UNDER VOLTAGE RELAY

FEATURES

  • Adjustable ON/OFF-Time delays provided.

  • Common setting for all the phases.

  • Adjustable On/Off voltage differential (Back-lash).

  • Unaffected by frequency variations.

  • Positive action without chattering.

  • Both Din rail & Screw mounting provided.

  • Life time guarantee of the unit (conditions apply).

----------------------------------------------------------------------------------------------------------------

DESCRIPTION

This is a compact micro-electronic device based on latest technology. It senses the voltage supply at its terminals and operates electromagnetic relay. The relay gets de-energised for under voltage conditions i.e. when any phase voltage falls below the set value and gets energised after the voltage rises above the set value plus the ON/OFF differential setting. OFF-Time delay & ON-Time Delay is available for protection against transients. Under voltage setting and time delay are continuously adjustable with the help of a knob over a linear calibrated dial. Auxillary voltage of 12V or 24VDC can be provided, if the trip time

 

delay is required in the event of total supply failure to the unit. Two change over contacts are provided for customer usage. Three LED's ( light emitting diodes) are provided on top of the unit to indicate 'Voltage Supply On', 'Relay ON' and 'Under Voltage' Condition.

-----------------------------------------------------------------------------------------------------------------------------------------------------

STANDARD MODELS

THREE PHASE WITH  NEUTRAL-3PN

Under Voltage Setting 170-220

ON/OFF Differential (Backlash) : 7-20 VAC
Off Time Delay 1-15 Seconds.
On Time Delay 1-15 Seconds.

------------------------------------------------------------------------------------------------------------------------------------------------

THREE PHASE  WITHOUT NEUTRAL-3P

Under Voltage Setting 300-400 VAC

ON/OFF Differential (Back-lash) : 10-30 VAC

ON Time delay 1-15 Seconds.

Off Time delay 1-15 seconds.

-----------------------------------------------------------------------------------------------------------------------------------------------------

TWO PHASE-2P

Under Voltage Setting 300-400 VAC

ON/OFF Differential (Back-lash) : 10-30 VAC

ON Time delay 1-15 Seconds

Off Time delay 1-15 Seconds

-----------------------------------------------------------------------------------------------------------------------------------------------------

ONE PHASE 1P

Under Voltage Setting 170-220 VAC

ON/OFF Differential (Back-lash) 7-20 Volts

ON Time delay 1-15 Seconds

OFF Time delay 1-15 Seconds

------------------------------------------------------------------------------------------------------------------------------------------------------

SETTING / REPEAT ACCURACY

2% of the time and voltage setting.

 

MAXIMUM PERMISSIBLE OPERATING VOLTAGE

550 VAC for three / two phase system.

300 VAC for one phase system.

 

BURDEN

10VA (maximum)

 

INSULATION

The unit will withstand 2.5 KV 50 HZ for one minute between all A.C. Supply  terminals and relay connected together and body.

 

RELAY CONTACT RATING

6 Amps resistive load or 2 Amps inductive load at 230 VAC/440 VAC or 24 VDC

 

DIMENSION

Height 105 mm, Width 67mm, Length 102mm.
 

MOUNTING DETAILS