XGN66‑12 Fixed‑type Indoor AC Metal‑Enclosed High‑Voltage Switchgear

XGN66‑12(Z) fixed‑type AC metal‑enclosed switchgear (hereinafter referred to as switchgear) is a new‑generation high‑voltage complete switchgear product.
It complies with national standard GB3906 "AC Metal‑enclosed Switchgear for Rated Voltages of 3.6kV‑40.5kV", power‑industry standard DL/T404, and international standard IEC60298.

Absorbing advanced overseas technologies, this cabinet features compact dimensions, its volume is merely 50% of ordinary high‑voltage switch cabinets. The vacuum circuit‑breaker provides high reliability and stable performance, and its five‑prevention mechanical interlock is simple‑structured yet dependable.

As indoor complete‑set equipment for 3‑phase AC 50Hz single‑busbar system (3.6kV /7.2kV /12kV), it undertakes receiving & distributing electric power, as well as circuit control, protection and monitoring functions. It can be widely deployed for power plants, substations, industrial‑mining facilities, high‑rise buildings, and can work together with ring‑main‑units in switching‑station projects.

Power plants & high‑voltage substations 
Industrial & mining enterprise power‑distribution rooms 
Commercial complex & high‑rise building power supply 
Municipal urban power‑grid distribution projects 
Can be combined with RMU ring‑main‑units for switching‑station solutions

1. Altitude: ≤ 1000 m above sea‑level
2. Ambient temperature: ‑25℃ ~ 40℃, 24‑h average temperature ≤ 35℃
3. Maximum allowable horizontal inclination: ≤ 3°
4. Earthquake intensity: ≤ Grade 8
5. Installation site: No severe vibration, impact, flammable or corrosive gas pollution.

1. High‑quality steel‑plate cabinet body The whole frame is welded from premium steel sheets, strong mechanical rigidity and long service‑life.
2. Bottom‑mounted VS1 vacuum circuit‑breaker Circuit‑breaker is installed in the lower compartment, convenient for installation, commissioning and maintenance. Equipped with dedicated pressure‑relief channel, to release internal arc energy and safeguard field operators.
3. Rotary‑type isolating disconnector Adopts advanced rotary‑structure disconnector, safe to complete earthing operation on live main busbar without cabinet de‑energization.
4. Full "Five‑Prevention" mechanical interlock Complete mandatory mechanical interlock devices, reliably achieve all five anti‑mis‑operation requirements.
5. Visible earthing system Stable and visible earthing switch structure, guarantees safe earthing protection during maintenance work.
6. Observation window design Observation window on cabinet door, allowing operators to visually inspect internal component working status.
7. Convenient cable‑wiring layout Inlet & outlet cable terminals are arranged at the cabinet bottom, simple for site wiring connection.