Delta Changeover

Product Description

Delta Changeover

HSDT2CO & BSDT

GE POWER

The HSDT2CO Series and BSDT Series are Star Delta Timers which havebeen designed specifically to meet the requirementsfor starting squirrel cage motors by star-delta change over. They have a runup time settable from 0-30 sec and give a fixed 50msec (40 to 70ms)changeover delay time. This changeover delay prevents the overlappingoperation of star and delta contactors. This in turn prevents possiblesparking, thus protecting contactors and motors from damage. The outputis 1 NO contact each for star & delta relay for HSDT2CO series timer and 1NO contact for BSDT series timer.

Features :

• Repeat accuracy better than 0.5%
• Finger guards for safety
• DIN rail / Screw mounting
• Slim space saving construction

GE has the widest range of Power Contactor in India today (6A to 825A, AC3). To ensure trouble free and smooth operations of yourstar delta starters, insist on GE make CL & CK contactors with HSDT2CO Star-Delta Timer (with 2 changeover contacts) and BSDTStar-Delta Timer (with 1 changeover contact)

Operating Principle - Two changeover - HSDT2CO

Timer gets the supply as soon as switch S2 is closed. Starcontact (15/18) of the timer closes which in turn gives supply tothe star contactor K1 and the set runup time starts. At the sametime mains contactor K2 is switched on via the auxiliarycontact of star contactor K1 and then becomes self-holdingvia its own auxiliary contacts. Star contact of the timer opensat the end of run-up time, thus switching off the supply voltageof the star contactor. The second delay starts after star
contactor opens. At the end of this delay, the delta contact(25/28) of the timer closes, starting the delta contactor K3. Thedelta contactor, thereafter remains on until power isdiscontinued.

Operating Principle - One changeover - BSDT

Star contactor K1 closes and the set run-up time starts whenthe supply voltage is applied. Mains contactor K2 is switchedon via the auxiliary contacts of star contactor K1 and thenbecomes self-holding via its own auxiliary contact 13/14.Simultaneously, auxiliary contacts 21/22 of mains contactor K2open, thus connecting the star-delta timer and the starcontactor via its auxiliary contacts 43/44 to the supply.Contacts 15/16 of star-delta timer open after the run-up time,
thus switching off the supply voltage of the timer and of thestar contactor. Contact 15/16 of star-delta timer remains openfor approx. 50msec and resets after that time to ensure thatstar contactor K1 has opened. Delta contactor K3 has beenconnected via auxiliary 22/21 of star contactor K1.

Reliable Power Switching for Demanding Applications

Deltas panel-mounted changeover switch is crafted for seamless transitions between mains and generator supply in industrial and commercial settings. It supports high current loads and offers superior insulation resistance, contributing to uninterrupted power and operational safety. Its design adheres to stringent quality and safety standards, ensuring long-lasting performance.


Durable Construction with Enhanced Safety

Built using high-grade, flame-retardant polycarbonate, the changeover switch guarantees user safety and resilience in challenging environments. Engineered with silver-plated copper contacts, it delivers excellent electrical conductivity and minimizes wear, ensuring reliability throughout its service life.