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ALLIS-CHALMERS 217530 Side view of Type D, 4.16 kv, 1200 Amp., Air Magnetic Circuit Breaker, Outer Phase Barrier Removed. ElectricalPartManuals . com,. .. 217525 A ALLIS-CHALMERS Arc Chute Assembly of Type D, 4.16 kv, 1200 Amp., Air Magnetic Circuit Breaker is tilted back for easy assembly of contacts. ...