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. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
$190.53
Each
units
Speed 24 V dc SPDT - - - - - - - 0.1 → 20 s - - -
RS Stock No. 291-3144
Mfr. Part No.IL9077.12 3/NAC 400/230V 0.1-20S
BrandDold
$281.79
Each
units
Voltage 230/400 V ac DPDT Overvoltage, Undervoltage 3 - - - - - 0.1 → 20 s - - -
RS Stock No. 240-8844
Mfr. Part No.BD5936.17 AC50/60Hz 230V
BrandDold
$580.44
Each
units
Standstill 230 V ac DPDT - - - - - - - - - - -
RS Stock No. 445-9052
Mfr. Part No.IL5881.12/100 DC12-280V 5-200kOHM
BrandDold
$431.52
Each
units
Voltage 12 → 280 V dc DPDT - - - - - - - 0.5 → 20 s - - -
RS Stock No. 358-7049
Mfr. Part No.IK9169.11 3AC380-415/220-240V
BrandDold
$165.80
Each
units
Phase 220 → 240 V ac, 380 → 415 V ac SPDT - 3 - - - - Phase Failure - - - -
RS Stock No. 410-5963
Mfr. Part No.IK9094.11 AC/DC24V 0-150°C
BrandDold
$148.43
Each
units
Temperature 24 V ac/dc SPDT - - - - - - - - Overtemperature 0 → +150°C -
RS Stock No. 291-3150
Mfr. Part No.IL9079.12/002 3AC230/400V 0.55-1.05UN 0.2-2S
BrandDold
$466.20
Each
units
Voltage 230/400 V ac DPDT Undervoltage 3 - - - - - 0.2 → 2 s - - -
RS Stock No. 465-0659
Mfr. Part No.MK9053N.12/010 AC0.5-5A
BrandDold
$373.03
Each
units
Current 230 V ac DPDT - - - Overcurrent 0.5A 5A - 0 → 20 s - - -
RS Stock No. 327-7641
Mfr. Part No.IL9151.12 2-450kOHM AC230V 0.2-20S
BrandDold
$250.83
Each
units
- - - - - - - - - - - - - -
RS Stock No. 240-9027
Mfr. Part No.IL9075.12/001 AC50-400Hz 400V
BrandDold
$249.80
Each
units
Phase 400 → 440 V ac DPDT - 3 - - - - - <50 ms - - -
RS Stock No. 181-2803
Mfr. Part No.MK7830N.82 AC/DC24V+AC230V 0,02s-9999h
BrandDold
$285.66
Each
units
Multifunction 24 V ac/dc, 230 V ac DPDT - - 250 V - - - - 0.02 s → 9999 h - - -
RS Stock No. 181-2793
Mfr. Part No.MK9143N.38 +/-5Hz UH=DC24V tv=0-20s tan=0-30s
BrandDold
$367.60
Each
units
Frequency 24 V dc 2 x 1CO - - - - - - - 0 → 20 s, 0 → 30 s - - ±5 Hz
RS Stock No. 465-0665
Mfr. Part No.MK9053N.12/012 AC0.5-5A
BrandDold
$373.03
Each
units
Current 230 V ac DPDT - - - Undercurrent 0.5A 5A - 0 → 20 s - - -
RS Stock No. 181-2789
Mfr. Part No.MK9055N.38/500
BrandDold
$367.60
Each
units
Speed - - - - - - - - - - - - -
RS Stock No. 240-9049
Mfr. Part No.AI898 DC24V 6kOhm UH=AC45-400Hz 230V
BrandDold
$674.93
Each
units
Voltage 24 V dc SPDT - - 0.8 → 1.1 - - - - 0.4 s - - -
RS Stock No. 181-2794
Mfr. Part No.RK9871.72 3/N AC400/230V 50/60Hz
BrandDold
$198.66
Each
units
Voltage 400/230 V ac DPDT - 3 - - - - - 0.5 (Fault Indication) s, 1 (Reset) min - - 45 → 65 Hz
RS Stock No. 240-9320
Mfr. Part No.BA9053/410 AC1A/5A/10A AC230V 0-20S
BrandDold
$363.40
Each
units
Current 230 V ac SPDT - - - - 0.1A 10A - 0.5 → 5 s - - -
RS Stock No. 465-0687
Mfr. Part No.IK8702.01 AC50/60Hz 230V
BrandDold
$85.80
Each
units
Current 230 V ac SPST - - - - - - - >=30 ms - - -
RS Stock No. 240-8951
Mfr. Part No.IL9071.12 3/N AC400/230V 0.85UN 4%
BrandDold
$396.21
Each
units
Voltage 230/400 V ac DPDT Undervoltage 3 - - - - - - - - -
RS Stock No. 445-9068
Mfr. Part No.IL5880.12 AC50-400Hz 220-240V 5-100kOHM
BrandDold
$251.06
Each
units
Voltage 220 → 240 V ac DPDT - 1, 3 0 → 500 V ac - - - - <1.3 s - - -