ENERGY ABSORBING CONTACT ARM STOP

摘要

A circuit breaker cassette (10) comprises a housing (14) having a fixed contact (24), and a movable contact (26) on a contact arm (30). The contact arm (30) is positionable in a closed position and an open position, wherein the contact arm (30) is closed when the movable contact (26) is in contact with said fixed contact (24). A spring (40) biases the movable contact arm (30) towards the closed position. A kinetic energy-absorbing stop (36) is positioned to absorb kinetic energy of the contact arm (30) resulting from magnetic repulsive forces forcing the movable contact (26) and the fixed contact (24) apart during a short circuit condition. The kinetic energy-absorbing stop (36) comprises a material more resilient than material forming said housing (14).