Siemens Authorized Series · Licensed Assembly

SIVACON 8PT
Low Voltage Switchgear

GOHO® builds and exports the SIVACON 8PT low‑voltage switchgear assembly under license from Siemens Ltd., China. It is a modular, type‑tested system of compartmented functional units — incoming and outgoing feeders, bus couplers, motor starters and power factor correction — engineered to your single‑line diagram.

  • Type-tested to IEC 61439-1/-2
  • Busbar up to 7400 A
  • Internal arc tested (IEC TR 61641)
Get a Quote View Specifications
SIVACON 8PT low voltage switchgear assembly built by GOHO Electric under Siemens license.
Horizontal Busbar
Up to 7400 A Single, three-ply or double three-ply system
Internal Separation
Up to Form 4b To IEC 61439-2, up to category 7
Degree of Protection
IP30 – IP54 Indoor installation, IR 3

Technical Specifications

ItemSpecification
StandardsIEC 61439-1 & IEC 61439-2; internal arc tested to IEC TR 61641; degree of protection to IEC 60529
ApplicationPower distribution and motor control (MCC)
Rated insulation voltage (Ui)690 V / 1000 V
Rated operational voltage (Ue)Up to 690 V AC (50 / 60 Hz)
Rated impulse withstand voltage (Uimp)8 kV / 12 kV
Overvoltage categoryIII / IV
Rated current of horizontal busbar (In)Up to 7400 A
Rated short-time withstand current (Icw)Up to 150 kA / 1 s
Rated peak withstand current (Ipk)Up to 375 kA
Rated conditional short-circuit current (Icc)100 kA
Internal arc fault50 kA / 0.3 s at 690 V; 100 kA / 0.5 s at 415 V
Internal separationUp to Form 4b to IEC 61439-2 (up to category 7, each functional unit with its own connection box)
Degree of protectionIP30, IP31, IP40, IP41, IP42 (ventilated) · IP40, IP54 (non-ventilated)
Earthing systemTT / IT / TNS / TNC
CommunicationProfibus, Profinet, Modbus
Surface finishGalvanized / Aluzinc / powder coated / painted
Application environmentIndoor, IR 3

* Ratings above describe the licensed SIVACON 8PT platform. The final rating of each project follows the approved single‑line diagram and the selected protective devices. Contact us for the type‑test documentation relevant to your specification.

Frame, Enclosure & Busbar System

ItemSpecification
Frame constructionScrewed or welded steel profile; 25 mm modular hole pitch for later extension
Sheet thicknessFrame 2.5 mm · enclosure 2.0 mm
Horizontal busbar positionTop of the cubicle, with arc barrier to limit internal arc faults
Single-ply busbar systemIn ≤ 3200 A · cubicle 2200 × 600 / 800 / 1000 mm
Single three-ply busbar systemIn ≤ 5000 A · cubicle 2200 × 800 / 1000 / 1200 mm
Double three-ply busbar systemIn ≤ 7400 A · cubicle 2600 × 800 / 1000 / 1200 mm
Busbar short-circuit ratingIcw / Ipk up to 150 kA (1 s) / 375 kA
Busbar compartmentSegregated from the device compartment; coupled from the cubicle top
Door opening angleUp to 180° single cubicle · more than 140° when coupled
Cubicle dimensions H × W × D (mm)H 2200 / 2600 · W 400 / 600 / 800 / 1000 / 1200 · D 600 / 800 / 1000 / 1200
Cable connectionTop or bottom entry; front or rear connection
InstallationWall‑mounted or free‑standing
Horizontal busbar system inside a SIVACON 8PT low voltage switchgear cubicle, seen with the door open and the busbar compartment exposed.
Horizontal busbar system. The bars run along the top of the cubicle behind an arc barrier, with the busbar compartment segregated from the device compartment. Coupling from the cubicle top is what lets a line‑up be extended at either end without disturbing the live section.
Busbar compartment Device compartment Single group · two-ply In ≤ 3200 A Single group · three-ply In ≤ 5000 A Double group · three-ply In ≤ 7400 A Horizontal busbar Switchgear device — breaker or drawer unit
Horizontal busbar systems. Busbars sit at the top of the cubicle and are coupled from above, so a board can be extended without dismantling it. Two-ply, three-ply and double three-ply arrangements cover 3200 A, 5000 A and 7400 A within a 2200 mm or 2600 mm cubicle height.

Design Variants

One cubicle platform covers the whole low‑voltage line‑up, so incomers, bus couplers, feeders, motor starters and compensation can be combined in a single continuous board.

SIVACON 8PT FCB1 cubicle — one air circuit‑breaker per cubicle for high‑current feeders
FCB1 Up to 6300 A

One air circuit‑breaker per cubicle — high‑current incoming and outgoing feeders.

SIVACON 8PT FCB2 cubicle — two air circuit‑breakers, the upper one usable as a bus coupler
FCB2 / FCB2BC 2000 / 2500 A

Two air circuit‑breakers per cubicle; the upper device can serve as a bus coupler.

SIVACON 8PT FCB3 cubicle — three air circuit‑breakers serving incoming and outgoing feeders
FCB3 Up to 1600 A

Three air circuit‑breakers per cubicle for incoming and outgoing feeders.

SIVACON 8PT OFF3 fixed‑mounted cubicle with moulded‑case circuit‑breaker feeders
OFF3 Up to 630 A

Fixed‑mounted cable feeder modules with moulded‑case devices, separation 3b / 4b.

SIVACON 8PT OFF6 fixed‑mounted cubicle with air and moulded‑case circuit‑breakers
OFF6 ACB up to 1600 A

Fixed‑mounted cubicle mixing air and moulded‑case circuit‑breakers in one 600 mm width.

SIVACON 8PT OFW withdrawable cubicle with drawer units including half‑height drawers
OFW Up to 630 A / 250 kW

Withdrawable functional units, including ½ modules, for cable feeders and motor starters.

SIVACON 8PT PFC power factor correction cubicle
PFC Up to 500 kvar

Power factor correction, non‑detuned up to 500 kvar or detuned up to 350 kvar.

SIVACON 8PT CCS cubicle with free‑design internal layout, shown with the doors open
CCS Up to 1200 A

Customer‑designed cubicle for free arrangement of devices, Icw up to 65 kA.

VariantTypical ApplicationCable EntrySeparation
FCB1Main incomer, large outgoing feederFront or rear / top or bottomDevice, busbar and cable compartments separate
FCB2 / FCB2BCDouble feeder cubicle, bus couplerFront or rearIndependent device compartments
FCB3Multiple outgoing feedersFront or rearIndependent device compartments
OFF3 / OFF6Distribution with high supply continuityRear (OFF6 also side)Form 3b / 4b, each device with own door
OFWMCC and mixed cable feedersFront (400 mm) or rear (600 mm) cable compartmentDraw‑out units, IP20B when withdrawn
PFC / CCSCompensation / free designTo projectPer project requirement
ACB one per cubicle cable / busbar room FCB cubicle Air circuit-breaker MCCB cable room OFF cubicle Fixed-mounted, own door each cable / vertical busbar room OFW cubicle Withdrawable modules
Same cubicle, three internal philosophies. The frame, busbar and cable room are common; what changes is how the protective devices are mounted. FCB gives one air circuit‑breaker a full cubicle, OFF packs fixed modules behind individual doors, and OFW uses withdrawable units that can be replaced while the board is live.

Key Features

Type-Tested Assembly to IEC 61439-1/-2 SIVACON 8PT is a type‑tested assembly: temperature rise, dielectric properties, short‑circuit strength, protective‑conductor continuity, mechanical operation and degree of protection are all verified by test on the standard modules, not calculated per project. Every cubicle also passes routine tests — visual and electrical inspection, insulation test and verification of protective‑circuit continuity — before shipment.
Internal Arc Protection with Roof Pressure Relief The cubicle is verified to IEC TR 61641 with a pressure‑relief duct at the top of the enclosure. If an internal arc occurs, hot gas and energy are released upwards and away from the operating face, and the arc‑tested hinges and door locks keep doors closed. That protects both the operator and the adjacent cubicles in a live board.
Horizontal Busbar up to 7400 A Horizontal busbars are arranged at the top of the cubicle and can be coupled from above, which simplifies extension of an existing board. A single three‑ply system reaches 5000 A within a 2200 mm cubicle height, and a double three‑ply system reaches 7400 A — high current capacity without increasing the footprint or losing device mounting space.
Internal Separation up to Form 4b Busbar, device and cable compartments are segregated, and functional units can be separated up to Form 4b with an individual connection box for every unit. Faults are contained in the compartment where they occur, and maintenance work on one feeder does not disturb the rest of the board.
Modular Frame on a 25 mm Grid The frame is a screwed or welded steel profile with a 25 mm hole pitch, so cubicles can be extended, re‑partitioned or converted later without replacing the structure. Busbars can be flexibly matched to the required current level, and cubicle widths from 400 to 1200 mm cover everything from a small feeder panel to a 7400 A incomer.
½ Withdrawable Units — High Packing Density With ½ draw‑out modules, a cubicle with 1800 mm usable height accepts up to 18 circuits. Standard module heights of 100, 150, 200, 300, 400, 500, 600 and 700 mm, plus two ½ sizes, let each circuit take only the space it needs — fewer cubicles, lower investment, same rating.
Dedicated Secondary Wiring Compartment A separate secondary wiring compartment at the front top of the cubicle shields control wiring from electromagnetic interference and keeps it away from the power compartments. Draw‑out units use dedicated secondary plug‑and‑socket connectors with communication contacts, which supports bus communication as well as conventional control.
Safe Draw-Out Operation Every draw‑out unit shows its three positions — connected, test and disconnected — and is mechanically interlocked against incorrect operation. The test and disconnected positions can be locked, so work on the load side is possible while the board stays live. Above 250 A, a lever mechanism makes inserting and withdrawing the unit much easier.

Cabinet Construction & Safety

Two details decide how a low‑voltage board behaves on a bad day: how far one fault can spread inside the enclosure, and where the energy goes if an arc occurs. Both are designed in, not added later.

Form 1 no internal separation Form 2 busbar separated Form 3 busbar, devices and terminals Form 4b every unit its own terminal box
Internal separation. Every step contains a fault closer to where it started. Form 4b is the highest form the series reaches — each functional unit keeps its own connection box.
Relief duct at cubicle top Internal arc > 20 000 °C Gas and energy released upwards, away from the operating face
Internal arc protection. Verified to IEC TR 61641. Arc‑tested hinges and locks keep the doors closed while the pressure is relieved through the roof, so the operator side stays protected.
Internal view of a SIVACON 8PT low voltage switchgear cubicle with both doors open, showing the frame, horizontal busbar and compartment dividers.
What the separation looks like from inside. Frame, busbar compartment, device zone and cable connection area are divided by steel partitions. Once the doors are closed, the partitions carry the fault current and keep an arc confined to the compartment where it started.

Applications

  • Data centres — main low‑voltage distribution and UPS bypass feeders, where compartmentation keeps a single fault from taking the board down.
  • Commercial buildings and high‑rise risers — floor distribution boards fed from a central 8PT incomer and bus coupler.
  • Solar PV plants — inverter output collection and step‑up distribution, including plant auxiliary supply.
  • Wind farms — turbine‑side auxiliary supply and collector‑system distribution.
  • Metro, rail and airports — traction auxiliary power supply and infrastructure distribution where continuity matters.
  • Cement, steel and heavy process plants — motor control centres with a high concentration of starter circuits.
  • Oil, gas and petrochemical facilities — distribution in harsh environments, with arc‑tested enclosures.
  • Paper mills and other continuous‑process industries — process lines where an unplanned shutdown is costly.

What We Need to Quote Your Line-Up

Because every SIVACON 8PT board is engineered to the project drawing, a few documents are enough for us to come back with a priced cubicle schedule.

  • Single‑line diagram and cubicle schedule
  • System voltage, frequency and earthing system
  • Short‑circuit level (Icw / Ipk) at the board
  • Busbar rating and cable entry direction
  • Required internal separation form
  • Degree of protection (indoor / outdoor duty)
  • Circuit list with device ratings and duties
  • Any metering, protection or communication requirement

Send these to gohointl@gmail.com and we will return a cubicle‑by‑cubicle quotation, including the type‑test documentation relevant to your specification.

License & Documentation

Licensed SeriesLicense No.Issued ByLicensee
SIVACON 8PTSIVACON 8PT/010726/HO/SH/CHSiemens Ltd., ChinaGonghong Electric Appliance Co., Ltd.

License certificate and type‑test documentation are available on request for project qualification.

SIVACON 8PT low voltage switchgear — a finished line‑up of four cubicles comprising incoming, bus coupler and outgoing feeder sections.
A complete 8PT line‑up. Incoming, bus coupler and outgoing feeder cubicles assembled on one frame — the configuration most projects end up with. We build this range under licence from Siemens Ltd., China, and supply it with approved drawings, routine test reports and operating documents.

Every cubicle we ship is assembled in our own factory in Yueqing, Zhejiang — the same site that supplies our medium‑voltage switchgear, transformers and prefabricated substations. Sheet‑metal fabrication, busbar machining, assembly and routine testing all happen in‑house, which is what keeps the schedule and the quality check inside our control.

Need a licensed 8PT line-up for your project?
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SIEMENS and SIVACON are registered trademarks of Siemens AG. GOHO® is a registered trademark of Gonghong Electric Appliance Co., Ltd. Gonghong Electric Appliance Co., Ltd. is an authorized licensee for the SIVACON 8PT low voltage assembly series. Technical data describes the licensed SIVACON 8PT platform; the rating of a specific board follows the approved project drawings and selected devices. Product images are shown for illustration.

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