C-sec 4-way Ring Main Unit (RMU) 

A C-sec 4-way Ring Main Unit (RMU) is a compact, factory-assembled, medium-voltage switchgear used in electrical power distribution networks, manufactured by C-sec Technologies. The “4-way” configuration indicates it has four functional compartments or ways for cable connections, typically two for incoming/outgoing ring switches and two for outgoing transformer feeders.  Key Features Functionality & Application