W-PR3 3ØUNDER, OVER AND VOLTAGE UNBALANCE WITH ADJUSTABLE TIME DELAY & SELECTABLE VOLTAGE

Operation

The W-PR3 Phase Protection Relay is a digital electronic instrument designed for AC voltage monitoring and protection in 3 phase 4 wire and 3 phase 3 wire system. Used in application such as main failure, phase sequence, phase unbalance, under and over voltage. The W-PR3 is a designed to monitor the correct phase sequence of 3 phase system. With correct phase sequence applied the output relay will energizes and remains de-energized if an incorrect sequence is applied, the display will show “Pr”. When the measured voltage moves outside the set-point limit, the relay will de-energize after the time delay, it operates automatically and shut down your motor before any damage is done. The relay will automatically reset to energize when the input voltage is raised past the set-point plus the hysteresis value and the adjustable delay period starts. At the end of timed period the relay will automatically energize again. The time setting adjustment range is 0 to 15 min. Should any phase fail, the output relay will de-energize.

AC voltage protectors offer user adjustable set-point. The set-point adjustment between 10% and 20% of the nominal supply for over voltage unit and between 2% and 20% for the under and voltage unbalance. The time delay function can be used to prevent nuisance tripping due to any phase fail. The last fault can be checked by pressing “∆” and the LED will show the fault condition.  Line voltage is selected with Dip switch on top (380, 400 or 415 VAC). The trip-point is automatically calculated by the microcontroller. The case can be mounted on a DIN rail 35mm and adapter plate is available for wall mounting.

Specification

Feature

Range

Time

Relay output

Environmental

Enclosure

The product should not be dispose of a household refuse.

Product Codes