AC Metal-Enclosed Ring Main Switchgear/Gas Switchgear

The AC metal-enclosed ring main switchgear (referred to as“ring main unit”or“switchgear”) is designed for use in power distribution systems in industrial and mining enterprises, residential communities, high-rise buildings, school campuses, and similar settings. It operates as an indoor AC three-phase 12kV, 50Hz power supply unit for ring networks and terminal power distribution. This equipment is capable of opening and closing rated load currents, transformer no-load currents, and certain lengths of overhead or cable line capacitive currents. Additionally, the load switch-fuse combination unit can interrupt the rated short-circuit current in a single operation. The switchgear provides protection for power distribution systems, enables energy distribution and control, and is equipped with a comprehensive “five-prevention” interlocking mechanism for enhanced safety.

Structural Features

The ring main unit/Gas Switchgear’s structure is constructed from partially welded 8MF steel, assembled with bolts for modularity and robustness. It typically incorporates the FZN25-12 two-position vacuum load switch or the FN7-12 gas load break switch. Combined electrical appliances integrate a vacuum load switch with a fuse equipped with a striker. Flexible configuration options allow for the installation of current transformers (CT), potential transformers (PT), or ZnO arresters as needed. For cable entry, the cabinet base includes a removable cover plate for convenient installation, and an optional bus channel can be added for overhead cable entry based on user requirements.

Normal Operating Conditions

1. Temperature:
   • Maximum ambient air temperature: +40°C.
   • Minimum ambient air temperature: -25°C.
   • The average temperature over 24 hours should not exceed +35°C.
2. Altitude:
   • Standard usage: ≤1000m above sea level.
   • Special conditions: ≤2000m above sea level.
3. Atmospheric Conditions:
   • Surrounding air should be free from significant pollution by dust, smoke, corrosive or flammable gases, steam, or salt spray.
4. Humidity:
   • Maximum 24-hour average relative humidity: ≤95%.
   • Maximum 24-hour average water vapor pressure: ≤2.2 kPa.
   • Maximum monthly average relative humidity: ≤90%.
   • Maximum monthly average water vapor pressure: ≤1.8 kPa.
5. Installation:
   • The inclination of the equipment from the vertical plane should not exceed 5°.
   • The equipment must be installed in locations free from severe vibration and mechanical impact.

Professional Gas Switchgear supplier and manufacturer

1. Zhejiang GONGSHUN Electrical Co.,Ltd (electric-cn.com), Our company was founded in the late 1990s, specializing in the production of inflatable cabinets, SF6 inflatable cabinets, and various high and low voltage complete sets of electrical equipment. It has multiple subsidiaries under its jurisdiction, including high-voltage load switch branch, high-voltage circuit breaker branch, high-voltage fuse branch, and technology development branch.Our technical expertise, comprehensive product portfolio and long-term rich experience are helping many customers in need to solve their power problems. We’re happy to help at any time.  Whether you need application product advice or technical assistance, our global service team is committed to providing you with the right support. For more technical information about medium voltage earthing switch, feel free to contact us, send an email to gongshun@electric-cn.com 
2. Our company specializes in producing 12KV-40.5KV series high-voltage electrical products: FZN58, FLN48, FLN36, FZRN25, FZN21, FN18, ZFN16, FN12, FN8, FN7, FN5, XRNT, XRNP, VS1, ZN28, ZW8, ZW32, JN15, GN19, GN22, GN24, GN30, CLXGN15-12, HXGN □ -12, DXG-12 (L), DFW □ -12 high-voltage cable branch box, CLXGN □ -12 (SF6) series inflatable cabinet 12KV and 35KV cable accessories, etc; CLVXP-12 indoor AC high voltage fixed switchgear, CL-SIS-12 compact solid insulated ring main unit, professional assembly Schneider SC6 (SF6) series load switchgear, ABB produced SFG (SF6) series load switchgear and other series products; Distribution and agency of high-voltage load switches and inflatable cabinets produced by Schneider Electric and ABB; Siemens produces the 3AJ1 series of indoor medium voltage vacuum circuit breakers and other related products. The company has a complete range of products and has been operating safely on domestic and international power grids for a long time, receiving unanimous praise from both new and old users. Among them, multiple products such as FZRN25, FN12, FLN36-12, XRNT-12 have been exported to various countries and regions in East Asia, South Asia, Southeast Asia, Africa, and the United States.