molded case circuit breakers - Eaton Canada

SWITCHGEAR (LOW VOLTAGE)
DB Assemblies, Power Circuit Breakers
and Renewal Parts
PRODUCT DESCRIPTION
DB Switchgear with DB Air Circuit Breakers
REPLACEMENT CAPABILITIES
Remanufactured DB-25 Breaker
Including Digitrip RMS 810 Trip Unit
March 2001
Low Resolution Photo
Westinghouse DB switchgear used the DB
breaker in its design. Among the breakers
used were the DB15, DB25, DB50, DB75,
DB100 and the current limiting type DBL25
and DBL50. A characteristic of the DB
switchgear was that the panel door could
be kept closed when the breaker was in
the open, test and disconnected position
of the three-position DB breaker. The single
position DB breaker also had this feature
but did not have a test position. In
either case, both the three- and single-position
DB breakers utilized the electromechanical
trip unit.
The DB switchgear structures were
approximately 90 3/8-inch high construction
with a universal frame that accommodated
Cutler-Hammer offers an extensive amount
of products to support DB Switchgear:
New DB Air Circuit Breakers
Completely new factory manufactured
breakers are still available for DB25, DB50,
DBL25, DBL50, DBF6 and DBF16.
Remanufactured DB Breakers and Factory
Repair Service
Factory remanufacturing of most frame
sizes of DB circuit breakers are available.
All are asbestos-free, in accordance with
ANSI C37.59, calibrated per original specifications
and equipped with Digitrip RMS
510 trip units as standard.
235
breaker compartment widths of 18, 26, 30
and 36 inches All main bus joints and tap
connections are silver plated and tightly
clamped with through-bolts to insure
maximum conductivity. The outdoor
switchgear was a walk-in type with
rear hinged doors for easy access to
connections.
Ratings
DB Switchgear Bus 800 – 4000A
DB Breaker 15 – 4000A
Voltage 208 – 600V
Interrupting Capacity 15 – 150kA
Chronology
This switchgear started in East Pittsburgh,
PA approximately 1950 and final production
ended around 1980.
DB Breaker Parts
A complete line of DB breaker replacement
parts are available built from the original
drawings and design specifications. Among
the items stocked are asbestos-free arc
chutes, complete pole units, contacts,
primary disconnects and coils.
DB Switchgear Structure Parts
DB switchgear parts are available for most
DB designs. Newly manufactured replacement
parts (such as doors, breaker provisions,
lift trucks, metering, etc.) are
available.
Digitrip Trip Unit Retrofit Kits
Trip unit retrofit kits are available for all
DB breaker frames. Refer to pages 256-
257 of this publication.
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