Circuit breaker auxiliary magnetic trip unit with pressure sensitive release

A circuit breaker comprising:

• an electrically insulative cassette halfpiece;
• a first electrically conductive strap arranged within said electrically insulative cassette halfpiece;
• a first fixed contact electrically connected to said first electrically conductive strap and a first moveable contact arranged opposite said first fixed contact, said first movable contact arranged to separate from said first fixed contact upon an overcurrent condition, the separation of said first movable contact from said first fixed contact forms an arc between said first fixed contact and said first movable contact creating pressurized gas;
• a latching mechanism configured to separate said first pair of electrical contacts;
• a first magnet yoke, said first magnet yoke superposes said first electrically conductive strap;
• a first armature pivotally disposed proximate to said first magnet yoke, said first armature arranged to move in a direction towards said first magnet yoke upon the overcurrent condition;
• a first lever arranged to restrain said first armature from moving in a direction toward said first magnet yoke during the overcurrent condition, said lever in response to a predetermined level of the pressurized gas, releases said first armature to move towards said first magnet yoke thereby urging said first armature to interact with said latching mechanism;
• said first magnet yoke includes first and second side arms, said second side arm having a slot and said first armature having a pivot arm at one end thereof and an actuator arm at an opposite end thereof, said pivot arm being partially captured within said slot, said first armature pivots about said pivot arm;
• and
• wherein said first lever includes:
• a first arm and a second arm extending from a common pivot, said first arm restrains said first armature from moving in a direction towards said first magnet yoke;
• and further including
• first link pivotally mounted at one end thereof and at an opposite end attached to said second arm of said first lever, said link in fluid communication with the pressurized gas, said first link rotates said first lever in response to the predetermined level of pressurized gas.