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XGN15-12 Box Type Fixed Ring Main Unit Switchgear.jpg

XGN15-12 Box-type Fixed Ring Main Unit Switchgear - Reliable 12kV Solution from China Suppliers & Factory

The XGN15-12(F) and XGN15-12(F·R) are advanced 12kV, 630A fixed indoor AC metal-enclosed switchgear units designed for efficient power control and protection. As premier solutions for ring main or radial power supply systems, they are ideally suited for prefabricated substations. Featuring SF6 load switches or fuse-combination load switches, this next-generation switchgear offers a compact design, easy operation, and exceptional reliability. Manufactured in China, these units are an excellent choice for urban grid renovation and construction projects. Trustworthy suppliers and factories enhance their appeal to customers seeking high-quality power solutions

Product Details

Product Model

Technical Parameters

Name	Unit	Value
Rated Voltage	kV	12
Rated Frequency	Hz	50
Main Bus Rated Current / Fuse Maximum Rated Current	A	630 / 125
Main and Ground Loop Rated Short-time Withstand Current	kA/S	20 / 3
Main and Ground Loop Rated Peak Withstand Current	kA	50
Main and Ground Loop Rated Short-circuit Making Current	kA	50
Load Switch Full Capacity Breaking Times	Times	100
Fuse Breaking Current	kA	31.5 / 40
Rated Closed Loop Breaking Current	A	630
Rated Transfer Current	A	1600
Mechanical Life	Times	2000
1min Power Frequency Withstand Voltage (peak) Relative to Ground / Isolation Clearance	kV	42 / 48
Lightning Impulse Withstand Voltage (peak) Interphase to Ground / Isolation Clearance	kV	75 / 85
Secondary Circuit 1min Power Frequency Withstand Voltage	kV	2
Protection Level	—	IP3X

Structural Features

XGN15-12 Box Type Fixed Ring Main Unit Switchgear Structure

Cabinet Structure

The ring main unit cabinet is made of 2mm thick aluminum-zinc plate (or cold-rolled plate after powder coating) riveted and formed. There are two pressure release holes at the back of the cabinet, one for the cable compartment and the other for the load switch/main busbar compartment. This structure ensures maximum protection for personal safety and reliable operation of the equipment.

Various Compartmentalized Small Rooms

1Busbar Compartment

Located at the top of the cabinet and connects adjacent switchgears.

2Load Switch

An independent unit, filled with SF6 gas internally.

3Cable Compartment

Approximately 75% of the space is used for cable connections, fuses, grounding switches, and the installation of CTs and PTs.

4Mechanism Room and Interlocking

Contains operating mechanisms and interlocks, as well as position indicators, auxiliary contacts, trip coils, live displays, and interlocks.

5Relay Box

Located at the top of the cabinet and is optional. Used to install special devices such as instruments, relays, and motor units.

6Circuit Breaker Room

A circuit breaker (SF6 or vacuum) can be placed below the load switch.

Pressure Release

↑Upper Pressure Release

Used to release the gas pressure generated in the busbar and load switch room during internal arc faults.

↓Lower Pressure Release

Used to release the gas pressure generated in the cable compartment during internal arc faults.

Dimension	Unit	Value
Circuit Breaker Cabinet Width	mm	750
Other Cabinet Width	mm	375 / 500
Height	mm	1600 / 1850
Depth	mm	980 / 900
Relay Box Height	mm	450

Frequently Asked Questions

What is the rated voltage of the XGN15-12 Ring Main Unit Switchgear?

The XGN15-12 Box Type Fixed Ring Main Unit Switchgear has a rated voltage of 12 kV, making it suitable for medium-voltage power distribution systems operating at this voltage level.

What type of insulating medium is used in the load switch of the XGN15-12?

The load switch in the XGN15-12 is an independent unit filled with SF6 (sulfur hexafluoride) gas internally, which provides excellent arc-quenching and insulating properties for reliable switching performance.

What is the protection level (IP rating) of the XGN15-12 switchgear?

The XGN15-12 Ring Main Unit Switchgear carries an IP3X protection level, providing protection against solid objects greater than 2.5mm in diameter while ensuring safe and reliable operation in typical indoor environments.

What cabinet dimensions are available for the XGN15-12 switchgear?

The circuit breaker cabinet width is 750mm, while other cabinet variants are available in widths of 375mm or 500mm. Height options are 1600mm or 1850mm, and depth options are 980mm or 900mm. An optional relay box adds 450mm in height.

How does the pressure release mechanism work in the XGN15-12?

The XGN15-12 features two pressure release holes at the back of the cabinet. The upper release vent handles gas pressure from the busbar and load switch room during internal arc faults, while the lower vent manages pressure from the cable compartment, ensuring personnel safety and equipment integrity.

What is the mechanical life and short-circuit withstand capability of the XGN15-12?

The XGN15-12 switchgear has a mechanical life of 2,000 operations. It supports a rated short-time withstand current of 20 kA/3s and a rated peak withstand current of 50 kA, ensuring robust performance under fault conditions.