XGN66-12 Fixed Closed Switchgear
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What Is the XGN66-12 Fixed Closed Switchgear?
The XGN66-12 is an indoor box-type fixed metal-enclosed switchgear designed for medium voltage power distribution systems. It provides a complete solution for receiving, distributing, controlling, and protecting electrical energy in a single compact enclosure.
The XGN66-12 fixed closed switchgear is a new-generation high-voltage electrical product developed for 3.6kV, 7.2kV, and 12kV three-phase AC 50Hz single busbar systems. It absorbs advanced international technology to address the high accident rates and large volumes of conventional switchgear. The result is a compact, reliable, and safe indoor switchgear that occupies only about 50% of the volume of traditional equipment while delivering superior performance.
The switchgear integrates a vacuum circuit breaker (ZN63-12 / VS1-12), rotary disconnecting switches (GN30-12 and GN19-12C), earthing switches, current and voltage transformers, and microprocessor-based protection relays into a single metal-enclosed frame.
Key Features of XGN66-12 Box-Type Fixed Metal-Enclosed Switchgear
The XGN66-12 switchgear combines compact design, reliable interlocking, and vacuum interrupter technology to deliver safe and efficient medium voltage distribution.
Compact Box-Type Enclosure
Only 50% the volume of conventional switchgear. Smaller footprint and lower height make it ideal for space-constrained urban substations, indoor distribution rooms, and prefabricated substation integration.
Assembled Structure, No Welding
The cubicle uses an assembled structure with profiles and G-profiles connected by fasteners - no welding. CNC punching and bending ensure high precision in form, position, and dimension for flexible configuration.
Reliable Five-Proof Interlocking
Mandatory mechanical interlocks between the circuit breaker, disconnecting switch, earthing switch, and panel door prevent: breaker mis-operation, load-current switching, earthing live busbars, closing with earthing engaged, and entering energized compartments.
Vacuum Circuit Breaker Technology
The ZN63-12 (VS1-12) vacuum circuit breaker features sealed vacuum interrupters with no SF6 gas or oil. Low maintenance, long electrical life (50 rated short-circuit breaking operations), and environmentally friendly operation.
Advanced Rotary Disconnecting Switches
The rear upper part uses GN30-12 rotary disconnect switches and the lower part uses GN19-12C disconnect switches, enabling safe maintenance access to the circuit breaker compartment under live main busbar conditions.
Comprehensive Protection & Monitoring
Supports overcurrent, short-circuit, earth fault, undervoltage, and overvoltage protection through integrated microprocessor-based relays. Operators can isolate faulty lines and monitor load conditions without exposing themselves to live parts.
Front-Access Cable Termination
Incoming and outgoing cables connect at the front lower part of the cabinet, simplifying installation, commissioning, and cable maintenance. Panel-to-panel busbar connections are straightforward and fast.
Observation Window & Pressure Relief
Observation windows on the door allow clear visual inspection of internal component working states. The circuit breaker compartment is equipped with a pressure relief channel to ensure personal safety during internal arc faults
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XGN66-12 Switchgear Structure and Internal Layout
The XGN66-12 fixed closed switchgear adopts a box-type metal-enclosed structure divided into four compartments for safety isolation and maintenance access.
The cubicle consists of profiles and G-profiles assembled by several connection pieces. Parts are processed by CNC punching machines, CNC bending machines, and sophisticated CNC machining centers, ensuring high precision of form, position, and dimension. This manufacturing approach enables flexible combination of different schemes to meet diverse customer requirements.
Busbar Compartment
Houses the main busbar and branch busbar connections. Located in the upper rear section, isolated from other compartments for arc fault containment.
Circuit Breaker Compartment
Located in the middle (lower part) of the cabinet. Houses the ZN63-12 vacuum circuit breaker. Equipped with a pressure relief channel for operator safety during fault conditions.
Metering Compartment
Contains current transformers, voltage transformers, and measuring instruments. Isolated design allows safe meter calibration and replacement without busbar de-energization.
Cable Compartment
Front-access cable termination area at the lower front of the cabinet. Supports incoming and outgoing cable connections with earthing switch for safe maintenance.
Model Designation: XGN66-12
- X - Box-type enclosed switchgear (Xiangui / box-type)
- G - Fixed mounting (Guding / fixed)
- N - Indoor use (Nei / indoor)
- 66 - Design sequence number
- 12 - Rated voltage 12kV
XGN66-12 Switchgear Technical Specifications
Complete technical parameters for the XGN66-12 fixed closed switchgear and its integrated ZN63-12 vacuum circuit breaker. All values comply with GB3906, DL/T404, and IEC62271-200 standards.
Switchgear Main Technical Parameters
| Parameter | Unit | Value |
|---|---|---|
| Rated voltage | kV | 3.6 / 7.2 / 12 |
| Rated frequency | Hz | 50 |
| Rated main busbar current | A | 630, 1250, 1600, 2000, 2500, 3150 |
| Rated branch busbar current | A | 630, 1250, 1600, 2000, 2500, 3150 |
| Rated short-time withstand current (4s) | kA | 20, 25, 31.5, 40 |
| Rated peak withstand current | kA | 50, 63, 80, 100 |
| Rated short-circuit breaking current | kA | 20, 25, 31.5, 40 |
| Rated short-circuit making current (peak) | kA | 50, 63, 80, 100 |
| 1-min power frequency withstand voltage (phase-to-phase, phase-to-ground) | kV | 25, 30, 42 |
| 1-min power frequency withstand voltage (breaker gap) | kV | 27, 34, 48 |
| Rated lightning impulse withstand voltage (phase-to-phase, phase-to-ground) | kV | 40, 60, 75 |
| Rated lightning impulse withstand voltage (breaker gap) | kV | 46, 70, 85 |
| Protection class (enclosure) | - | IP2X / IP3X / IP4X |
| Installation type | - | Fixed mounting, indoor |
| Dimensions (W x D x H) | mm | 900 x 1000 x 2300 (standard) |
| Panel width options | mm | 800 / 1000 |
| Applicable standards | - | GB3906, DL/T404, IEC62271-200 |
ZN63-12 Vacuum Circuit Breaker Parameters
| Parameter | Unit | Value |
|---|---|---|
| Rated voltage | kV | 12 |
| Rated current | A | 630, 1250 |
| Rated short-circuit breaking current | kA | 20, 25, 31.5 |
| Rated short-circuit making current (peak) | kA | 50, 63, 80 |
| Rated short-time withstand current (4s) | kA | 20, 25, 31.5 |
| Rated peak withstand current | kA | 50, 63, 80 |
| Mechanical endurance | operations | ≥ 10,000 |
| Rated short-circuit breaking times | times | 50 |
| Rated operating sequence | - | O-0.3s-CO-180s-CO |
| Contact stroke | mm | 11 ± 1 |
| Contact over-travel | mm | 4 ± 0.5 |
| Interphase center distance | mm | 210 |
| Opening speed | m/s | 1.2 ± 0.2 |
| Closing speed | m/s | 0.6 ± 0.2 |
| Opening time | ms | ≤ 60 |
| Closing time | ms | ≤ 75 |
| Three-phase opening synchronization | ms | ≤ 2 |
| Loop resistance | µΩ | ≤ 45 |
Operating Environment Conditions
| Condition | Requirement |
|---|---|
| Ambient temperature | -25°C to +40°C (24h average ≤ +35°C) |
| Relative humidity | Daily average ≤ 95%, monthly average ≤ 90% |
| Altitude | ≤ 1000m (consult manufacturer for higher altitudes) |
| Horizontal tilt | ≤ 3 degrees |
| Seismic intensity | ≤ 8 degrees |
| Environmental restrictions | No fire, explosion, heavy pollution, chemical corrosion, or severe vibration/shock |
Applications of XGN66-12 Indoor Fixed-Type Switchgear
The XGN66-12 switchgear is widely used in power plants, substations, industrial facilities, and commercial buildings for receiving and distributing electrical energy with control, protection, and monitoring functions.
- Power Plants：Generation facility auxiliary power distribution
- Substations：Primary and secondary distribution substations
- Industrial & Mining：Factory and mine power receiving/distribution
- High-Rise Buildings：Commercial building MV switchboards
- Urban Distribution：City grid receiving and distribution
- Rural Grids：Rural power network reform projects
- Ring Network：Combined with ring main units in switch stations
- Public Facilities：Schools, hospitals, infrastructure projects
- Prefabricated Substations：Compact substation integration
The XGN66-12 switchgear can be combined directly with ring main units, making it an excellent candidate for secondary substations and switch stations. This interoperability means you are not locked into a single vendor's ecosystem - you get XGN66-12 quality where you need it, while keeping the flexibility to expand your network with standard ring configurations.
Why Choose XGN66-12 Fixed Metal-Enclosed Switchgear?
A side-by-side comparison of the XGN66-12 box-type fixed switchgear versus conventional withdrawable switchgear.
| Comparison | XGN66-12 Fixed Switchgear | Conventional Withdrawable Switchgear |
|---|---|---|
| Volume | ~50% of conventional (compact) | Standard (larger footprint) |
| Mounting type | Fixed, no withdrawable carriage | Withdrawable truck |
| Circuit breaker | ZN63-12 vacuum CB (sealed interrupter) | ZN63-12 or oil/SF6 CB |
| Cost | Lower (simpler structure) | Higher (complex mechanism) |
| Maintenance | Simple, front-access | Requires truck withdrawal |
| Interlock | Five-proof mechanical interlock | Standard interlock |
| Best for | Fixed-load substations, distribution | Frequent CB replacement applications |
Get Your XGN66-12 Switchgear Quote Today
Fast response within 24 hours. Free technical consultation. Custom configurations available for 630A–3150A rated current and 20kA–40kA short-circuit capacity.
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FAQ
What is the rated voltage of XGN66-12 switchgear?
The XGN66-12 fixed closed switchgear is rated for 3.6kV, 7.2kV, and 12kV three-phase AC 50Hz systems, making it suitable for medium voltage distribution applications. It handles single busbar segmentation with ease across this voltage range.
What standards does XGN66-12 switchgear comply with?
XGN66-12 switchgear complies with national standard GB3906 ("3–35kV AC Metal-Enclosed Switchgear"), DL/T404 ("Technical Conditions for Ordering Indoor AC High Voltage Switchgear"), and international standard IEC62271-200 ("AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to and Including 52kV").
What are the dimensions of XGN66-12 switchgear?
The standard XGN66-12 switchgear panel dimensions are approximately 900mm (W) × 1000mm (D) × 2300mm (H), with panel widths of 800mm or 1000mm available depending on the scheme. It occupies only about 50% of the volume of conventional switchgear.
What is the five-proof interlock function in XGN66-12?
The five-proof interlock prevents:
(1) mis-operation of circuit breakers, (2) loading/disconnecting breakers with load current, (3) closing earthing switches with live busbars, (4) closing circuit breakers when earthing switches are closed, and (5) entering energized compartments. This ensures operator and equipment safety in compliance with IEC62271-200 requirements.
Can XGN66-12 switchgear be used with ring main units?
Yes. The XGN66-12 can be combined directly with ring main units (RMUs), making it an excellent candidate for secondary substations and switch stations. This interoperability provides network redundancy and load sharing flexibility without locking you into a single vendor's ecosystem.
What is the mechanical life of the vacuum circuit breaker in XGN66-12?
The ZN63-12 vacuum circuit breaker in XGN66-12 switchgear has a mechanical endurance of 10,000 operations or more, with 50 rated short-circuit breaking operations. The rated operating sequence is O-0.3s-CO-180s-CO.
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