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HXGN-12 Fixed-Type Ring Network Cabinet

Fixed-type metal-enclosed ring network cabinet for compact substations. Simple, reliable design for secondary substations. HXGN-12 fixed-type ring network cabinet is an indoor AC metal-enclosed switchgear designed for 12kV three-phase distribution systems. This ring main unit features a fixed-type circuit breaker configuration with a compact footprint suited for secondary distribution networks, compact substations, and commercial power centers. Built to relevant IEC standards, this MV switchgear provides reliable feeder protection and load switching with SF6 or vacuum interruption technologies. Rated for 12kV operation, HXGN-12 is widely deployed in utility ring networks, residential complexes, and industrial distribution applications where space efficiency and operational simplicity are key requirements.

Overview
Applications
Technical Data
Services
Quality Control
Recommended Products

HXGN-12 Fixed-Type Ring Main Unit - 12kV Compact Switchgear

HXGN-12 is a fixed-type, air-insulated, metal-enclosed ring main cabinet for 12kV secondary distribution. It houses a load break switch, earthing switch and optional HV fuse protection in a compact enclosure roughly half the width of a withdrawable KYN28 panel, making it the standard solution for compact substations, distribution kiosks and ring feeder switching points.

FIXED VERSUS WITHDRAWABLE - A DELIBERATE TRADE-OFF
HXGN-12 does not have a withdrawable breaker trolley, and that is the point. In secondary distribution, the switching device operates infrequently and is not expected to be removed for maintenance during its service life. Removing the trolley mechanism eliminates the racking rails, isolating contacts, interlock linkage and the floor space they demand, which lowers cost and shrinks the footprint substantially. Where a feeder does need short-circuit interruption, a load break switch and HV fuse combination provides it at a fraction of the cost of a vacuum breaker.

Specify KYN28-12 instead when the application requires frequent breaker operation, full short-circuit breaking on every feeder, or breaker removal without a busbar outage.

THREE-POSITION SWITCHING
The load break switch provides Closed, Open and Earthed positions from a single mechanism. The earthed position is mechanically interlocked and visible, giving a positive earth before cable work without any separate earthing device. This is the core safety feature of ring main switchgear and removes an entire class of operator error.

RING NETWORK OPERATION
In a ring feeder, two switch units connect the incoming and outgoing ring cables and a third feeds the local transformer. If a cable section faults, the ring is re-configured by opening one switch and closing another, restoring supply to every customer except those on the faulted section. This is why urban and industrial estate distribution is built on ring main units rather than radial feeders.

MARKET FIT
Serves 11kV networks across the Middle East and Africa; in Russia, CIS and Eastern Europe it serves 10kV networks. Air insulation means no SF6, avoiding F-Gas reporting and end-of-life gas recovery obligations - an increasingly significant factor in EU and Eastern European procurement. For high-dust, coastal or flood-prone sites, the sealed C-GIS CGC-12 is the more robust alternative.

Typical Applications

PRIMARY APPLICATIONS
- Compact and packaged substations serving residential developments, commercial buildings and small industrial units.
- Urban ring feeder switching points on 10kV and 11kV cable networks.
- Industrial estate and free-zone internal distribution networks.
- Distribution kiosks and pad-mounted substation enclosures.
- Building services substations in hotels, malls, hospitals and office towers.
- Small and medium renewable generation connection points.
- Rural and peri-urban electrification schemes across Africa, where cost per connection governs the design.
- Transformer protection using the load break switch and HV fuse combination.

TYPICAL CONFIGURATIONS
Two-unit: ring in, ring out. Three-unit: ring in, ring out, transformer feeder. Four-unit and above: additional feeders or a metering cell. Units are extensible on site as the network grows.

REGIONAL FIT
- Middle East: 11kV secondary distribution for residential and commercial developments. Note that in high-dust and coastal locations a sealed SF6 unit is generally the better technical choice.
- Africa: high-volume electrification and housing projects on 11kV networks, where the cost advantage over withdrawable switchgear is decisive at scale.
- Russia and CIS: 10kV secondary distribution, available in GOST 15150 climatic versions.
- Eastern Europe: 10kV distribution, with air insulation avoiding F-Gas obligations.

NOT SUITABLE FOR
Applications requiring full short-circuit breaking capability on every feeder without fuses - specify KYN28-12. Installations subject to flooding, heavy sand ingress or persistent salt fog - specify the sealed C-GIS CGC-12. Systems above 12kV - specify HXGN-24.

Technical Data

TECHNICAL DATA - KYN28-24

Category	Item	Specification
Compliance	Standards	IEC 62271-200, IEC 62271-103
Electrical Ratings	Rated voltage	12 kV
	Rated frequency	50 Hz / 60 Hz
	Power-frequency withstand (1 min)	42 kV
	Lightning impulse withstand (BIL)	75 kV peak
	Rated normal current — load break switch	630 A
	Rated normal current — busbar	630 A
	Short-circuit making current	40 kA peak
	Short-time withstand current	16 kA / 20 kA for 1 s
	Load break switch breaking capacity	630 A
	Optional VCB module breaking capacity	20 kA / 25 kA
Gas System	Insulation medium	SF6, hermetically sealed
	Rated filling pressure (gauge)	0.04–0.05 MPa
	Sealed-for-life design	20+ years, no refilling required
	Gas monitoring	Pressure gauge with low-pressure indication; optional density switch & remote alarm
Construction	Protection degree	IP65
	Tank material	Stainless steel 304, welded & hermetically sealed
	Switch type	Three-position — Closed / Open / Earthed
	Number of switch units	2 to 5, configurable
	Cable connection	Fully screened separable elbow connectors, 200 A / 400 A / 630 A, bottom entry
	Operation	Manual lever standard; motorised AC/DC 110V or 220V optional
	Interlocking	Mechanical, enforcing switch–earth–cable access sequence
Dimensions	Overall (W × D × H)	Approx. 900 × 600 × 1100 mm (typical 3-unit)
Dimensions	Weight (approx.)	250–400 kg depending on configuration
Service Conditions	Ambient temperature	−25 °C to +55 °C
	Altitude	≤1000 m standard; ≤2000 m on request
	Relative humidity	Unrestricted — sealed construction
	Installation	Indoor, outdoor kiosk, pad-mounted or below-grade chamber

Services

PRE-SALES ENGINEERING
- Single-line diagram review and panel schedule development from your load list.
- Equipment selection verified against destination grid: 11kV/13.8kV/22kV/33kV (Middle East, Africa), 6kV/10kV/35kV (Russia & CIS), 10kV/20kV/35kV (Eastern Europe). Saudi Arabian projects are designed and verified at 60Hz.
- Ambient derating study. IEC 62271-1 rates equipment at +40 C; we recalculate continuous current for 50-55 C Gulf conditions or supply GOST 15150 climatic versions (UHL1 to -60 C) for CIS sites.
- Short-circuit and protection coordination check against your upstream fault level.
- 2D/3D general arrangement drawings, foundation and cable-entry layouts before production release.

MARKET ACCESS AND DOCUMENTATION
We prepare the technical dossier behind the approval, which is normally the longest item on the project critical path:
- Saudi Arabia: SASO / SABER product certificate (PCoC) and per-shipment certificate (SCoC); SEC material approval support and witnessed factory acceptance testing.
- UAE / Qatar / Kuwait / Oman: documentation packs for DEWA supplier registration, KAHRAMAA material approval, MEW submission and Oman DCRP product approval (mandatory since 2018).
- Iraq: ICIGI certificate of conformity via COSQC-appointed inspection bodies.
- Africa: SONCAP PC and SC for Nigeria, KEBS PVoC (Route A/B/C) for Kenya, TBS / UNBS / GSA certificates elsewhere. Pre-shipment inspection and container sealing coordinated with the appointed agency.
- Russia & CIS: GOST R certification for medium voltage equipment, with EAEU authorised-representative support.
Note that first-time utility approval typically takes 2-12 months depending on the authority. Start this in parallel with order placement, not after.

FACTORY ACCEPTANCE AND DELIVERY
- Routine testing on every panel per IEC 62271-200: power-frequency withstand, main-circuit resistance, mechanical operation, interlock verification, auxiliary circuit function.
- Customer or third-party witnessed FAT (SGS, BV, TUV, Intertek) available on request. Saudi SEC projects require SEC-engineer witnessed FAT.
- Seaworthy export packing: plywood case, desiccant, moisture barrier, shock and tilt indicators for MV assemblies.
- Documentation set: test reports, type-test certificates, GA and schematic drawings, O&M manual, spare parts list, packing list. Manuals available in English, Russian, French and Arabic.

AFTER-SALES
- Commissioning supervision and on-site installation guidance, remote or by engineer dispatch.
- Operator and maintenance training, on-site or online.
- Recommended two-year spare parts list quoted with the order - the single most effective way to avoid extended outages in markets where local spares are unavailable.
- Technical response within 24 hours; consumable spares (contacts, insulators, coils, mechanisms) held in stock for fast dispatch.
- Warranty: 18 months from delivery or 12 months from commissioning, whichever expires first. Extended terms negotiable for framework agreements.

Quality Control

DESIGN VERIFICATION AND TYPE TESTING
- Type tested to IEC 62271-200 for AC metal-enclosed switchgear: power-frequency and lightning impulse withstand, short-time and peak withstand current, temperature rise, making and breaking capacity, mechanical endurance, and degree of protection.
- Internal arc classification (IAC) verified by test, with pressure relief flaps and exhaust ducting proven to contain the arc and protect the operator. This is a distinct qualification from dielectric withstand and should be requested explicitly in tender documents.
- Third-party type-test reports from KEMA, ASTA, CESI or TUV available. Note that an ASTA certificate is signed by an ASTA observer who takes responsibility for the report, which is why utility and EPC procurement treats it differently from a manufacturer's own test record.

INCOMING MATERIAL CONTROL
- Vacuum interrupters, operating mechanisms, protection relays and instrument transformers accepted only from qualified suppliers against certificate of conformity.
- Copper busbar verified for conductivity, cross-section and plating thickness.
- Epoxy insulation components partial-discharge tested on receipt.
- Steel sheet thickness and powder-coat film thickness verified per batch; standard finish RAL 7035.

IN-PROCESS INSPECTION
- Enclosure dimensional and squareness check after fabrication.
- Busbar torque verification with calibrated wrenches, recorded against each joint.
- Wiring verified point-to-point against the approved schematic before energisation.
- Mechanical interlock sequence proven on every panel: breaker cannot be racked in with the earthing switch closed, earthing switch cannot be closed with the breaker closed, cable compartment door cannot be opened unless earthed.

ROUTINE TESTING - EVERY PANEL, NO SAMPLING
- Power-frequency withstand voltage on the main and auxiliary circuits.
- Main circuit resistance measurement, compared against the design baseline.
- Mechanical operation test through the full Service / Test / Isolated sequence.
- Protection and control function test, including trip and close from the relay.
- Degree of protection and paint film verification.
- Each panel is issued a serialised routine test report.

TRACEABILITY AND SYSTEM
- ISO 9001 quality management system.
- Serial number traceability from finished panel back to vacuum interrupter, mechanism and insulation component batch.
- Test records retained and retrievable for the warranty period and beyond, which matters when a utility raises a query years into service.

ENVIRONMENTAL QUALIFICATION
Standard IEC ratings assume a +40 C ambient. Where the destination demands more, we verify accordingly: temperature-rise testing at elevated ambient for Gulf projects, salt-spray testing for coastal installations, and GOST 15150 climatic versions with low-temperature functional verification for CIS deployment.