With the continuous advancement of society, the demand for reliable power supply has grown significantly. In many applications, dual power sources are deployed to guarantee power supply continuity, necessitating a device that can ensure seamless switching between the two sources. KFP3 series automatic transfer switch has been specifically developed to address this need. KFP3 is ideal for critical facilities requiring uninterrupted power supply, including fire protection systems, postal and telecommunications, hospitals, hotels, light rail transit, high-rise buildings, industrial production lines, and television stations. KFQ2 series automatic transfer switch consists of two three-pole or four-pole molded case circuit breakers with accessories (auxiliary and alarm contacts), a mechanical interlock transmission mechanism, an intelligent controller, and other components. Two structural configurations are available: integrated type and split type. In the integrated version, the controller and operating mechanism are mounted together on a single base. In the split version, the controller is mounted on the cabinet panel, while the operating mechanism is installed on the base by the user. The controller and operating mechanism are connected by a signal cable approximately 2m in length.