XGN Fixed AC Metal Enclosed Switchgear
XGN15-12 Box Type Fixed AC Metal Enclosed Switchgear uses SF6 switch as main switch and the whole cabinet is air insulated, which is applied in distribution automation, compact and extensible metal sealed switch equipment.
The switchgear holds features of simple structure, flexible operation, reliable inter-lock and convenient installation and so on. It can provide satisfied technology solution for various applied places according to different users’ demand.
XGN15-12 box-type fixed AC metal-enclosed switchgear uses an SF6 load break switch as its main switch inside an air-insulated cabinet — a compact, extensible, metal-sealed unit built for distribution automation at 12 kV. Simple structure, flexible operation, reliable interlocks, and straightforward installation make it the practical answer for ring network positions and transformer protection points where drawout maintainability is not the priority.
We configure XGN15-12 units to their position in your network — cable arrangements, protection fusing, automation interfaces, and extensible bus connections assembled and tested in our plant. Fifteen years and 4,000+ projects of fabrication practice stand behind the enclosures, with CNC punching, bending, and welding in-house.
Model Description
Technical Parameters
| Rated voltage | Unit | 12KV | 24KV | |||
|---|---|---|---|---|---|---|
| Item | / | Load switch cabinet | Combined electrical cabinet | Circuit breaker cabinet | 20KVSF6 Ring switch equipment | |
| Rated frequency | HZ | 50/60 | 50/60 | 50/60 | 50/60 | |
| Rated current | A | / | ||||
| Main busbar | A | 630 | 630 | 630 | 630 | |
| Branch busbar | A | 630 | 125① | 630 | 630/≤100② | |
| Rated insulation level | KV | / | ||||
| Power frequency withstand voltage | Phase-to-phase and phase-to-ground | KV | 42 | 42 | 42 | 65 |
| Gap between breaks | KV | 48 | 48 | 48 | / | |
| Break control and auxiliary circuit | KV | 2 | 2 | 2 | / | |
| Lightning impulse withstand voltage | Phase-to-phase and phase-to-ground | KV | 75 | 75 | 75 | 85 |
| Gap between breaks | KV | 85 | 85 | 85 | / | |
| Rated short-time withstand current | KA | / | ||||
| Main circuit | KA | 20/3s | – | 25/2s | / | |
| Grounding circuit | KA | 20/25 | – | 25/2s | / | |
| Rated peak withstand current | KA | 50 | – | 63 | / | |
| Rated short-circuit making current | KA | 50 | 80 | 63 | 50 | |
| Rated short-circuit breaking current | KA | – | 31.5 | 25 | 31.5 | |
| Rated transfer current | A | – | 1750 | – | 870 | |
| Rated active load breaking current | A | 630 | – | – | 630 | |
| Rated closed loop breaking current | A | 630 | – | 630 | / | |
| Rated cable charging breaking cable | A | 10 | – | 15 | 25 | |
| Protection degree | / | IP3X | IP3X | IP3X | / | |
| Mechanical life | Load switch | times | 5000 | 5000 | 10000 | 3000 |
| Grounding switch | times | 2000 | 2000 | 2000 | 2000 | |
Feature of Fixed AC Metal Enclosed Switchgear
- Modular design. Each unit module can be combined and extended arbitrarily, which is an easy to scheme combination, with a wide applicable range.
- The armored structure is used for the cabinet. And each compartment is separated from the other one by metal partition board.
- The corrosion resistant metal is used for the operating mechanism, and bearings of rotating parts are all self-lubricating bearings. The product will not be affected by the environment, thus exempting it from regular maintenance.
- In order to adapt to the power grid automation and improve the reliability of power distribution, the electric drive mechanism, control terminal unit of power distribution network and other equipment can be added. Thus, it possesses telemetering, remote signaling, and remote-control systems.
- The cabinet is compact in design, using three- a three-position rotary load switch, which effectively reduces the number of components and parts, and realizes the five-preventions interlocking.
- The simulated single-line diagram of the primary circuit and analog display can display the internal conditions of the switch so that the operation can be simple, correct, and safe.
Fixed AC Metal Enclosed Switchgear Structure
Key Specifications & Options
The configuration below reflects the options we build to order for XGN15-12 fixed AC metal-enclosed switchgear. Every parameter can be adjusted to match your drawings and site conditions — send us your requirements and our engineers will confirm what applies to your project.
| Parameter | Options / Typical Range |
|---|---|
| Rated voltage | 12 kV class distribution systems |
| Main switch | SF6 load break switch in a sealed three-position unit |
| Insulation | Air-insulated cabinet around the sealed switch unit |
| Construction | Box-type fixed metal-enclosed; compact footprint, extensible into multi-bay units |
| Configuration options | Cable in/out arrangements, switch-fuse transformer protection, distribution automation interfaces |
| Interlocking | Reliable mechanical interlocks between switching and earthing positions |
| Applicable standards | GB 3906 corresponding to IEC 62271-200; load break switch to GB 3804 |
| Typical applications | Ring main networks, cable distribution points, compact substation transformer protection, distribution automation |
Frequently Asked Questions
Fixed metal-enclosed or removable metal-clad — which should I choose?
Fixed XGN15-12 units are compact and economical for ring and terminal positions where the switching element is a load switch, not a fault-rated drawout breaker; removable metal-clad panels like KYN28 belong where breaker maintenance continuity justifies their cost. Many networks use both — metal-clad at the substation, fixed units out on the ring.
What role does the SF6 load switch play?
It is the working switch of the unit: a three-position device that closes, opens, and earths the circuit within its sealed volume, switching load currents and cable charging currents while switch-fuse combinations or breakers handle transformer protection duty upstream in the scheme.
Is SF6 still the right choice today?
In this duty it remains a mature, sealed-unit solution with small gas volume per position, while solid-insulated and dry-air alternatives are advancing fast for SF6-sensitive projects. We offer both routes — see our solid-insulated ring cabinet — and select per your environmental requirements.
How does GB 3906 relate to IEC 62271-200?
GB 3906 is the national standard for AC metal-enclosed switchgear above 1 kV and corresponds to IEC 62271-200. The load break switch itself follows GB 3804. We design and document to these standards and reference the IEC framework for export projects.
Related Guides
- Metal Enclosed Switchgear: A Comprehensive Guide — the construction family this unit belongs to
- Medium-Voltage-Switchgear Guide: Functions, Components, and Selection Inputs — MV selection framework
- Ring Main Unit (RMU) Guide: Functions, Components, and Selection Inputs — the ring main unit role this cabinet serves
- Removable AC Metal Clad Switchgear (KYN28-24) — the drawout metal-clad counterpart
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