Low tolerance magnetic trip for a miniature circuit

A circuit breaker comprising:

• a first electrical contact connected to a first terminal;
• a movable second electrical contact which is engaged to the first electrical contact in a closed position to allow current flow and is disengaged from the first electrical contact in an open position to interrupt current flow;
• a trip actuator assembly including:
• a movable armature having a front side and a back side with an opening extending from the front side to the back side,
• a yoke arranged adjacent to the back side of the armature, the yoke including a tab arranged adjacent to the opening on the back side of the armature,
• a reset spring to apply a force that biases the armature toward the trip lever, and
• a bimetallic member, electrically connected between the second electrical contact and a second terminal, to generate a magnetic field which produces a magnetic flux in the armature and yoke when current flows through the bimetallic strip, the magnetic flux creating an attractive force, which counters the force of the reset spring, to move the armature toward the yoke in the event of an overcurrent condition;
• and
• a pivotable trip lever having an end which is latched in the opening of the armature in the closed position and is unlatched by movement of the armature from the opening of the armature into a tripped position to move the second electrical contact into the open position in the event of the overcurrent condition, the end of the trip lever having first, second and third surfaces,
• wherein, when the trip lever is latched in the opening, the first, second and third surfaces of the end of the trip lever make contact with a front surface of the armature, an interior surface of the armature defining the opening, and the tab of the yoke, respectively, to provide a consistent magnetic gap between the back side of the armature and the yoke.