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. 794-3954
Mfr. Part No.MI91BL
BrandGIC
$73.26
Each
units
Frequency 220 → 440 V ac SPDT - 3 - - - 6A - 100 ms, 500 ms - - -
RS Stock No. 123-9720
Mfr. Part No.E3LM10 230V AC
BrandTele
$181.95
Each
units
Liquid Level 230 V ac SPDT - 1 - - - - - 0.5 → 10 s - - -
RS Stock No. 819-3210
Mfr. Part No.K8AK-AS3 100-240VAC
BrandOmron
$251.08
Each
units
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 819-3245
Mfr. Part No.K8AK-LS1 100-240VAC
BrandOmron
$234.14
Each
units
Level Control 100 → 240 V ac SPDT - - - - - - - - - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
$330.99
Each
units
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 876-5799
Mfr. Part No.CM-TCS.23P
BrandABB
$400.98
Each
units
Temperature 24 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 → +200°C 45 → 65 Hz
RS Stock No. 463-3452
Mfr. Part No.84872020
BrandCrouzet
$215.97
Each
units
Voltage 24 V dc SPDT - 1 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS Stock No. 240-8844
Mfr. Part No.BD5936.17 AC50/60Hz 230V
BrandDold
$580.45
Each
units
Standstill 230 V ac DPDT - - - - - - - - - - -
RS Stock No. 819-3264
Mfr. Part No.K8AKPW2380480VAC
BrandOmron
$206.29
Each
units
Voltage 220 → 480 V ac SPDT Overvoltage, Undervoltage 3 - - - - - 0.1 → 30 s - - -
RS Stock No. 144-462
Mfr. Part No.15543
$232.64
Each
units
- 24 V ac SPDT - - - - - - - - - - -
RS Stock No. 146-474
Mfr. Part No.RM35UB330
$369.84
Each
units
Voltage 220 → 480 V ac DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 775-7882
Mfr. Part No.1SVR730774R1300
BrandABB
$404.56
Each
units
Phase 160 → 300 V ac DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - -
RS Stock No. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
$141.17
Each
units
Phase 220 → 240 V ac, 380 → 440 V ac SPST - 1, 3 - - - - NEUTRAL 150 ms - - -
RS Stock No. 111-3110
Mfr. Part No.K8DT-VS2TD
BrandOmron
$184.72
Each
units
Voltage 24 V ac/dc SPST Overvoltage, Undervoltage 1 1 → 10 V, 15 → 150 V, 3 → 30 V - - - - 250 ms - - -
RS Stock No. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
$377.40
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS Stock No. 890-3875
Mfr. Part No.2902035
$809.16
Each
units
Current, Voltage 9.6 → 30 V dc SPDT - - 0 → 12 V Overcurrent 0mA 24mA - - - - -
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. 146-519
Mfr. Part No.RM17UBE15
$397.92
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 775-8009
Mfr. Part No.1SVR730841R0500
BrandABB
$350.24
Each
units
Current 110 → 130 V ac DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 819-3214
Mfr. Part No.K8AK-AS3 24VAC/DC
BrandOmron
$193.51
Each
units
Current 24 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
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