GMX65‑12(CVF) Solid Insulated Ring Main Unit RMU,

GMX65‑12(CVF) solid‑insulated ring main unit (RMU) is a new generation of environmentally‑friendly solid‑insulated RMU. It mainly consists of three functional units: V unit (circuit breaker unit), C unit (load switch unit), and F unit (combination device unit). Each unit can be used independently or freely expanded.

Its structure is divided into the intelligent control instrument compartment, operating mechanism compartment, and primary part. The instrument compartment can be equipped with a microcomputer protection device (controller). The mechanism is a dedicated spring operating mechanism.

The primary part adopts the APG automatic gel process, completely encapsulating the disconnector and arc extinguishing chamber in epoxy resin, with dedicated axial connectors connecting to the busbar. The arc extinguishing chamber of the switch uses a dedicated copper‑chromium contact material, R‑type axial magnetic field contacts, and a complete one‑time brazing and exhaust process. Compared with previous arc extinguishing chambers (copper‑tungsten contact material, cup‑shaped axial magnetic field contact structure, and incomplete one‑time brazing and exhaust process), this arc extinguishing chamber shows significant improvements in short‑circuit current breaking capacity, stability, electrical life, temperature rise, and insulation level.

The operating mechanism adopts a spring mechanism integrated with the switch, meaning the disconnector and main switch spring mechanisms are integrated, allowing convenient interlocking. The mechanism has fewer parts, reduces unnecessary transmission links, offers high reliability, and can be equipped with electric operation according to user requirements.

1. Three Modular Functional Units V (circuit breaker), C (load switch), F (combination device) units. Each unit operates independently and supports free expansion & combination to match various ring‑network topologies.
2. APG Fully‑Encapsulated Solid Insulation Primary conductive parts including disconnector, arc chamber and busbar connectors are fully encapsulated in epoxy resin via APG automatic gel process. Achieves fully‑insulated & fully‑sealed performance, eliminates external environmental influence.
3. Advanced Arc‑Extinguishing Chamber Copper‑chromium contact material R‑type axial magnetic field contact structure complete one‑time brazing & exhaust process. Delivers superior short‑circuit breaking capacity, stability, electrical life, temperature‑rise control and insulation level compared with conventional designs.
4. Integrated Spring Operating Mechanism Disconnector and main switch spring mechanism are integrated into one unit. Fewer transmission parts, convenient mechanical interlocking, high operational reliability. Manual operation as standard; electric operation available as option.
5. Three‑Position Over‑Center Spring Mechanism Over‑center spring design enables reliable make‑break of load current. Supports both manual and electric operation modes.
6. Intelligent Control Ready Instrument compartment accepts microcomputer protection controller, supporting remote monitoring, fault recording and automation integration for smart grid applications.
7. SF6‑Free Environmentally‑Friendly Design No SF6 greenhouse gas. Solid epoxy insulation replaces gas insulation, fully compliant with global environmental‑protection directives, zero gas leakage risk.