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Mitsubishi Electric Power Products, Inc. (MEPPI) Design Practices

  • SST ground pads
  • Adjustable legs
  • Galvanized frame
  • Aluminum tanks
  • Slip-over BCTs
  • Protected linkage and gas system (inside cabinet)
  • Optional composite bushings
  • Meets ANSI and IEC standards
  • True puffer interrupter
  • Fifteen minute contact inspection/change out
  • Two-part gas sealing system: EPR-O Rings at all static joints, RTV to seal-out the external environment
  • Totally enclosed gas handling system
  • Minimal connection interfaces
  • Two lubrication points and timing test every six years
  • 400kA accumulated fault or 2,000 full-load operations before internal inspection
  • Easy contact inspection/replacement with bushings in place
  • Galvanized support structure, aluminum tanks, three mil cabinet paint
  • Well-trained field engineers and technicians
  • Experienced and capable engineering and manufacturing staff
  • Culture of teamwork focused on servicing our customers
  • Enthusiastic field sales reps who share this culture


Ratings (Tested to ANSI/IEEE and IEC Standards or Higher)


Breaker Type

70SFMT-32F Close and Latch Capabilities 60kA RMS; 85kA Crest
Maximum Voltage 72.5kV Rapid Duty Cycle O-0.3s-CO-15sec-CO-50sec-CO
Nominal Voltage  34.5kV-69kV

Opening Time

28ms (1.7cycles)
Full Load Current  1,200A, 2,000A, 3,000A Closing Time 100ms (6.0 cycles)
Short Circuit Current  31.5kA Interrupting Reclosing Time 333ms (20.0 cycles)
Interrupting Time 3 cycles Gas Pressure 71psig (5kg/cm2) @ 68 degrees F
Frequency 60Hz Rated Altitude 1,000m (3,300 ft.)
Full Wave Withstand 350kV BIL Temperature Range (Standard) 40-30 degrees C
Bushing Creep (Standard) 1315mm (51.55 in.)  Min. Temperature w/ Heaters -50 degrees C
Low Frequency Withstand 160kV Seismic Level IEEE 693 (1997)
Permissible Trip Delay 2 seconds