GTXGN-12/V Solid Insulated Ring Main Unit
The GTXGN-12/V solid insulated ring main unit is manufactured by LYE Technology as a gas-free alternative to SF6 equipment, with a 375 mm cubicle width that matches an SF6 unit footprint. Insulation is solid rather than gaseous, overall partial discharge stays below 10 pC, and the enclosure is rated IP4X at 12 kV, 50 Hz.
- Rated voltage and frequency: 12 kV, 50 Hz
- Rated current: 630 A / 1250 A
- Short-circuit breaking current: 25 kA / 31.5 kA
- Peak withstand current: 63 kA / 80 kA
- Partial discharge: Not greater than 10 pC overall
Solid Insulated Ring Main Unit: Key Features & Typical Use
Solid Insulation, No Gas Handling
The GTXGN-12/V insulates with solid material inside a fully enclosed enclosure rather than with SF6. There is no gas pressure to monitor, no gas to top up and no gas-handling equipment to keep on site, which simplifies both commissioning and the long-term maintenance budget for a distribution board that is expected to sit quietly for decades.375 mm Wide — a Drop-In Replacement
The cubicle is 375 mm wide and the overall dimensions match an SF6 ring main unit, so a solid-insulated board can replace gas-insulated equipment in an existing switchroom without moving walls, cable trenches or busbar penetrations. That makes the series a practical route for upgrading equipment in buildings that cannot be reconfigured.Inspected With the Compartment Closed
Because the insulation is solid and the enclosure is fully closed, inspection and partial-discharge checks can be carried out without opening the live compartment. The overall partial discharge figure is held below 10 pC, which is the number that matters for long-term insulation health in a solid-dielectric design.Precision Sheet Metal Structure
The cubicle body is made from aluminium-zinc coated plate cut by laser, bent on CNC machines and riveted together. Compared with older folded constructions, the process gives a more accurate shell, a stiffer body and more stable performance, and the coated substrate keeps the structure corrosion-resistant without adding weight.Solid Insulated Ring Main Unit Specifications & Technical Data
| Parameter | Details |
|---|---|
| Product | GTXGN-12/V solid insulated ring main unit |
| Design type | Solid insulated, fully enclosed modular ring main switchgear |
| Cubicle width | 375 mm, matching SF6 ring main unit dimensions |
| Enclosure material | Aluminium-zinc coated plate, laser cut and CNC bent, riveted assembly |
| Rated voltage | 12 kV |
| Rated frequency | 50 Hz |
| Rated current | 630 A / 1250 A |
| Rated short-circuit breaking current | 25 kA / 31.5 kA |
| Rated short-time withstand current | 25 kA / 31.5 kA |
| Rated short-time peak withstand current | 63 kA / 80 kA |
| Rated short-circuit making current | 63 kA / 80 kA |
| Partial discharge | Not greater than 10 pC overall |
| Degree of protection | IP4X |
| Maintenance | Closed-compartment inspection and on-site modification possible |
| Design basis | Modular and standardised construction |
GTXGN-12/V — Solid Insulated Ring Main Unit with the Footprint of an SF6 Unit
Replacing switchgear in an occupied building is usually a civil engineering problem before it is an electrical one. The GTXGN-12/V solves that by using the same 375 mm cubicle width and the same overall dimensions as an SF6 ring main unit, so an existing switchroom can take solid-insulated equipment without moving walls, trenches or busbar penetrations.This product is also searched as solid dielectric switchgear, SF6-free ring main unit or solid insulated switchgear (SIS), and it is compared both with gas-insulated units and with air-insulated boards. Because there is no gas pressure to monitor and no handling equipment on site, the lifetime maintenance burden is lower; the questions worth asking a manufacturer are the partial-discharge figure and whether the unit really matches the existing switchroom footprint.Inside, the insulation is solid rather than gaseous. There is no gas pressure to monitor and no handling equipment on site, and because the unit is fully enclosed, inspection and partial-discharge testing are carried out with the compartment closed. Overall partial discharge is held below 10 pC, rated 12 kV, 50 Hz, with 630 A or 1250 A current ratings.The cubicle is built from aluminium-zinc coated plate that is laser cut, CNC bent and riveted, giving a precise shell and a rigid body. The series is designed for modular, standardised layouts in urban and rural distribution networks, industrial parks and commercial buildings where a gas-free alternative to SF6 is preferred.Factory-Direct Solid Insulated Ring Main Unit Manufacturer & OEM / ODM
We Manufacture, You Brand
LYE Technology (Zhejiang) Co., Ltd. is a national high-tech enterprise and manufacturer in Wenzhou, China: sheet-metal fabrication, welding, powder coating, busbar machining and final assembly run on our own factory lines, and every unit is function-tested before it leaves the works. A GTXGN-12/V Solid Insulated Ring Main Unit that reaches your site carries the routine test behind it, not just the rating on the nameplate.We are one of the Top 10 Brands of China's small power distribution boxes and a drafter of national standards in this category, and we hold ISO9001, ISO14001, ISO45001, CCC, CE and TUV certification. Because we are the manufacturer rather than a trading company, our sales engineers quote from your drawing in factory-direct terms, and OEM or ODM work is produced on the same lines as our standard products.For the GTXGN-12/V we laser cut and CNC bend the aluminium-zinc enclosure in-house, so matching an existing switchroom layout is a drawing exercise rather than a new tooling investment.- OEM branding — custom colours, laser marking and your own project or retail packaging, applied at the factory.
- ODM options — ratings, configurations and internal layouts built around your drawings or single-line diagram.
- Certification — ISO9001, ISO14001, ISO45001, CCC, CE and TUV, with test documents supplied per project.
- MOQ — flexible quantities for a project or a trial order, with mixed types welcome in one shipment.
GTXGN-12/V 375 mm cubicle matching an SF6 unit footprint
Solid insulated compartment with the enclosure fully closed
Solid Insulated Ring Main Unit Buying Guide from the Manufacturer
Most GTXGN-12/V enquiries start with an existing switchroom that needs new equipment. These are the points we confirm before releasing a drawing.
- Confirm the rated voltage, frequency and the short-circuit rating required by the network.
- Measure the existing switchroom and confirm the 375 mm cubicle width and overall dimensions will fit.
- Confirm whether 630 A or 1250 A current rating is required and how many outgoing ways are needed.
- Check the cable entry direction and the existing trench and termination arrangements.
- Send the single-line diagram, room dimensions and any site photographs.
- Approve drawings, then production with partial-discharge and functional testing before dispatch.
Manufacturer & Sales Support for Wholesale Buyers
OEM / ODM
Learn more →Factory colours · Logo marking · Custom layout
Wholesale
Learn more →Factory pricing · Flexible MOQ · Global shipping
Distributor Support
Learn more →Account manager · Drawing support · Priority lead times
Replacing Gas-Insulated Switchgear in an Existing Room?
OEM/ODM, wholesale pricing and distributor support straight from the manufacturer — one enquiry gets you a factory-direct quotation for the GTXGN-12/V Solid Insulated Ring Main Unit, sized to the existing switchroom dimensions, cable entry arrangement and the network short-circuit rating, with type-test documentation under the applicable standards for 12 kV metal-enclosed switchgear. Our sales team replies with a specification and an indicative price, so send your drawings and quantity.Contact Our Sales TeamSolid Insulated Ring Main Unit — Frequently Asked Questions
What is a solid insulated ring main unit?
A solid insulated ring main unit, sometimes written as solid dielectric or solid insulated switchgear, uses solid insulating material inside a fully enclosed enclosure instead of gas or open air. There is no gas pressure to monitor and no on-site gas handling, and because the unit is fully closed, inspection and partial-discharge testing can be done without opening the live compartment. Overall partial discharge on the GTXGN-12/V stays below 10 pC.What is a solid insulated RMU used for?
It is used to switch and protect sections of a 12 kV distribution ring in urban and rural networks, industrial parks, residential developments and commercial buildings. It is especially useful where SF6 equipment is being phased out, where a switchroom must be upgraded without moving walls or trenches, or where gas handling and monitoring on site is not wanted.What is the difference between a gas insulated and a solid insulated RMU?
A gas insulated RMU seals its switching functions in a gas-filled compartment, which gives excellent compactness but requires gas pressure monitoring and handling. A solid insulated RMU uses solid dielectric material in a fully enclosed enclosure, so there is no gas to top up and no gas handling equipment, at the cost of a slightly different design approach. Both can share the same 375 mm cubicle width.Who manufactures solid insulated ring main units?
Because the design is newer than gas insulated equipment, build quality between manufacturers varies more. Questions worth asking are how the solid insulation is applied, what partial-discharge figure is guaranteed on the finished unit, and whether the enclosure dimensions genuinely match the switchroom being upgraded. LYE manufactures the GTXGN-12/V enclosure in Wenzhou, laser cuts and CNC bends the aluminium-zinc body in house, and holds ISO9001, ISO14001, ISO45001, CCC, CE and TUV certification.How much does a solid insulated ring main unit cost?
Indicative factory-direct pricing is roughly US$3,000 to US$20,000 per cubicle or unit, depending on the current rating, the number of outgoing ways, the protection rating and the quantity. Because these units are usually bought to replace equipment in an existing switchroom, the room dimensions and cable entry arrangement should be sent with the enquiry so the fit, and therefore the cost, can be confirmed before quoting.
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Use a distribution box for final circuits and compact branch protection; use a cabinet when the project needs larger incoming capacity, more feeder groups, metering, busbars or greater internal separation. The final choice should be checked against the single-line diagram, device list, available installation space and local project rules.
Provide the device schedule, circuit quantity, component dimensions, cable-entry direction, mounting method and required spare capacity. LYE also reviews door clearance, bending radius, heat-producing devices and the usable depth behind the mounting plate before confirming an enclosure size.
Start with the actual exposure to dust, rain, cleaning water and accidental contact rather than choosing the highest number by default. Cable entries, ventilation, door seals and installation workmanship affect the finished assembly, so the target rating and verification basis must be confirmed for the specific product and project.
Coated or galvanized steel is commonly considered for general indoor service, stainless steel for humid or corrosive locations, and engineering plastic for lightweight non-metallic applications. Material grade, thickness, UV exposure, chemical contact and earthing requirements must be confirmed against the installation environment.
Share the component heat load, ambient temperature, solar exposure, duty cycle and allowable internal temperature. LYE can then review enclosure volume, spacing, ventilation or fan provisions, sun shields, heaters or drainage details; the final thermal design remains tied to the installed equipment and site conditions.
Yes. A dimensioned drawing is preferred, but a physical sample and clear reference photographs can also start the review. Material, thickness, openings, hardware, finish, labels, inspection points and packing are recorded before sampling or repeat production.
PDF and common 2D CAD drawings are suitable for most enclosure enquiries, while 3D files can help with complex assemblies. Include a revision number, units, tolerances and component references; file compatibility and any missing production information will be confirmed during review.
A sample or first article can be arranged for a new or customized product. The approval plan should identify dimensions, openings, fit, appearance, hardware, labels and packaging, together with the sample cost and timing agreed for the actual order.
Available documents may include approved drawings, packing lists, dimensional or appearance inspection records, product data and certificates applicable to the confirmed model. Destination-specific declarations or third-party testing must be requested before order placement so availability and scope can be verified.
Lead time is confirmed after the product scope, quantity, sample requirement and finish are known. Packing is reviewed against product weight, surface protection, destination and shipping method; if an issue is found after delivery, send the order reference, label, photographs and quantity affected so it can be traced and reviewed.
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