SH-B Low-Voltage Switch Cabinet
The SH-B low-voltage switch cabinet is manufactured by LYE Technology at our own works in Wenzhou, China, as a power distribution centre, motor control centre, capacitor compensation unit or terminal distribution board. One enclosure family covers all four duties, so a switchroom can be extended or re-rated by adding cubicles.
- Rated insulation voltage: 1000 V AC
- Rated operating voltage: 690 V AC
- Short-time withstand current: 100 kA for 1 s, peak 220 kA
- Main busbar rated current: Up to 6300 A, separation form 1 / 2b / 3b / 4
- Degree of protection: IP30 / IP31 / IP40 / IP42 / IP55
Low-Voltage Switch Cabinet: Key Features & Typical Use
Four Distribution Duties on One Platform
The SH-B cabinet series is a low-voltage power distribution product that has to cover four different jobs: a power distribution centre, a motor control centre, capacitor compensation equipment and terminal power distribution. One enclosure platform replaces the several unrelated products a plant or a building would otherwise need for control, conversion and distribution of electrical energy.Modular Structure, Standardised Components
Every functional compartment follows the same modular system, and the components inside are standardised rather than project-specific. A switchroom can be extended, re-configured or re-rated simply by adding or swapping modules, so a specification written today stays repeatable instead of becoming a one-off design nobody can rebuild.Functional Layout, Smaller Footprint
The functional design keeps cubicle dimensions and the internal arrangement rational, so the main circuit and the auxiliary circuit run short and direct between compartments. The result is a smaller floor area for the same duty, faster installation, easier maintenance access and an upgrade cost that stays under control.Reliability and Safety by Design
Dielectric strength, temperature rise and short-circuit withstand performance come from type testing under IEC 60439-1, IEC 60529 and IEC 60947 rather than from assumption. Compartment separation and door interlocks strengthen protection for the people working on the cabinet and for the equipment itself — which is what matters in a switchroom that stays energised for decades.Low-Voltage Switch Cabinet Specifications & Technical Data
| Parameter | Details |
|---|---|
| Product | SH-B cabinet series switchgear (B cabinet), low-voltage power distribution |
| Rated Insulation Voltage | 1000 V (AC) |
| Rated Operating Voltage | 690 V (AC) |
| Rated Impulse Withstand Voltage | 12 kV |
| Rated Short-Time Withstand Current | 100 kA (1 s) |
| Rated Peak Withstand Current | 220 kA |
| Overvoltage Category | IV |
| Main Busbar Rated Current | Up to 6300 A |
| Separation Form | 1 / 2b / 3b / 4 |
| Degree of Protection | IP30 / IP31 / IP40 / IP42 / IP55 |
| Functional Unit Type | Fixed type, withdrawable type |
| Applicable Standards | IEC 60439-1, IEC 60529, IEC 60947 |
| Shell / Ventilation Baffle Colour | RAL 9002 shell and RAL 7016 ventilation baffle as standard, both customisable |
| Typical Duties | Power distribution centre, motor control centre, capacitor compensation, terminal power distribution |
SH-B Series — the Low-Voltage Switchgear Cabinet Behind Heavy-Duty Distribution
The SH-B cabinet series is engineered for the point in an installation where the incoming supply has to be split, protected and metered. Rated for 1000 V insulation and 690 V operation, with a main busbar current up to 6300 A and a 100 kA short-time withstand current, it takes the fault levels and the continuous loads that a plant substation, a water treatment works or an airport terminal actually present.Tender documents describe this equipment as an LV switchgear cabinet, a low-voltage distribution board or an LV panel board, and the SH-B is quoted against all three descriptions. Manufacturers differ mainly in frame rigidity, busbar class and compartment separation, so when you compare suppliers ask for the short-time withstand current, the separation form and the type-test certificates. LYE manufactures the SH-B in Wenzhou on our own factory lines, and our sales engineers quote from your single-line diagram.An SH-B cubicle is recognisable by four details we hold constant across the series: the ventilation baffle is finished in RAL 7016, the identification labels align with the position of the functional unit door handle, the sheet-metal shell is RAL 9002 and can be re-coloured to the customer's own RAL value, and the door lock colour always matches the labels and the ventilation baffle. Those rules are why a line of SH-B cubicles still reads as one installation after ten years of extensions by different contractors.Typical applications are exactly the ones the series was sized for: power plants and substations, industrial and mining enterprises, civil building infrastructure, water treatment, and ports and airports. As the manufacturer, LYE supplies the SH-B cabinet with factory-direct pricing, project-specific busbar and separation arrangements, and OEM shell colouring and marking on request.
Factory-Direct Low-Voltage Switch Cabinet Manufacturer & OEM / ODM
We Manufacture, You Brand
LYE Technology (Zhejiang) Co., Ltd. is a national high-tech enterprise in Wenzhou: sheet-metal fabrication, welding, powder coating, busbar machining and final assembly run on our own lines, and every cubicle is function-tested before it leaves the works. The shell that reaches your site carries the type 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, OHSAS18001, CCC, CE and TUV certification. Beyond the standard RAL 9002 shell, we support project-specific colours, laser-marked logos, retail and project packaging, and busbar or separation arrangements built around your single-line diagram.- OEM branding — custom RAL shell colours, laser marking and your own project or retail packaging.
- ODM options — busbar ratings, separation forms and functional unit layouts built around your single-line diagram.
- Certification — ISO9001, ISO14001, OHSAS18001, CCC, CE and TUV, with type-test documents supplied per project.
- MOQ — flexible quantities for a project or a trial order, with mixed cubicle types welcome in one shipment.
Final assembly line — SH-B cubicles in line before routine testing.
Companion range — withdrawable functional units with accessible busbar compartment.
Low-Voltage Switch Cabinet Buying Guide from the Manufacturer
Ordering an SH-B cabinet is straightforward — the checklist below mirrors what our sales engineers will confirm with you anyway.
- Confirm the duty: power distribution centre, motor control centre, capacitor compensation or terminal power distribution.
- Fix the electrical parameters: 1000 V insulation, 690 V operating voltage, 100 kA short-time withstand, 6300 A main busbar.
- Choose the separation form (1 / 2b / 3b / 4), the degree of protection (IP30 / 31 / 40 / 42 / 55) and the functional unit type — fixed or withdrawable.
- Send the single-line diagram, the cubicle schedule, the quantity and the required RAL colour for the shell.
- Approve the shop drawings and a colour sample before mass production.
- Production with routine testing on every cubicle, plus type-test documentation for the project.
- Final inspection, packing and shipment — dispatch directly from the factory on your preferred trade terms.
Manufacturer & Sales Support for Wholesale Buyers
OEM / ODM
Learn more →Shell colours · Logo marking · Custom busbar
Wholesale
Learn more →Factory pricing · Flexible MOQ · Global shipping
Distributor Support
Learn more →Account manager · Drawing support · Priority lead times
Ready to Specify the SH-B Cabinet?
OEM/ODM, wholesale pricing and distributor support — one enquiry gets you a factory-direct quotation for the SH-B cabinet series, sized to your single-line diagram, with type-test documentation under IEC 60439-1, IEC 60529 and IEC 60947.Contact Our Sales TeamLow-Voltage Switch Cabinet — Frequently Asked Questions
What is a low-voltage switch cabinet?
It is the enclosure where an incoming low-voltage supply is split, protected and metered before it feeds the rest of a plant or building. It houses circuit breakers, busbars, metering and control devices and is rated for the fault level the installation presents. The SH-B is rated 1000 V AC insulation and 690 V AC operating voltage with a 220 kA peak withstand current.What is the SH-B cabinet series used for?
It is used as a power distribution centre, a motor control centre, capacitor compensation equipment and terminal distribution. Typical installations are power plants and substations, industrial and mining enterprises, water treatment works, civil building infrastructure, ports and airports, wherever an incoming supply has to be split and protected.What is the difference between separation forms 1, 2b, 3b and 4?
The separation form describes how far the busbar and the functional units are compartmentalised from each other. Form 1 has no internal separation; forms 2b and 3b progressively separate the busbar from the functional units and from outgoing terminals; form 4 separates the busbar, the functional units and their terminals from each other. Higher forms contain a fault more tightly and allow work on one compartment while others stay live.Who manufactures the SH-B low-voltage switch cabinet?
The platform names in this category are built by many factories, so the same description can hide quite different equipment. Ask whether the frame, busbars and powder coating are produced in house, whether type tests cover arc fault and seismic performance, and which certification the factory holds. LYE manufactures the SH-B in Wenzhou as a national high-tech enterprise with ISO9001, ISO14001, ISO45001, CCC, CE and TUV certification.How much does an SH-B low-voltage switch cabinet cost?
Indicative factory-direct pricing is roughly US$1,500 to US$6,000 per cubicle, depending on the busbar rating, the functional unit type, the degree of protection and the quantity ordered. A single trial cubicle and a multi-cubicle switchboard are quoted differently because tooling and testing effort are spread over fewer or more units, so send the single-line diagram for a specific figure.The SH-B low-voltage switch cabinet is manufactured by LYE Technology at our own works in Wenzhou, China, as a power distribution centre, motor control centre, capacitor compensation unit or terminal distribution board. One enclosure family covers all four duties, so a switchroom can be extended or re-rated by adding cubicles.Rated insulation voltage: 1000 V ACRated operating voltage: 690 V ACShort-time withstand current: 100 kA for 1 s, peak 220 kAMain busbar rated current: Up to 6300 A, separation form 1 / 2b / 3b / 4Degree of protection: IP30 / IP31 / IP40 / IP42 / IP55
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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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