Oil Immersed Fully Automatic Auto Transformer Starters Type "AT/O/AUTO"  For Squirrel Cage Motors
(upto 500 HP)

"KEI" make type "AT/AUTO" fully automatic oil immersed auto transformer starter consisting of 3 air break contactors, having sheet steel clad, floor mounting with oil immersed auto transformer etc., suitable for 400/440 Volts, ±6%, 3 Phase, 50Hz, mainly fitted with:

• 3 Nos. - Air Break power Contactors of suitable rating one each for STAR, RUN & MAIN connections.

• 1 No. - Bimetallic overload relay of suitable rating for overload protection.

• 2 Nos. - Sets of ON & OFF delay timer on delay of 0-30 seconds mounted on STAR contactor.

• 2 Nos. - Push buttons for Motor Start & Motor Stop conditions.

• 3 Nos. - Suitably rated CTs having 5A secondary for Ammeter.

• 1 No. - Stem type thermostat range 0-90⁰C for protection of transformer overheating.

• 1 No. - Ammeter of suitable rating.

• 1 No. - Voltmeter of suitable rating.

• 1 No. - Oil immersed auto transformer without oil, with 50%, 65% and 80% tappings.

The auto transformer will be suitable for 2 starts / hour equally spread. The starting time of the motor should not exceed 20 seconds duration.

 Note:

1. Any accessories other than those mentioned above can be provided at an extra cost on request.