Smart Ring Main Unit

GTXGN-12 Solid-Insulated Ring Main Unit

The GTXGN-12 solid-insulated ring main unit provides an SF6-free option for 12 kV secondary distribution. Its compact, enclosed construction uses solid insulation around the switching components, making it suitable for cable ring networks, switching points and compact substations.

Rated at 630 A, the series supports distribution-automation and feeder terminal unit (FTU) integration. Switching and protection units, cable interfaces and monitoring signals are configured around the network's single-line diagram, allowing the RMU to meet the circuit and control requirements of each distribution point.

Technical Specifications

Rated Voltage	12 kV
Rated Frequency	50 Hz
Rated Current	630 A
Short-Circuit Breaking Current	25 kA (circuit-breaker unit)
Insulation Medium	Solid (SF6-free)
Switching Units	Load switch / switch-fuse / vacuum circuit breaker
Enclosure IP Rating	IP3X (enclosure)
Automation	Distribution-automation / FTU ready

Key Features

SF6-free solid insulation — environmentally friendly.
Distribution-automation (DA / FTU) ready.
Compact sealed design intended to reduce routine maintenance; inspection follows the equipment manual and site conditions.
For smart urban distribution networks.

Typical Applications

Residential estates and shopping centres
Airports, metro systems and tunnels
Wind-power sites and industrial facilities

Installation & Aftercare

Prepare the site, plan routine checks and keep service records.

What needs to be ready before installation?

Set the assembly on its specified foundation with room for cable terminations, operating access and opening compartment doors.
Coordinate cable connectors, earthing and any pressure-relief path with the supplied drawings; protect external compartments from condensation.
Where remote operation is required, provide the agreed auxiliary supply, actuator wiring, status signals and communications connection.

What should operators check during routine rounds?

Observe switching indications, alarms and any FTU communication faults; inspect enclosure seals and cable-entry condition.

What is covered during planned maintenance?

During isolated servicing, qualified personnel inspect accessible insulation, mechanisms, interlocks, cable terminations and earthing connections.
Test the specified local and remote functions after maintenance; investigate tracking, damaged insulation or failed position indications before reuse.

Customization Options

Define the electrical configuration and the details needed for your site.

Network arrangement: Incoming ring circuits, transformer feeders, terminal supplies and future extension requirements.
Switching units: Choose from this model’s listed load-switch, switch-fuse and breaker units; match protection to the transformer or feeder.
Protection & metering: Fuse or relay protection arrangement, CT ratios, metering and fault-indication requirements.
Cable interfaces: Cable count, cross-section, termination type and earthing connections.
Controls & automation: Operating mechanism, auxiliary supply, FTU interface and required remote status or control signals.

Project-specific options and accessories are confirmed in the quotation and approved drawings.