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庫存編號 850-5376
製造零件編號LXPRC-4W 230V (400V)
TWD3,480.00
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure 0.2 → 10s - - -
RS庫存編號 240-8945
製造零件編號BA9043/001 3AC50-400Hz 400V
BrandDold
TWD8,743.00
單位
Voltage - DPDT Undervoltage 3 - - - - - - - - -
RS庫存編號 775-7936
製造零件編號1SVR730824R9300 CM-PFS.S
BrandABB
TWD5,326.00
單位
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS庫存編號 240-9033
製造零件編號AI897 AC45-400Hz230V 10-80kOhm
BrandDold
TWD5,701.00
單位
Voltage - SPDT - 1, 3 0.8 → 1.1 - - - - <4.2s - - -
RS庫存編號 240-9320
製造零件編號BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
TWD6,349.00
單位
Current - SPDT - - - - 0.1A 10A - 0.5 → 5s - - -
RS庫存編號 727-1256
製造零件編號PUA01CB23500V
TWD4,889.00
單位
Current, Voltage - SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500V dc Overcurrent - - - <300ms - - -
RS庫存編號 857-7416
製造零件編號PPA01CM44
TWD4,782.00
單位
Phase, Voltage - SPDT - 3 177 → 475V ac - - - Phase Loss, Phase Sequence - - - -
RS庫存編號 850-5373
製造零件編號LXPRC 400V
TWD3,453.00
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure 0.2 → 10s - - -
RS庫存編號 262-003
製造零件編號84873026
BrandCrouzet
TWD6,344.00
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS庫存編號 876-5027
製造零件編號1SVR740712R1400 CM-MSS.31P
BrandABB
TWD5,904.00
單位
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS庫存編號 850-5364
製造零件編號LXPRC/S-4W 230V (400V)
TWD2,850.00
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS庫存編號 850-5395
製造零件編號LXCVR 230V
TWD2,408.00
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Single Phase 0.2 → 10s - - -
RS庫存編號 442-9411
製造零件編號1SVR550824R9100
BrandABB
TWD2,115.00
單位
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS庫存編號 240-8939
製造零件編號BA9043 3AC50-400Hz 230/400V
BrandDold
TWD9,022.00
單位
Voltage - DPDT Undervoltage - - - - - - - - - -
RS庫存編號 857-7680
製造零件編號DPA01CM44
TWD5,219.00
單位
Phase, Voltage - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS庫存編號 876-5099
製造零件編號716401
TWD1,821.00
單位
- - - - - - Overcurrent 1A 10A - - - - -
RS庫存編號 146-250
製造零件編號RM17TG00
TWD3,332.00
單位
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS庫存編號 876-5033
製造零件編號1SVR730712R2200 CM-MSS.33S
BrandABB
TWD3,432.00
單位
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS庫存編號 819-3267
製造零件編號K8AKPM2380480VAC
BrandOmron
TWD4,904.00
單位
Phase - SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30s - - -
RS庫存編號 850-5360
製造零件編號LXPRC/S 400V
TWD2,904.00
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -