Abstract: A plug-in contact system for a plug-in type circuit breaker is disclosed. The movable contacts are easily engaged within the circuit breaker by the design of the contact support which includes a guiding protrusion, thus lowering the necessary insertion force. The stationary contacts provided on a fixed base, to which the circuit breaker may be plugged in, may be provided with modular contact supports. In addition, a shutter arrangement provides protection to the stationary contacts when a plug-in breaker is withdrawn from the fixed base.

Abstract: An interface for a plug-in circuit breaker for carrying auxiliary components is disclosed. The interface includes a substrate having a base surface secured to the circuit breaker and a mounting surface. A plurality of auxiliary contact blocks, each carrying eight auxiliary contacts, can be mounted on the mounting surface. A plurality of rating plugs, for avoiding insertion of a wrong breaker into a plug-in base, may further be mounted on the mounting surface. The interface may further include a plurality of tunnel-shaped passageways for routing auxiliary circuit wires and preventing their interference with moving parts of the breaker.

Abstract: An interface for a plug-in circuit breaker for carrying auxiliary components is disclosed. The interface includes a substrate having a base surface secured to the circuit breaker and a mounting surface. A plurality of auxiliary contact blocks, each carrying eight auxiliary contacts, can be mounted on the mounting surface. A plurality of rating plugs, for avoiding insertion of a wrong breaker into a plug-in base, may further be mounted on the mounting surface. The interface may further include a plurality of tunnel-shaped passageways for routing auxiliary circuit wires and preventing their interference with moving parts of the breaker.

Abstract: In an exemplary embodiment of the invention, a plug-in contact system for a plug-in type circuit breaker is provided. The movable contacts are easily engaged within the circuit breaker by the design of the contact support which includes a guiding protrusion, thus lowering the necessary insertion force. The stationary contacts provided on a fixed base, to which the circuit breaker may be plugged in, may be provided with modular contact supports. In addition, a shutter arrangement provides protection to the stationary contacts when a plug-in breaker is withdrawn from the fixed base.

Abstract: A draw-out arrangement for molded case circuit breakers is disclosed. A circuit breaker plug-in system generally comprises a plug-in base to which the draw-out mechanism is secured. The base includes a right plate and a left plate. A circuit breaker is movable between the right plate and the left plate and is retractably connected to the plug-in base by the action of the draw-out mechanism. The draw-out mechanism of the present invention includes a shaft connecting the right plate to the left plate which provides rigidity to the system and balances the circuit breaker during movement. When a crank is inserted into the draw out mechanism and used to rotate a lead screw connected therein, a rider positioned about the lead screw is prevented from rotating due to being sandwiched between a pair of plates. Movement is thereby translated into linear motion which is used to move the circuit breaker into or out of engagement with the plug-in base.