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. 857-7182
Mfr. Part No.DIB01CB235A
MYR1,017.90
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6s - - -
New
RS Stock No. 209-8591
Mfr. Part No.DPB02CM44
MYR927.20
Each
units
Voltage - SPDT - 3 - - - - - - - - -
RS Stock No. 179-9431
Mfr. Part No.RM22TA31
MYR628.07
Each
units
Phase - DPDT Overvoltage 3 <100V ac - - - - 30s - - -
RS Stock No. 806-5939
Mfr. Part No.1SVR740670R0200
BrandABB
MYR1,167.27
Each
units
Insulation 24 → 240 V ac/dc DPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 859-3027
Mfr. Part No.DUA52C724
MYR617.28
Each
units
Voltage - SPDT Undervoltage - 8 → 28V dc - - - - <200ms - - -
RS Stock No. 179-3520
Mfr. Part No.184755 & EMR6-I15-B-1
BrandEaton
MYR818.90
Each
units
Current - - - 1 - - 0.3 → 1.5 A, 1 → 5 A, 3 → 15A 1.5 A, 5 A, 15A - 0.1 → 30s - - -
RS Stock No. 775-7949
Mfr. Part No.1SVR730760R0400
BrandABB
MYR1,131.37
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - -
RS Stock No. 794-3954
Mfr. Part No.MI91BL
BrandGIC
MYR188.67
Each
units
Frequency - SPDT - 3 - - - 6A - 100 ms, 500ms - - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
MYR915.93
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 914-4632
Mfr. Part No.ICC 24Vac
BrandHiquel
MYR582.56
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent - - - - - - -
RS Stock No. 819-3251
Mfr. Part No.K8AKPA2380480VAC
BrandOmron
MYR575.62
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.1 → 30s - - -
RS Stock No. 111-3131
Mfr. Part No.K8DT-TH2CA
BrandOmron
MYR563.44
Each
units
Temperature - SPDT - - - - - - - - Overtemperature 0 → +1800°C -
RS Stock No. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
MYR961.79
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - - - - -
RS Stock No. 179-3529
Mfr. Part No.184763 & EMR6-AW300-C-1
BrandEaton
MYR937.23
Each
units
Phase, Voltage - - - - 160 → 300V ac - - - - 0.1 → 30s - - 50 → 60Hz
New
RS Stock No. 213-1220
Mfr. Part No.3RR2142-1AA30
BrandSiemens
MYR642.39
Each
units
Current - SPDT - 2 - - - - - - - - -
RS Stock No. 181-2776
Mfr. Part No.MK5880N.38/200 DC24V 5-100kOhm VW10k-5MOhm
BrandDold
MYR1,302.53
Each
units
Insulation - SPDT - - 0 → 500V ac - - - - - - - -
RS Stock No. 876-2551
Mfr. Part No.1SVR560730R3402
BrandABB
MYR3,715.58
Each
units
Frequency, Voltage - SPDT Overvoltage, Undervoltage 1, 3 - - - - - ±20ms - - 40 → 70Hz
RS Stock No. 291-3150
Mfr. Part No.IL9079.12/002 3AC230/400V 0.55-1.05UN 0.2-2S
BrandDold
MYR1,258.96
Each
units
Voltage - DPDT Undervoltage 3 - - - - - 0.2 → 2s - - -
RS Stock No. 123-9731
Mfr. Part No.K3IM5AACL20 230VAC
BrandTele
MYR833.36
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent - - - - - - -
RS Stock No. 850-5370
Mfr. Part No.LXPRT 280-520VAC
MYR365.32
Each
units
Phase, Voltage - SPDT Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -