The KYN28 type armored withdrawable indoor AC metal-enclosed switchgear (hereinafter referred to as the switchgear) is a three-phase AC 50Hz indoor complete distribution device used for receiving and distributing 3-12kV network electrical energy, as well as controlling, protecting, and monitoring circuits. This product allows various types of microcomputer-based integrated relay protection devices to be installed on the relay panel, enabling intelligent control of the system. It features remote control, remote measurement, remote signaling, and remote adjustment functions, and controls the on-site network through a CAN bus with a communication interface. The switchgear includes protection functions to prevent incorrect breaker operation, prevent pulling or pushing the truck with load, prevent closing the grounding switch while under load, prevent power supply through the grounding switch in the grounded position, and prevent accidental entry into live compartments—collectively known as the "Five Prevention" functions. The cabinet can be equipped with VSI (i.e., ZN63) or ZN12V vacuum circuit breakers, as well as imported VD4 vacuum circuit breakers and VC series vacuum contactors.

※: The rated current of the branch bus can reach 3150A in air cooling

※ ※: The current transformer according to the capacity should be considered separately

※ ※ ※: The rated short-term withstand current is 31.5kA and below, and the cabinet width is 800mm when the rated current of branch bus is 1250A and below; The rated short-term withstand current is 40kA and above, the cabinet width is 1000mm when the rated current of branch bus is 1250A or above, and the cabinet depth is determined according to the project conditions.