The control and protection switch adopts modular single product structure, which integrates the main functions of traditional circuit breaker (fuse), contactor, overload (or over-current, off-phase) protection relay, starter, isolator, etc. It is mainly used for AC 50Hz (60Hz), rated voltage to 690V, rated current from 0.8A to 630A, etc. Circuits with adjustable operating current from 0.8A to 630A are connected, loaded, and disconnected under normal conditions (including prescribed overload conditions), and can be turned on, loaded, and disconnected under prescribed abnormal conditions (such as short circuits). The functions are as follows:

    A. has long distance automatic control and local direct manpower control function.

    B. has panel indication and electromechanical signal alarm function.

    C. has over voltage and under voltage protection function.

    D. has the function of phase failure and phase protection.

    E. has the characteristics of time current protection for coordination.

    F. has inverse time limit, timing limit and instantaneous three phase protection characteristics.

    The control and protection of various motor loads and distribution loads can be realized by selecting functional modules or accessories according to the needs.

    In terms of its structure and function, the series of control and protection switches are no longer single products such as contactors, circuit breakers, or thermal relays, but a set of control and protection systems. Its appearance fundamentally solves the problems of unreasonable control and protection coordination caused by unreasonable selection of traditional discrete components (usually circuit breakers or fuses + contactors + overload relays), especially the protection when electrical products with different examination standards are combined. The incongruity between characteristic and control characteristic greatly improves the operation reliability and continuous operation performance of control and protection system.

    Control and protection switches are the best substitutes for circuit breakers, contactors, thermal relays, fuses and other low-voltage electrical appliances.