CJF series modular manual changeover switch (manual transfer switch, MTS) is an unique solution applied in the circuit of AC50/60Hz, rated current up to 63A, rated voltage 230VAC (1P/2P) or 400VAC (2P, 3P and 4P) for the control between two power supplier with three switchgear positions I-0-II. Modular switch is a three-block switch, control circuit current supply switch, the middle is neutral, up and down for conversion circuit operation . Its can switch on, load and break the circuit under normal conditions, using as switch disconnectors.When the lever is turned to Switchgear I, the power supply I connects and the power supply II breaks. When the lever is turned to Switchgear II, the power supply I breaks and the power supply II connects. When the lever is turned to Switchgear 0, the both power supplies break.