XGN66-12 12kV MV Switchgear|Compact & Reliable

Product Overview

The XGN66-12 is purpose-built for 3.6–12 kV medium-voltage distribution systems — the reliable core of your power distribution and protection.

An indoor three-phase AC 50 Hz complete set with rated current from 630 A to 3150 A, designed for single-busbar sectionalized systems, helping you safely receive and distribute energy while controlling and protecting your circuits.

Whether for power plants, substations, switching stations, industrial and mining enterprises, or high-rise buildings, the XGN66-12 delivers dependable performance — and can also be combined with ring-main units in urban distribution substations.

Key Advantages

• Space & cost savings: Only half the footprint of conventional switchgear, directly reducing your switchroom construction costs — ideal for land-scarce urban substations or indoor retrofit projects
• Flexible compatibility: Works with ZN21, VS1, ZN66, ZN28 and other mainstream vacuum circuit breakers, letting you standardize spare-parts inventory and lower procurement & maintenance costs
• Safety you can count on: Mandatory mechanical “five-prevention” interlock (prevents incorrect breaker operation, off-load disconnector switching, live earthing, closing to earth, and entry into live compartments) combined with a pressure-release channel builds a solid safety barrier for your operators
• Easy maintenance: Breaker compartment in the lower-middle section; rotary disconnector allows safe inspection while the main busbar stays energized, cutting downtime and reducing your outage losses
• Long-term stability: 20,000 mechanical operations and 50 short-circuit breaking operations mean fewer maintenance intervals and lower ongoing operational labor costs

Applications & Functions

As the core complete set in your medium-voltage distribution system, the XGN66-12 handles power reception and distribution, circuit control and protection, and real-time operational status monitoring.

Suitable for:

• Power plant auxiliary power distribution systems
• Medium-voltage distribution in substations and switching stations
• Power supply and distribution for industrial and mining enterprises
• High-rise buildings and commercial complex distribution
• Combination with ring-main units in urban distribution substations

Standards & Construction

This switchgear complies with IEC 60298, GB 3906, DL/T 402, and DL/T 404 international and domestic standards, manufactured by Hebei Wanbo Electric with traceable quality.

The enclosure is welded from high-quality angle steel for a robust, elegant structure. The breaker compartment sits in the lower-middle section, standard-equipped with the ZN63A (VS1-12) circuit breaker and fitted with a pressure-release channel to protect your maintenance personnel.

A rotary disconnector allows safe entry into the breaker compartment while the main busbar remains energized. An observation window on the door lets you monitor internal component status at any time. The operating mechanism uses the same JSXGN interlock as the XGN2-12 cabinet — simple and reliable.

Protection degree:

• Enclosure: IP4X
• Between compartments and with breaker door open: IP2X

A dependable earthing system and convenient maintenance round out the design.

Technical Specifications

Key technical specifications:

• Rated voltage: 3.6 / 7.2 / 12 kV
• Rated frequency: 50 Hz
• Rated current: 630 / 1250 / 1600 / 2000 / 2500 / 3150 A
• Rated short-circuit breaking current: 16 / 20 / 25 / 31.5 / 40 / 50 kA
• Rated short-time withstand current (4 s): 16 / 20 / 25 / 31.5 / 40 / 50 kA
• Rated peak withstand current: 40 / 50 / 63 / 80 / 100 / 125 kA
• Rated short-circuit making current (peak): 40 / 50 / 63 / 80 / 100 / 125 kA
• 1 min power-frequency withstand voltage: 24 / 32 / 42 kV
• Lightning impulse withstand voltage: 40 / 60 / 75 kV
• Mechanical endurance: 20,000 operations
• Short-circuit breaking operations: 50

Service conditions:

• Ambient temperature: -10°C to +40°C (daily average ≤+35°C)
• Relative humidity: daily average ≤95%, monthly average ≤90%
• Altitude: ≤1000 m
• Seismic intensity: ≤8 degrees
• Installation: indoors, free from fire, explosion hazards, serious contamination, corrosive gases, and strong vibration
• Installation inclination: ≤5°

Customization & Ordering

Hebei Wanbo Electric supports customized delivery based on your actual requirements — personalized configuration according to your single-line diagram, cabinet layout specifications, and designated component brands. Every unit passes rigorous testing before delivery, backed by comprehensive after-sales technical support and spare parts supply.

When ordering, please provide:

• Single-line diagram and cabinet layout drawing
• Secondary wiring schematic and terminal arrangement (per manufacturer standard if not provided)
• Component list with models, specifications, and quantities
• Main and branch busbar material and specification (per manufacturer standard if not provided)
• Busbar bridge span if required; horizontal busbar must be specified in the contract
• Special ambient conditions, accessories, and spare-part requirements stated at time of order