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. 876-5109
Mfr. Part No.716408
kr 589,38
Each
Units
- 10 → 32 V dc - - - - Overcurrent 1A 5A - - - - -
RS Stock No. 609-8069
Mfr. Part No.LT3SE00BD
kr 1 710,72
Each
Units
Temperature 24 V dc SPST - - - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 850-5360
Mfr. Part No.LXPRC/S 400V
kr 772,87
Each
Units
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage - 300 → 380 (Under) V, 420 → 500 (Over) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
RS Stock No. 819-3273
Mfr. Part No.K8AK-TH11S 100-240VAC
BrandOmron
kr 886,50
Each
Units
Temperature 100 → 240 V ac SPDT - - - - - - - 100 ms Overtemperature 0 → 999°C -
RS Stock No. 794-3951
Mfr. Part No.MJ93BK
BrandGIC
kr 554,33
Each
Units
Thermistor 220 → 440 V ac DPDT - 3 - - - 6A - 100 ms, 500 ms - - -
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300
BrandABB
kr 2 539,36
Each
Units
Phase, Voltage 450 → 720 V ac DPDT Overvoltage, Undervoltage 3 450 → 720 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 65 Hz
RS Stock No. 857-7179
Mfr. Part No.DUB01CB23500V
kr 1 785,28
Each
Units
Voltage 115/230 V ac SPDT Overvoltage, Undervoltage 1 2 → 500 V ac/dc - - - - 1 s, 6 s - - -
RS Stock No. 775-8006
Mfr. Part No.1SVR730841R1300
BrandABB
kr 1 525,41
Each
Units
Current 220 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS Stock No. 857-7696
Mfr. Part No.DPB01CM48
kr 2 378,55
Each
Units
Phase, Voltage 380 → 480 V ac SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550 V ac - - - Phase Loss, Phase Sequence 1 s, 6 s - - -
RS Stock No. 857-7690
Mfr. Part No.DPC01DM23
kr 3 277,76
Each
Units
Phase, Voltage 208 → 240 V ac SPDT Overvoltage, Undervoltage 3, 3+N 177 → 275 V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6 s - - 50 → 60 Hz
RS Stock No. 124-0186
Mfr. Part No.RM22UA31MR
kr 2 293,92
Each
Units
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 50 mV ac/dc → 5 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 801-6224
Mfr. Part No.2866035
kr 1 557,31
Each
Units
Voltage 24 V dc, 24 → 230 V ac SPDT Undervoltage 1 0 → 300 V ac/dc - - - - 0.2 → 10 s - - -
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
kr 1 611,72
Each
Units
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
kr 775,07
Each
Units
Level Control 24 → 240 V ac/dc DPDT - - 24 → 240 V ac - 10mA 5A - 0.1 → 5 s - - 50 → 60 Hz
RS Stock No. 321-6804
Mfr. Part No.45080 400/400VAC
kr 897,00
Each
Units
Phase, Voltage 400 V ac SPDT Undervoltage 3 Maximum of 400 V ac - - - Phase Loss, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 801-6220
Mfr. Part No.2866048
kr 2 329,99
Each
Units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage 1 0 → 300 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 890-3875
Mfr. Part No.2902035
kr 1 988,52
Each
Units
Current, Voltage 9.6 → 30 V dc SPDT - - 0 → 12 V Overcurrent 0mA 24mA - - - - -
RS Stock No. 327-7679
Mfr. Part No.IK9179.11 3AC50/60Hz 400V
BrandDold
kr 771,45
Each
Units
Phase 400 V ac SPDT - 3 - - - - Phase Sequence - - - -
RS Stock No. 758-6920
Mfr. Part No.3UG4511-1AN20
BrandSiemens
kr 994,01
Each
Units
Phase 160 → 260 V ac SPDT - - 160 → 260 V ac - - - Phase Sequence - - - -
RS Stock No. 298-9393
Mfr. Part No.45205 230VAC
kr 844,86
Each
Units
Load Sharing 230 V ac DPST - - - - - - - 2 s - - -
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