Based on the installation method of the load switch, ring main units can be classified into side-mounted types and front-mounted types.

The side-mount ring main unit consists of electrical components, the cabinet body, and an interlocking mechanism.

The primary electrical components include: FN12-12 load switches with side-mounted operating mechanisms; ISARC-type load switches manufactured by VEI; LBS- or VLBS-type load switches manufactured by LKE; current transformers; voltage transformers; and high-voltage live-line indicators. All components are securely mounted onto the cabinet body.

The cabinet body of the side-mount ring main unit adopts a fully assembled structure, comprising a frame, top panel, door panel, and side enclosure panels, forming a fully enclosed structure. The frame, top cover, front panel, and side enclosure panels are all fabricated from bent steel plates.

An interlocking device is installed among the load switch, earthing switch, and front door panel within the ring main unit. Their operational relationships are as follows:

The front-mounted ring main unit consists of electrical components, the cabinet body, and an interlocking mechanism.

The primary electrical components include the FN12-12 type load switch without side-mounted operating mechanisms, the ISARC type load switch manufactured by VEI Company, the LBS or VLS type load switches manufactured by LK Company, current transformers, voltage transformers, and high-voltage live-line indicators.

The cabinet body of the front-mounted ring main unit adopts a fully assembled structure, comprising a frame, top plate, door panels, side enclosure panels, and an operating mechanism.

The interlocking mechanism coordinates safety operations specifically for the front-mounted configuration.

Busbars may be manufactured from copper or aluminum.

Color coding is applied to busbars to ensure phase identification and safety.