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. 857-7416
Mfr. Part No.PPA01CM44
TWD4,740.00
Each
units
Phase, Voltage 208 480 V ac SPDT - 3 177 475 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
TWD2,695.00
Each
units
Current, Voltage 115/230 V ac SPDT Overvoltage - 0.4 500 V ac, 2 500 V dc Overcurrent - - - <300 ms - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
TWD5,666.00
Each
units
Phase, Voltage 208 480 V ac SPDT - 3 177 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
TWD6,852.00
Each
units
Phase 208 480 V ac SPDT - 3 177 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7280
Mfr. Part No.DWB01CM4810A
TWD10,407.00
Each
units
Power Factor 380 480 V ac SPDT - 3 - - - 5 A, 10 A - 1 30 s - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
TWD1,618.00
Each
units
Current - SPST - 1 - Overcurrent - - - <300 ms - - -
RS Stock No. 859-3077
Mfr. Part No.DFB01CM24
TWD11,024.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 857-7185
Mfr. Part No.PIB02CB23150MV
TWD6,555.00
Each
units
Current 115/230 V ac SPDT - 1 0.4 4 V ac, 6 150 mV ac/dc Overcurrent, Undercurrent - - - 1 s, 6 s - - -
RS Stock No. 859-3080
Mfr. Part No.DWA01CM485A
TWD8,334.00
Each
units
Power Factor Cosf 380 480 V ac SPDT - 3 - - - - - 1 s, 2 s, 6 s - - -
RS Stock No. 857-7690
Mfr. Part No.DPC01DM23
TWD13,667.00
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. 857-7527
Mfr. Part No.DIB01CB23500MA
TWD7,444.00
Each
units
Current 115/230 V ac SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6 s - - -
RS Stock No. 857-7426
Mfr. Part No.DPC01DM48
TWD13,667.00
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. 857-7189
Mfr. Part No.DIB02CB23150MV
TWD7,444.00
Each
units
Current 115/230 V ac SPDT - 1 0.4 4 V ac, 6 150 mV ac/dc Overcurrent, Undercurrent - - - 1 s, 6 s - - -
RS Stock No. 165-1484
Mfr. Part No.DPD02DM44
TWD5,472.00
Each
units
Frequency, Phase, Voltage 166 576 V SPDT - 3 102 318 V ac, 177 552 V ac - - - Phase Loss, Phase Presence, Phase Sequence 60 s - - 45 440 Hz
RS Stock No. 859-3083
Mfr. Part No.DPA01CM69
TWD8,149.00
Each
units
Phase, Voltage 600 690 V ac SPDT - 3 510 760 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7182
Mfr. Part No.DIB01CB235A
TWD7,444.00
Each
units
Current 115/230 V ac SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6 s - - -
RS Stock No. 857-7167
Mfr. Part No.DUA01CB23500V
TWD5,037.00
Each
units
Current, Voltage 115/230 V ac SPDT Overvoltage 1 0.4 4 V ac, 2 20 V ac/dc, 5 50 V ac/dc, 20 200 V ac/dc, 50 500 V ac/dc Overcurrent - - - - - - -
RS Stock No. 859-3285
Mfr. Part No.PPB01CM48
TWD8,592.00
Each
units
Phase, Voltage 380 415 V ac SPDT Overvoltage, Undervoltage 3, 3+N 323 475 V ac - - - Phase Loss, Phase Sequence 1 s, 6 s - - -
RS Stock No. 857-7703
Mfr. Part No.DIB01CM24100A
TWD11,703.00
Each
units
Current 24 240 V ac, 24 V dc SPDT - 1 - Overcurrent - - - 1 s, 6 s - - -
RS Stock No. 859-3027
Mfr. Part No.DUA52C724
TWD4,987.00
Each
units
Voltage 12 24 V dc SPDT Undervoltage - 8 28 V dc - - - - <200 ms - - -