Molded case circuit breaker with calibration adjusting means for a bimetal

An electrical circuit breaker comprising;

• a first electrical contact,
• a second electrical contact,
• spring-powered operating means for moving said first and second electrical contacts into engagement and out of engagement, and
• trip means for actuating said operating means comprising;
• a trip bar rotatably mounted within said circuit breaker,
• a thermally actuated bimetal having a portion thereof movable about a pivot point toward and away from said trip bar in response to predetermined overload conditions,
• a formed intermediate control lever physically distinct from said bimetal for adjusting the position of the movable portion of said bimetal relative to said trip bar, said intermediate control lever being mechanically coupled to said bimetal at a location adjacent said pivot point, and
• a rotatable calibration adjustment component for adjusting the spatial disposition of said intermediate control lever in said circuit breaker, said calibration adjustment component having a threaded portion that is in threadable engagement with a stationary part of said trip means and said calibration adjustment component also being of such length that an end thereof engages said intermediate control lever at a location remote from said pivot point so that rotation of said calibration adjustment component causes said intermediate control lever to pivot and thereby adjust the spatial disposition of the movable portion of said bimetal relative to said trip bar.