The MRCOOL MHK10U Universal Series Air Handler Heat Kit with Circuit Breaker is a supplemental electric heating accessory designed to provide additional warmth for compatible air handler systems. It works by converting electrical energy into heat through resistance heating elements, while the integrated circuit breaker provides electrical protection during operation. Designed for use ... https://www.partshnc.com/mrcool-10kw-universal-heat-kit-mhk10u