A control and protection device of a low-voltage electrical apparatus, comprising: a pedestal, the pedestal having a base and a housing, the pedestal including therein: a moving contact, a static contact, and a current conductor connecting to a main circuit; a control electromagnet and an operation mechanism, the control electromagnet and the operation mechanism controlling the moving contact and the static contact to close or open in response to a control signal, the control electromagnet and the operation mechanism maintaining the close or open statuses of the moving contact and the static contact; a manual operation knob, providing the control signal for controlling the close or open of the moving contact and the static contact; a control contact connected to the manual operation knob; a current sensor, detecting a current that flows through the current conductor connecting to the main circuit and generating a sensing signal; a control and protection module, the control and protection module being pluggable and replaceable, the control and protection module being plugged in the pedestal, the control and protection module including therein: a signal processing unit, controlling the status of the control electromagnet by electrical circuits in response to the sensing signal; a tripping device, controlling operations of the operation mechanism through mechanical connection in response to the signal processing unit. a pedestal, the pedestal having a base and a housing, the pedestal including therein: a moving contact, a static contact, and a current conductor connecting to a main circuit; a control electromagnet and an operation mechanism, the control electromagnet and the operation mechanism controlling the moving contact and the static contact to close or open in response to a control signal, the control electromagnet and the operation mechanism maintaining the close or open statuses of the moving contact and the static contact; a manual operation knob, providing the control signal for controlling the close or open of the moving contact and the static contact; a control contact connected to the manual operation knob; a current sensor, detecting a current that flows through the current conductor connecting to the main circuit and generating a sensing signal; a moving contact, a static contact, and a current conductor connecting to a main circuit; a control electromagnet and an operation mechanism, the control electromagnet and the operation mechanism controlling the moving contact and the static contact to close or open in response to a control signal, the control electromagnet and the operation mechanism maintaining the close or open statuses of the moving contact and the static contact; a manual operation knob, providing the control signal for controlling the close or open of the moving contact and the static contact; a control contact connected to the manual operation knob; a current sensor, detecting a current that flows through the current conductor connecting to the main circuit and generating a sensing signal; a control and protection module, the control and protection module being pluggable and replaceable, the control and protection module being plugged in the pedestal, the control and protection module including therein: a signal processing unit, controlling the status of the control electromagnet by electrical circuits in response to the sensing signal; a tripping device, controlling operations of the operation mechanism through mechanical connection in response to the signal processing unit. a signal processing unit, controlling the status of the control electromagnet by electrical circuits in response to the sensing signal; a tripping device, controlling operations of the operation mechanism through mechanical connection in response to the signal processing unit.