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 Voltage Sensing Range Current Sensitivity Minimum Current Sensed Maximum Current Sensed Phase Sensitivity Time Delay Temperature Sensitivity Temperature Sensing Range Frequency Sensing Range Current Range
RS Stock No. 240-8945
Mfr. Part No.BA9043/001 3AC50-400Hz 400V
BrandDold
TWD8,883.00
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
TWD5,645.00
Each
units
Current - SPDT - - - 0.1A 10A - 0.5 → 5s - - - 0.1 → 1 A, 0.5 → 5 A, 1 → 10A
RS Stock No. 240-9033
Mfr. Part No.AI897 AC45-400Hz230V 10-80kOhm
BrandDold
TWD5,069.00
Each
units
Voltage - SPDT - 0.8 → 1.1 - - - - <4.2s - - - -
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
TWD8,883.00
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 240-8995
Mfr. Part No.MK9052.11 AC50/60Hz 230V
BrandDold
TWD2,020.00
Each
units
Thermistor - SPDT - - - - - - <20ms - - - -
RS Stock No. 656-6269
Mfr. Part No.IL9837.11 5-200Hz UH=230V
BrandDold
TWD7,417.00
Each
units
Frequency - SPDT - - - - - - 0.1 → 20s - - 5 → 200Hz -
RS Stock No. 445-9046
Mfr. Part No.IL5882.38 AC/DC24V-230V Tv=5S
BrandDold
TWD10,433.00
Each
units
Current - DPDT - - - 10mA 10A - 0 → 5s - - - 10 mA → 10A
RS Stock No. 240-8951
Mfr. Part No.IL9071.12 3/N AC400/230V 0.85UN 4%
BrandDold
TWD8,570.00
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
TWD6,083.00
Each
units
Speed - SPDT - - - - - - 0.1 → 20s - - - -
RS Stock No. 500-3408
Mfr. Part No.MK9163N.12/100 AC/DC24V
BrandDold
TWD3,220.00
Each
units
Temperature - DPDT - - - - - - - Overtemperature - - -
RS Stock No. 465-0665
Mfr. Part No.MK9053N.12/012 AC0.5-5A
BrandDold
TWD9,206.00
Each
units
Current - DPDT - - Undercurrent 0.5A 5A - 0 → 20s - - - 0.5 → 5A
RS Stock No. 656-6253
Mfr. Part No.IK9143.11 AC50/60Hz 230V Hyst.0.5-10%
BrandDold
TWD4,809.00
Each
units
Frequency - SPDT - - - - - - - - - Maximum of 60Hz -
RS Stock No. 358-7049
Mfr. Part No.IK9169.11 3AC380-415/220-240V
BrandDold
TWD3,044.00
Each
units
Phase - SPDT - - - - - Phase Failure - - - - -
RS Stock No. 445-9068
Mfr. Part No.IL5880.12 AC50-400Hz 220-240V 5-100kOHM
BrandDold
TWD8,081.00
Each
units
Voltage - DPDT - 0 → 500V ac - - - - <1.3s - - - -
RS Stock No. 500-3515
Mfr. Part No.MK9163N.12/110 ATEX AC/DC24V
BrandDold
TWD3,302.00
Each
units
Temperature - DPDT - - - - - - - Overtemperature - - -
RS Stock No. 240-8923
Mfr. Part No.BA9041 3AC50Hz 400V
BrandDold
TWD3,165.00
Each
units
Phase - DPDT - - - - - Phase Sequence <50ms - - - -
RS Stock No. 445-9052
Mfr. Part No.IL5881.12/100 DC12-280V 5-200kOHM
BrandDold
TWD8,900.00
Each
units
Voltage - DPDT - - - - - - 0.5 → 20s - - - -
RS Stock No. 358-6951
Mfr. Part No.IK9178 3AC50/60Hz 400V
BrandDold
TWD2,216.00
Each
units
Phase - - - - - - - Phase Sequence - - - - -
RS Stock No. 465-0671
Mfr. Part No.MK9056N.12 AC50/60Hz 380-500V
BrandDold
TWD3,006.00
Each
units
Phase - DPDT - - - - - Phase Sequence <50ms - - - -
RS Stock No. 291-3150
Mfr. Part No.IL9079.12/002 3AC230/400V 0.55-1.05UN 0.2-2S
BrandDold
TWD9,034.00
Each
units
Voltage - DPDT Undervoltage - - - - - 0.2 → 2s - - - -