Siemens Authorized Series · Licensed Assembly

SIBOARD
Low Voltage Distribution Boards

GOHO® builds and exports the SIBOARD low‑voltage distribution board system under license from Siemens Ltd., China. One modular platform — SIBOARD 125, 630 and 800 — covers incoming currents from 125 A to 800 A in flush‑mounted, wall‑mounted and floor‑standing enclosures, assembled and routine‑tested to your panel schedule.

Type-tested by VDE to IEC 61439-1/-2/-3
Incoming current 125–800 A
Degree of protection up to IP54

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SIBOARD low voltage distribution board range built by GOHO Electric under Siemens license — flush-mounted, wall-mounted and floor-standing enclosures.

Incoming Current: 125 – 800 A SIBOARD 125 · 630 · 800
Mounting Forms: Flush · Wall · Floor One enclosure platform, three installation forms
Type-Tested Assembly: VDE to IEC 61439-1/-2/-3 Full type test incl. IP and IK verification

Technical Specifications

Item	SIBOARD 125	SIBOARD 630	SIBOARD 800
Rated current In (A)	125	630	800
Rated operational voltage Ue (V AC)	400	690	690
Rated insulation voltage Ui (V)	400	690	690
Rated impulse withstand voltage Uimp (kV)	6	6	6
Overvoltage category	III	III	III
Rated peak withstand current Ipk (kA)	17	53	74
Rated short-time withstand current Icw, 1 s (kA)	10	25	35
Degree of protection (IEC 60529)	IP30 / IP31D / IP43	IP30 / IP54	IP30 / IP54
Impact resistance (IK)	IK10	IK10	IK10
Safety class	I	I	I
Standard colour	RAL 7035 light grey	RAL 7035 light grey	RAL 7035 light grey
Enclosure sheet thickness (mm)	1.5	1.5	1.5
Internal separation	Form 1	Form 1	Form 1
Mounting	Flush / wall	Wall / floor	Floor
GB standard	GB 7251.1 / 7251.3	GB 7251.1 / 7251.12	GB 7251.1 / 7251.12
IEC standard	IEC 61439-1 / -3	IEC 61439-1 / -2	IEC 61439-1 / -2
Type approval	VDE	VDE	VDE

Enclosure Dimensions H × W × D (mm)

Dimension	SIBOARD 125	SIBOARD 630	SIBOARD 800
Height	400 / 600 / 800 / 1000 / 1200	400 / 600 / 800 / 1000 / 1200 / 2000 *	2000
Width	600	300 * / 600 / 900 / 600+250	300 / 600 / 900 / 600+250
Depth	140	250	400

* 2000 mm enclosure height and 300 mm width are available on floor‑standing versions only. Ratings above describe the licensed SIBOARD platform; the final configuration of a specific board follows the approved panel schedule and the selected protective devices. Contact us for the type‑test documentation relevant to your specification.

Series Range & Mounting Options

SIBOARD sits downstream of the main switchgear. Where a SIVACON 8PT board carries the incoming supply of a building or plant, SIBOARD distributes it further out — floor by floor, workshop by workshop, outbuilding by outbuilding — at currents up to 800 A. Three enclosure sizes and three mounting forms are covered by one design, one set of mounting parts and one set of drawings.

Where SIBOARD fits. The series takes over downstream of the main switchgear, where circuits branch out and boards get smaller. Because the whole range shares one modular design, a board can be specified at 125 A in a riser cupboard and at 800 A in a plant room without changing supplier, drawings or assembly method.

SIBOARD 125 low voltage distribution board — flush-mounted enclosure for small final distribution boards

SIBOARD 125 In up to 125 A

Flush‑mounted or wall‑mounted enclosure. Standardised mounting parts and a flexible device layout for small final distribution boards.

SIBOARD 630 low voltage distribution board — wall-mounted enclosure with modular device rows

SIBOARD 630 In up to 630 A

Wall‑mounted or floor‑standing enclosure with more mounting room and more installation options, for the busier boards on a site.

SIBOARD 800 low voltage distribution board — floor-standing enclosure for the highest rating of the series

SIBOARD 800 In up to 800 A

Floor‑standing enclosure for the highest rating of the series and the most demanding installation conditions.

Series	Mounting	Rated Current	Typical Enclosure H × W × D (mm)	Separation
SIBOARD 125	Flush / wall	125 A	450 × 660 × 140	Form 1
SIBOARD 630	Wall / floor	630 A	850 × 660 × 250	Form 1
SIBOARD 800	Floor	800 A	2050 × 660 × 400	Form 1

Typical enclosure sizes are the ones used by the standard schemes shown further down this page. Enclosure height and width are selected from the size matrix in the specification table above.

Modular Design & Fast-Install Kits

What makes the series quick to build is that almost nothing has to be drilled, measured or fabricated on site. Devices sit on pre‑assembled kits that locate in the enclosure on a fixed grid, so two boards with the same panel schedule are assembled the same way by any fitter — and a board can be extended later without reworking what is already there.

Fast-Install Kits

Kit	Function	Series
Modular DIN-rail kit, 150 mm height	One row of modular devices on standard DIN rail — 24 module widths (MW) usable per row, on an 18 mm grid	SIBOARD 630 / 800
Modular DIN-rail kit, 200 mm height	Same 24 MW row with extra depth above the devices for wiring and incoming terminals	SIBOARD 630 / 800
MCCB mounting kit, horizontal	Moulded‑case circuit‑breaker mounted horizontally, with a cover plate for the device face	SIBOARD 630 / 800
MCCB mounting kit, vertical	Moulded‑case circuit‑breaker mounted vertically, used for incoming devices and for dual‑supply boards	SIBOARD 630 / 800
Isolator mounting kit	Switch‑disconnector with direct centric operation or a door‑coupled rotary mechanism, 63–630 A	SIBOARD 630 / 800
Mounting plate kit	Modular plate carried on the mounting bracket, in an upper or lower position, for non‑rail devices	SIBOARD 630 / 800
Busbar support	Support and phase spacing for the internal busbar run	SIBOARD 630 / 800

Device width per row. A row carries 24 module widths, and because every kit is built on the same 18 mm grid, a free‑design layout stays as predictable to build as a catalogue one. Going from one row to three multiplies the usable width, not the enclosure footprint.

SIBOARD 125 distribution board internal mounting space with modular DIN rails and miniature circuit-breakers — **SIBOARD 125.** Modular rail rows in a 400 × 600 mm mounting space.

SIBOARD 630 distribution board internal device layout with moulded-case circuit-breakers and terminal rails — **SIBOARD 630.** Moulded‑case incomer above the modular rows.

SIBOARD 800 floor-standing distribution board internal layout with busbar run, modular device rows and cable connection area — **SIBOARD 800.** Full‑height layout with busbar and cable area.

Busbar & Internal Layout

Inside the board the busbar run, the device rows and the cable connection area are kept in separate zones, so wiring a board is a matter of following guides rather than deciding where things go. Devices are supplied from the busbar by pre‑formed connections, and outgoing cables land in a terminal area at the bottom or at the side.

Inside a SIBOARD board. Three zones from top to bottom: busbar, devices, cables. The separation is a working arrangement rather than a form of internal separation — the series is Form 1 — and it keeps wiring, devices and outgoing cables from competing for the same space.

Busbar system inside a SIBOARD low voltage distribution board, shown with the busbar run and modular devices — **Busbar and device layout.** The busbar support kit fixes the phase spacing, so the same components work whether the board is 300, 600, 900 or 600+250 mm wide. The board below shows modules landed on the busbar with the outgoing terminals kept clear.

Devices the Series Is Designed For

Device Family	Typical Use in the Board	Mounting
Moulded-case circuit-breaker — 3VA	Incoming device and large outgoing feeder, 100–630 A	MCCB kit, horizontal or vertical
Switch-disconnector — 3KF / 3KD	Main isolator ahead of the outgoing ways, 63–630 A	Isolator kit, direct or door‑coupled operation
Automatic transfer switch — 3KC	Dual‑supply changeover, mechanically and electrically interlocked	Mounting plate kit
Modular devices — 5S series	Miniature circuit‑breakers, RCDs, RCBOs, SPDs and modular control devices	Modular DIN‑rail kit, 24 MW per row
Metering and gateway — 7KT / 7KM / 7KN	Power measurement and field‑level data collection	Modular DIN‑rail kit, one MW wide
Motor control — SIRIUS 3RV / 3RT / 3RU / 3RB / 3RW	Motor protection, contactors, overload relays and soft starters in combination boards	Mounting plate kit

Device families listed are those the licensed SIBOARD design and its fast‑install kits are prepared for. The devices actually fitted to a board are those named in your approved panel schedule.

Typical Configurations

Five standard schemes cover a large part of day‑to‑day sub‑distribution work: a small lighting board in the 125 enclosure, two ways of building a 630 lighting board, and two versions of a dual‑supply board in the 800 enclosure. They are worked examples rather than fixed products — the same kits accept a free device layout when your panel schedule differs.

Standard Scheme	Enclosure H × W × D (mm)	Kits Used	Devices
125 lighting board	450 × 660 × 140	Modular DIN‑rail kit, 200 mm × 2	Miniature circuit‑breakers, RCDs and an SPD on two rows — 24 MW per row
630 lighting board, option 1 — isolator incomer	850 × 660 × 250	Modular DIN‑rail kit, 150 mm × 4; modular DIN‑rail kit, 200 mm × 1	Switch‑disconnector 200 A as main isolator, then four rows of miniature circuit‑breakers, RCDs and an SPD
630 lighting board, option 2 — breaker incomer	850 × 660 × 250	MCCB kit, horizontal × 1; modular DIN‑rail kit, 200 mm × 3	Moulded‑case circuit‑breaker 250 A mounted horizontally as incomer, then three rows of modular outgoing devices
800 dual‑supply board, option 1	2050 × 660 × 400	MCCB kit, vertical × 1; mounting plate × 1; panel × 1; modular DIN‑rail kit, 200 mm × 5	Moulded‑case circuit‑breaker 250 A vertical, automatic transfer switch, indicators and meters on the door panel, five rows of modular devices
800 dual‑supply board, option 2 — with control section	2050 × 660 × 400	MCCB kit, vertical × 2; mounting plate × 2; panel × 1; modular DIN‑rail kit, 200 mm × 1	Two vertical moulded‑case circuit‑breakers, automatic transfer switch, a contactor and overload relay combination, one row of modular devices

Every row of modular devices provides 24 module widths of usable mounting space, with 18 mm to one module width.

Three boards, one common scale. All three enclosures are 660 mm wide, so the comparison is a comparison of height. The 125 lighting board is two kit rows tall, the 630 board five, and the 800 dual‑supply board fills 2000 mm of mounting height — which is why one series can start at a corridor box and end at a plant room board.

Dual-supply board, single line. The 800 enclosure is deep enough (400 mm) to take two vertical incomers, a changeover device and a control section behind one door — the arrangement used where the board has to survive the loss of the normal supply.

Key Features

One Platform from 125 A to 800 A SIBOARD 125, 630 and 800 are not three products but three enclosure sizes of one design. Mounting parts, the 18 mm device grid, the kit range and the drawings are shared, so a site that starts with a small lighting board and later needs an 800 A dual‑supply board stays inside the same system, with the same assembly method and the same spare parts.

Type-Tested to IEC 61439 and Verified by VDE SIBOARD is a type‑tested assembly. Temperature rise, dielectric properties, short‑circuit strength, protective‑conductor continuity, mechanical operation and degree of protection are verified by test on the standard assemblies rather than calculated per project, and IP and IK protection is verified as part of the same programme. Every board we ship also passes routine tests — visual and electrical inspection, insulation test and verification of protective‑circuit continuity — before it leaves the workshop.

Fast-Install Kits Cut Assembly Time Devices go onto pre‑assembled kits that locate in the enclosure on a fixed grid: modular DIN‑rail kits in 150 mm and 200 mm heights, horizontal and vertical moulded‑case kits, an isolator kit, mounting plate kits and busbar supports. Because the kits set the positions, assembling several boards — and later extending a live board — takes far less time and demands far less on‑site fabrication.

Free Device Layout Inside Standard Enclosures The enclosure does not dictate the panel schedule. Inside the standard frame you choose which devices go where, and the kits adapt to that arrangement, so a board can follow an unusual circuit list without becoming a one‑off build. The standard schemes on this page are starting points for conventional arrangements.

Up to IP54 with IK10 Impact Protection Enclosure protection runs up to IP54 on the 630 and 800 series, with IP30, IP31D and IP43 options on the 125 series. All series reach IK10 mechanical impact class and safety class I. That covers indoor plant rooms and dusty or damp service areas as well as clean riser cupboards, without changing series.

24 Module Widths on an 18 mm Grid A single row of modular devices carries 24 module widths, with 18 mm to one module width. Two rows give 48 MW and three rows 72 MW in a 600 mm wide enclosure; a 900 mm wide enclosure takes 36 MW per row. Packing density is increased by adding rows, not by ordering a wider cabinet.

Flush, Wall or Floor — Chosen per Room The same series covers a flush‑mounted box in a corridor, a wall‑mounted board in a workshop and a floor‑standing board in a plant room. Mounting form is a selection made from the size matrix, so mixed installations on one project do not mean mixed suppliers or mixed documentation.

Ready for Metering and Communication The modular rows accept measuring devices and data gateways one module width wide, so energy measurement can be added inside the board instead of in a separate enclosure. The same kits accommodate temperature and smoke sensing where a project wants local monitoring of connections and busbars.

Applications

Sub‑distribution boards turn up wherever a building or a plant is divided into areas that need their own protection and their own metering. The 125 to 800 A range covers the usual spread of that work.

Residential, administrative and commercial buildings — floor and riser boards fed from a main incomer
Electronics and manufacturing plants — workshop distribution and machine‑side boards
Municipal works — pumping stations, depots and street‑lighting distribution
Rail and metro infrastructure — station and tunnel sub‑distribution
Healthcare and schools — departmental boards with separate metering
Data centres — rack‑row and room distribution downstream of the main board

Oil, gas and petrochemical sites — distribution in dusty or damp areas
Solar and wind plants — plant auxiliary supply and string‑side distribution
Power generation and transmission — station service boards
Finance and office fit‑outs — tenant boards with sub‑metering
Real estate developments — phased distribution that grows with occupancy
Commercial complexes — retail, catering and services distribution

What We Need to Quote Your Board

Because every SIBOARD board is assembled to the project drawing, a few documents are enough for us to come back with a priced board schedule.

Panel schedule with the outgoing circuit list — device rating and duty for each way
System voltage, frequency and earthing system
Incoming current and the short‑circuit level at the board (Icw / Ipk)
Mounting form (flush, wall or floor) and the space available

Required degree of protection and the environment the board sits in
Cable entry direction and cable type
Metering, indication or communication requirement
Any changeover, interlock or segregation requirement

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

License, Standards & Documentation

Licensed Series	License No.	Issued By	Licensee
SIBOARD	SIBOARD/020726/HQ/SH/CH	Siemens Ltd., China	Gonghong Electric Appliance Co., Ltd.

Type Test and Product Standards

Series	IEC Standard	GB Standard	VDE Certificate No.
SIBOARD 125	IEC 61439-1 / IEC 61439-3	GB 7251.1 / GB 7251.3	40055153
SIBOARD 630 / 800	IEC 61439-1 / IEC 61439-2	GB 7251.1 / GB 7251.12	40055338

License certificate, VDE type‑test certificates and routine test reports are available on request for project qualification. Assembly is carried out under ISO 9001 quality management.

SIBOARD 125, 630 and 800 series low voltage distribution boards — flush‑mounted, wall‑mounted and floor‑standing enclosures manufactured under licence from Siemens Ltd., China — **The complete SIBOARD range.** Flush‑mounted, wall‑mounted and floor‑standing enclosures on one modular platform. We build this range under licence from Siemens Ltd., China, and supply it with approved drawings, the kit list, routine test reports and operating documents.

Every board we ship is assembled in our own factory in Yueqing, Zhejiang — the same site that produces our medium‑voltage switchgear, transformers and prefabricated substations. Sheet‑metal fabrication, enclosure painting, kit assembly, wiring and routine testing all happen in‑house, which is what keeps both the schedule and the quality check inside our control.

Need a licensed SIBOARD board for your project?

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SIEMENS and SIBOARD 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 SIBOARD low voltage distribution board series. Technical data describes the licensed SIBOARD platform; the configuration of a specific board follows the approved panel schedule and the selected devices. Product images are shown for illustration.

SIBOARDLow Voltage Distribution Boards