The Square D Homeline Load Centers and Circuit Breakers, HOMFPCP are part of a comprehensive family of circuit protection solutions, Plug on neutral load centers. Their primary functions are to provide a means to manually open a circuit and automatically open a circuit under overload or short circuit conditions. Thermal-magnetic circuit breakers use bimetals and electromagnetic assemblies to provide overcurrent protection. For higher level (short circuit) overcurrents, instantaneous trip characteristics allow molded case circuit breakers to interrupt with no intentional delay. This is accessory for LA/FA molded case circuit breakers provides the walking beam assembly components for walking beam mechanical interlock.