Electrical circuit breaker device

An electric circuit breaker comprising

• a housing,
• a stationary electrical contact,
• a movable contact mechanism having a movable electrical contact movable between a contacts closed position in engagement with the stationary contact and an open contacts position out of engagement with the stationary electrical contact,
• a stop surface,
• a toggle mechanism having at least three links interconnected to form a chain, each link having first and second ends, a first link being pivotably connected to the housing at a location intermediate to the first and second ends thereof, the second end of the first link connected to the first end of the second link forming a first movable joint, the second end of the second link connected to the first end of the third link forming a second movable joint, the second end of the third link connected to the movable contact mechanism, the first movable joint being movable between first and second opposite sides of a first imaginary straight line extending through the pivotable connection of the first link to the housing and the second movable joint, the first movable joint being limited in movement in one direction on the first side of the first imaginary straight line by the stop surface at a location closely adjacent to the first imaginary straight line, and the second movable joint being movable between first and second opposite sides of a second imaginary straight line extending through the first movable joint and the second end of the third link, the second movable joint being limited in movement in one direction on the first side of the second imaginary straight line by the stop surface at a location closely adjacent to the second imaginary straight line, a first spring member biasing the second movable joint toward the first side of the second imaginary straight line,
• a first force applying member for applying a force to the first link to move the first movable joint against the stop surface and a second overload responsive member movable upon an overload to apply a tripping force to the linkage mechanism to move the second movable joint to the second side of the second imaginary straight line,
• the movable electrical contact being engageable with the stationary electrical contact only when the first and second movable joints are engaged with the stop surface on the first side of their respective imaginary straight lines.

An electrical circuit breaker comprising

• a housing,
• a stationary electrical contact,
• a movable contact mechanism having a movable electrical contact movable between a contacts closed position in engagement with the stationary contact and an open contacts position out of engagement with the stationary electrical contact,
• a toggle mechanism having at least three links pivotably connected together to form a chain, each link having first and second ends, the first link being pivotably connected to the housing at a location of the link intermediate to the first and second ends thereof, a first force applying member for applying a force to the first end of the first link and the second end of the first link jointed to the first end of the second link forming a first movable joint, the second end of the third link jointed to the movable contact mechanism and the first end of the third link jointed to the second end of the second link forming a second movable joint,
• a first imaginary straight line extending through the pivotable joint of the first link with the housing and the joint at the second end of the second link and a second imaginary straight line extending through the first movable joint and the joint at the second end of the third link,
• the movable joints being movable between positions on opposite sides of their respective imaginary straight lines,
• a stop surface limiting movement of the movable joints in one direction to a position on one side of their respective imaginary straight lines closely adjacent thereto,
• a second, condition responsive, force applying member for applying a force on the second movable joint in the direction toward the side of the respective imaginary straight line opposite to the stop surface, and
• the movable electrical contact being engageable with the stationary electrical contact only when both the first and second movable joints are engaged with the stop surface.