The invention provides a power-dissipation-free and energy-saving type start protector of a
single phase AC motor and belongs to the technical field of
refrigeration compressors. The power-dissipation-free and energy-saving type start protector comprises a shell, a shell cover, an overload protector, a power-dissipation-free
starter and an external terminal mechanism. The shell is provided with an overload protector seat, a power-dissipation-free
starter accommodation cavity, an external terminal mechanism cavity and a start controller
accommodation cavity. The shell cover is provided with a first three-terminal jack and a second three-terminal jack. The overload protector is arranged in an overload protector
accommodation cavity. The power-dissipation-free
starter comprises a power-dissipation-free starter body and a start controller. The external terminal mechanism is matched with the external terminal mechanism cavity. The start protector is characterized in that the external terminal mechanism cavity comprises a
first insertion cavity, a second
insertion cavity and a third
insertion cavity, the second
insertion cavity is formed in the left side of the shell, and the bottom wall of the second insertion cavity is provided with a second shell insertion groove; the
first insertion cavity and the third insertion cavity are formed in the right side of the shell, a first shell insertion groove is formed in the bottom wall of the
first insertion cavity, and a third shell insertion groove is formed in the bottom wall of the third insertion cavity; the external terminal mechanism comprises a first insertion piece and a second insertion piece, the first insertion piece is matched with the second shell insertion groove in an inserted mode, and the second insertion piece is matched with the first shell insertion groove in an inserted mode.