The primary system diagram and On/Off indicators are integrated onto the panel, providing clear sequence and status indications for operations. The circuit breaker features a reclosing function.
The three-position switch adopts a dual-operating-shaft design to guarantee the independence of the earth switch and prevent mis-operation.

This RMU adopts a highly reliable CT self-powered protection design principle. When faults such as short circuits, overcurrents, or earth faults occur within the protected zone, the secondary current generated by the current transformer increases. This causes the corresponding fuse within the protection device to blow. The CT power-supplying circuit, connected in parallel with the fuse, is activated, generating a trip pulse that drives the circuit breaker mechanism to open.

The cable testing device is located in front of the switchgear, enabling simple and convenient testing. The CTs are integrated on the outgoing side of the bushings, with the cable installation height exceeding 650mm.