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MEDIUM VOLTAGE SWITCHGEAR 2400, 4160, 7200, 13800 VOLTS
ALLIS CHALMERS, SIEMENS ALLIS, SIEMENS

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:

  - AM150A      600 and 1200 amp, 4160 volt
  - AM250A     600 and 1200 amp, 4160 volt

These SWITCHGEAR was developed utilizing the vertical lift design. The breakers had primary drawout clusters, while the switchgear contained stationary stabs in phenolic cylinders.

In the mid 1950’s ALLIS CHALMERS followed its original designs for 4160 volt breakers with a series of breakers and  also called the AM and for higher voltages the MC series. The MC series had new design characteristics.  -

The AM series was characterized by the continued use of a vertical lift mechanism and a open door drawout design. The circuit breakers of this series were designated:
  - 50C
  - 100C
  - AM150 B.C.D.E
  - AM 250 B,C,D,E

The MC series was characterized by the use of \a horizontal drawout mechanism, and an open door drawout design.

The breakers were designated:
  - MB250
  - MB500
  - MC500

In the 1960’s ALLIS CHALMERS radically changed its horizontal drawout design of medium voltage breakers and switchgear and developed the MA, FB and FC series of circuit breakers.

The above designs were designated:
  - MA 75
  - MA150 A,B,C,C1
  - MA250 A,B,C,C1
  - MA350
  - FA350
  - FB250 A,B
  - FB500 A,AI,B
  - FC500 A,A1,B
  - FC750 A,A1,B
  - FC1000 A,A1,B

This later set of designs was made available in indoor, outdoor non-walk-in and outdoor walk-in configurations.
The air circuit breaker designs of ALLIS CHALMERS were eventually changed in the 1970’s by SIEMENS ALLIS when they developed their first line of horizontal drawout vacuum circuit breakers. These breakers were designated . The switchgear assemblies were designed to accept the circuit breakers in a 2 high, horizontal drawout, closed-door configuration. From the insulation standpoint, line and load bus details were isolated from one another. This vacuum switchgear was available in indoor, outdoor non-walking and outdoor walk-in configurations.

Subsequent to the initial design, SIEMENS developed the GMI vacuum circuit breaker and switchgear system. This up rated system continued the basic design principles developed by in the design. These newly designed breakers were designated

  - 50GMI 250
  - 50GMI 350
  - 75GMI 500
  - 150GMI 500
  - 150GMI 750
  - 150GMI 1000

The Medium Voltage Air Circuit Breakers and the 1st generation of vacuum circuit breakers manufactured by ALLIS CHALMERS, SIEMENS ALLIS and SIEMENS have been obsoleted...

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

Replacement Parts for the majority of all ALLIS CHALMERS, SIEMENS ALLIS and SIEMENS switchgear assemblies 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 Switchgear manufactured ALLIS CHALMERS, SIEMENS ALLIS and SIEMENS.

In regards to Replacement and Renewal parts for Medium Voltage Air Circuit Breakers Satin International Stocks all components for all generations of Medium Voltage Switchgear manufactured ALLIS CHALMERS, SIEMENS ALLIS and SIEMENS.

  - Complete switchgear assemblies
  - Front Doors, Rear Doors,
  - Copper Bus, Aluminum Bus, Insulated Bus
  - Primary Stationary Disconnects,
  - Secondary Stationary Disconnects,
  - Insulation Details, Backboards, Bracing
  - Operating Handles,
  - Drawout Carriages, Pantographs,
  - Control Switches, Potential Transformers, PTS
  - Current Transformers, CT’s,
  - Ammeters, Voltmeters, Watt-hour Meters
  - Red and Green Indicating Lights
  - Ammeter Switches, Voltmeter Switches