Westinghouse Switchgear Products (DC)

For many years, Westinghouse Electric Corporation was deeply involved in circuit breaker technology - designing, manufacturing and installing a wide variety of DC breakers for critical applications in the metals, paper and petrochemical industries, as well as for rapid transit systems around the world.

And, during those years, Westinghouse, through its Homewood Parts and Products Division, actively supported this extensive installed base with parts, service and technical assistance, as well as complete product rebuilds. In 1995, this division was acquired by its management group and renamed Homewood Products Corporation.

Now, this restorative service is available for every Westinghouse DC breaker built over the last 80 years, as well as for breakers from other manufacturers. All can be retrofitted to like-new status with the only American-designed-and-manufactured, high-quality components available anywhere in the world.

DM2F/DM2R:
This is a high-speed DC breaker available in 2000, 4000 and 6000-ampere ratings for application at 750, 1000 and 1500 volts. The DM2F meets ANSI Standard C37.014 and has been tested in circuits capable of delivering over 217.5kA peak current. The short time rating is 75 kA and the short circuit rating is 139 kA. Yet its high-speed action (1/60th sec.) effectively limits current rise.

The DM2F utilizes a mechanically held, magnetically actuated mechanism that opens fast enough to limit letthrough fault current. Due to its magnetic actuator, the steeper the rate of current rise the faster the breaker operates. In fact, a competitive breaker manufacturer's study named the DM2F "the fastest operating breaker, under both fault and no-fault conditions," of all of the DC breakers tested.

This breaker is available with standard finger cluster, primary bus connections for drawout applications, or with a standard bus connection hole pattern for fixed mounting. Additional options include a passive magnetic "rate-of- rise" trip, a choice of adjustable overcurrent trips (for either forward or reverse direction), and up to ten auxiliary contacts.

DMD:
This is a semi-high-speed DC breaker also available in 2000, 4000 and 6000-ampere ratings for application at 750, 1000 and 1500 volts. The DMD has a peak current rating of 100,000 amperes both mechanically and electrically, and meets all of the applicable ANSI Standards.

The DMD is electrically operated and uses either a "Rate of Rise" trip, a shunt trip or an undervoltage release.

The fixed configuration can be floor or pedestal mounted, and provides a standard bus connection hole pattern. The drawout configuration is available with standard finger cluster connectors.

DR:
This is a semi-high-speed DC breaker available in 2000 through 10,000-ampere ratings for application up to 750 volts. Its maximum ampere ratings are: 150,000 peak; 90,000 short time; and 150,000 short circuit.

A rugged, high-current unit, this breaker is electrically operated and uses either an instantaneous or inverse-time- delay trip, or a shunt, undervoltage or reverse current trip.

Fixed DR Breakers can be configured as open switchboard or metal enclosed. A truck-mounted breaker for metal enclosed units is available in the drawout configuration.

Homewood recognizes the logic of controlling costs by extending the service-life of vintage equipment which needs to be repaired to "meet specs." We can:

• comprehensively refurbish existing Westinghouse units;
• retrofit other manufacturer's existing units, using new breakers specially adapted to be "plug-in" compatible, whenever appropriate;
• replace non-repairable units with new "original spec'' circuit breakers containing state-of-the-art components;
• provide "original spec' components and parts for replacement and on-site maintenance.

A complete menu of new and remanufactured DC breaker parts and components allow your technicians to perform life-extending maintenance with minimal downtime. For your convenience, a parts list is included on the QUICK QUOTE. Simply check the needed parts and fax, or call for technical assistance and advice.