Contact system for a circuit breaker

A circuit breaker having a mechanism portion, a contact system portion and an arc chamber portion, the circuit breaker comprising:

• a first coupling member operatively coupled to a drive link of the mechanism portion, the first coupling member rotatable about a first shaft;
• a second coupling member pivotably coupled to the first coupling member and to a second shaft;
• a plurality of fixed contacts;
• a moveable contact arm assembly comprising a plurality of moveable contact arms, each of the plurality of moveable contact arms having a moveable contact disposed thereon, the moveable contact arm moveable to position each moveable contact into engagement with a respective fixed contact of the plurality of fixed contacts to define a closed condition and out of engagement with the plurality of fixed contacts to define a blow open condition;
• a carrier assembly operatively coupling the plurality of moveable contact arms to each other;
• a latch plate operatively coupled to the carrier assembly and to the second shaft;
• a trip shaft operatively coupled to the carrier assembly, the trip shaft having a non-circular region defining an engagement surface disposed in contact with the latch plate in the closed condition;
• and
• a biasing portion of one of the plurality of moveable contact arms, the biasing portion disposed proximate the trip shaft in the closed condition and configured to rotate the trip shaft out of engagement with the latch plate.