BQE - Single Phase Supply Monitoring Relay
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BQE - Single Phase Supply Monitoring Relay

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Application:  The BQE range of supply monitoring relay is designed to monitor a single phase supply for an under-voltage condition.

Description: 

  • Adjustable under-voltage.
  • Adjustable True trip delay time.
  • IP 65 enclosure
  • Option for Isolator and fuses.





Selection:

For the product to suit your application please see the selection chart below or contact sales:
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ProdRefSupply VoltageU/V Trip LevelTrip Delay TimeopenTimer TypeRelay ContactsEnclosure Typeenclosure typeIsolators & Fuses
BQE0703add to basketpdf download415Vac50-100%0.5-30 secsTrue2 pole C/O3No
BQE3703add to basketpdf download415Vac50-100%0.5-30 secsTrue1 C/O + 1 N/O4Yes


Trip Delay Timer
Where fitted the ‘Trip Delay Timer’ will inhibit the output contacts from releasing immediately a fault is detected.
The trip delay time is adjustable up to either 10 or 30 seconds depending on the model and will be either a ‘Standard’ delay or a ‘True’ delay type.
The 'Standard' delay type will require around 50% nominal supply voltage to be maintained for its operation, in the case of a total loss of power the unit
will trip with a minimal delay of approximately 0.5 seconds. This type of timer will allow the unit to ride through a short term voltage dip but not a total
power loss.
The 'True' delay timer is not dependent on the supply voltage for its operation. The timing function will be available in the case of either a partial or total
supply failure. This type of timer will allow the unit to ride through either a short term voltage dip or a total loss of power lasting up to 30 seconds.
Power On Delay Timer
Where fitted, the ‘Power On Delay Timer’ will delay the output contacts from energising immediately the supply voltage is applied to the unit for a period
of up to 30 seconds.
The supply voltage will have to satisfy the conditions set by the supply monitoring relay for a healthy supply continuously for the ‘Power On Delay’ timing
period before the output contacts will energise.
If the unit detects a fault and releases the output contacts the supply voltage will once again have to satisfy the requirements of a healthy supply continuously
for the ‘Power On Delay’ timing period before the output contacts will re-energise.