No.84871024
BrandCrouzet
kr 1 387,52
Each
Units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
kr 1 635,08
Each
Units
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
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