The invention discloses a control and protection device of a low-voltage apparatus. The control and protection device of the low-voltage apparatus comprises a base and a control and protection module which is arranged on the base in a pluggable mode and interchangeable. The base comprises a base seat and a housing, and the inside of the base is provided with a moving contact, a fixed contact and a main loop current conductor; a control electromagnet and an operation mechanism which control and maintain the contact and the separation of the fixed contact and the moving contact according to control signals; a manual operation knob which provides the control signals of controlling the contact and the separation of the fixed contact and the moving contact; a control contact which is connected to the manual operation knob; and a current sensor which is used for detecting the current flowing through the main loop current conductor to generate sensing signals. The inside of the control and protection module is provided with a signal processing unit which controls the status of the control electromagnet through an electric circuit according to the sensing signals; and a tripping device which responds to the signal processing unit to control the actions of the operation mechanism through a mechanical connection mode.