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. 850-5376
Mfr. Part No.LXPRC-4W 230V (400V)
TWD2,432.00
Each
units
Phase, Voltage 230 V ac SPDT Overvoltage, Undervoltage - 173 → 218 (Under) V, 242 → 288 (Over) V - - - Phase Failure 0.2 → 10 s - - -
RS Stock No. 240-8945
Mfr. Part No.BA9043/001 3AC50-400Hz 400V
BrandDold
TWD5,324.00
Each
units
Voltage 230/400 V ac DPDT Undervoltage 3 - - - - - - - - -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
TWD3,010.00
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS Stock No. 240-9033
Mfr. Part No.AI897 AC45-400Hz230V 10-80kOhm
BrandDold
TWD5,902.00
Each
units
Voltage 230 V ac SPDT - 1, 3 0.8 → 1.1 - - - - <4.2 s - - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
TWD8,141.00
Each
units
Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
TWD2,363.00
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. 857-7416
Mfr. Part No.PPA01CM44
TWD4,115.00
Each
units
Phase, Voltage 208 → 480 V ac SPDT - 3 177 → 475 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 850-5373
Mfr. Part No.LXPRC 400V
TWD2,781.00
Each
units
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage - 300 → 380 (Under) V, 420 → 500 (Over) V - - - Phase Failure 0.2 → 10 s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
TWD3,916.00
Each
units
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 876-5027
Mfr. Part No.1SVR740712R1400
BrandABB
TWD4,286.00
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 518-7203
Mfr. Part No.3RN1011-1BB00
BrandSiemens
TWD3,469.00
Each
units
Thermistor motor protection relay 24 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 850-5364
Mfr. Part No.LXPRC/S-4W 230V (400V)
TWD2,390.00
Each
units
Phase, Voltage 230 V ac SPDT Overvoltage, Undervoltage - 173 → 218 (Under) V, 242 → 288 (Over) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
RS Stock No. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
TWD1,798.00
Each
units
Phase 208 → 440 V ac SPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
TWD5,324.00
Each
units
Voltage 230/400 V ac DPDT Undervoltage - - - - - - - - - -
RS Stock No. 102-6139
Mfr. Part No.106943
BrandEaton
TWD8,736.00
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 (B1) A, 1 (B2) A, 3 (B3) A 1.5 (B1) A, 5 (B2) A, 15 (B3) A - 0.1 → 30 s - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
TWD4,071.00
Each
units
Phase, Voltage 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 850-5395
Mfr. Part No.LXCVR 230V
TWD1,890.00
Each
units
Phase, Voltage 230 V ac SPDT Overvoltage, Undervoltage - 173 → 218 (Under) V, 242 → 288 (Over) V - - - Single Phase 0.2 → 10 s - - -
RS Stock No. 819-3267
Mfr. Part No.K8AKPM2380480VAC
BrandOmron
TWD4,228.00
Each
units
Phase 220 → 480 V ac SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30 s - - -
RS Stock No. 876-5099
Mfr. Part No.716401
TWD1,567.00
Each
units
- 10 → 32 V dc - - - - Overcurrent 1A 10A - - - - -
RS Stock No. 850-5370
Mfr. Part No.LXPRT 280-520VAC
TWD2,346.00
Each
units
Phase, Voltage 280 → 520 V ac SPDT Undervoltage - 300 → 500 V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -