Home > Cutler Hammer / Westinghouse > Air Circuit Breakers > Medium Voltage Air Circuit Breaker Information

MEDIUM VOLTAGE AIR & VACUUM CIRCUIT BREAKERS
2400, 4160, 7200, 13800 VOLTS
WESTINGHOUSE, EATON, & CUTLER HAMMER

In the 1940’s and early ‘50s, WESTINGHOUSE manufactured its first line of medium voltage circuit breakers and associated switchgear. The models produced were the:

  - 50DH50       600 and 1200 amp, 4160 volt
  - 50DH75      600 and 1200 amp, 4160 volt
  - 50DH150     1200 and 2000 amp, 4160 volt
  - 50DH250 1200 and 2000 amp, 4160 volt
  - 75DH250 1200 and 2000 amp, 7200 volt
  - 75DH500 1200 and 2000 amp, 7200 volt
  - 150DH250 1200 and 2000 amp, 14400 volt
  - 150DH500 1200 and 2000 amp, 14400 volt

These circuit breakers were developed utilizing the horizontal drawout design. The breakers had primary drawout clusters, while the switchgear contained stationary stabs in porcelain or plastic cylinders.

In the mid 1950's GENERAL ELECTRIC followed its original designs with a series of breakers also called the DH series. This series was characterized initially by the continued use of solenoid operated closing mechanisms, and a open door drawout design. The circuit breakers of this series were designated:
  - 50DH50A
  - 50DH75E
  - 50DH150A,D,E
  - 50DH250A,D,E
  - 50DH350E
  - 75DH250D,E
  - 150DH500E
  - 150DH750
  - 150DH750E
  - 150DH1000
  - 150DH1000E

The above breakers were offered in a number of models with amperage ranges from a low of 600 amps for some designs to 3000 amps for other designs.

A number of the earlier models with identical Type Designations to Later models are not interchangeable

In the 1960’s WESTINGHOUSE radically changed its horizontal drawout design of medium voltage breakers and developed the DHP series of circuit breakers. These units were originally offered with solenoid operated closing mechanisms, but eventually the design was changed to stored energy. The insulation of the breaker was originally a porcelain casting design which was eventually changed to a post insulator design.
 
The above designs were designated:
  - 50DHP75
  - 50DHP250
  - 50DHP350
  - 75DHP500
  - 150DHP500
  - 150DHP750
  - 150DHP750C
  - 150DHP1000

The Medium Voltage Circuit Breakers manufactured by WESTINGHOUSE have been obsoleted...

All original Complete Circuit Breakers are available directly from the Satin International and Satin American Corp.

Replacement Parts for the majority of all WESTINGHOUSE CIRCUIT BREAKERS are in stock and available from Satin International.

Along with Renewal Parts, Satin International maintains an extensive library of original Instruction Books, Sales Catalogs, Blue Print Documentation, and Replacement Parts Information for all Circuit Breakers manufactured WESTINGHOUSE.

In regards to Replacement and Renewal parts for Medium Voltage Air Circuit Breakers Satin International Stocks all components for all generations of Medium Voltage Air Circuit Breakers manufactured by WESTINGHOUSE.
  - Stationary main contacts, contact kits and contact assemblies,
  - Movable main contacts, contact kits, and each contact assembly,
  - Stationary arcing contacts, contact kits, and contact assemblies,
  - Movable arcing contacts, contact kits, and each contact assembly,
  - Arc Chutes,
  - Electrical and Manual Operating Mechanisms,
  - Closing Mechanisms, Closing Assemblies, Stored Energy Mechanisms
  - Bushing Assemblies, Pins, Castings, Supports, Barriers, Insulation,
  - Electromechanical Trip Devices, Solid State Trip Devices, Trip Units,
  - Trip Coils, 24 volts dc, 48 volts dc, 125 volts dc, 250 volts dc,
  - Trip Coils, 120 volts ac, 240 volts ac, 480 volts ac
  - Closing Coils, 24 volts dc, 48 volts dc, 125 volts dc, 250 volts dc,
  - Closing Coils, 120 volts ac, 240 volts ac, 480 volts ac
  - Undervoltage Coils and  Undervoltage Devices, 24 volts dc, 48vdc, 125vdc, 250vdc
  - Undervoltage Coils and Undervoltage Devices, 120 volts ac, 240 volts ac, 480 volts ac,
  - Closing relays 24 volts dc, 48 volts dc, 125 volts dc, 250 volts dc,
  - Closing relays 120 volts ac, 240 volts ac, 480 volts ac
  - Anti Pump Relays,
  - Charging Motors 24 volts dc, 48 volts dc, 125 volts dc, 250 volts dc,
  - Charging Motors 120 volts ac, 240 volts ac
  - Pole Assemblies and Pole Bases,
  - Secondary Disconnect Devices and Disconnect Contacts,
  - Primary Disconnect Clusters and Assemblies,
  - Dust Covers,
  - Drawout Assemblies, Racking Mechanisms
  - Closing Handles, Escutcheon Plates,
  - Inter Phase Barriers,