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Low Voltage Switchgear Manufacturer & Custom OEM Supplier

Anhui Yanyue Intelligent Technology manufactures factory-assembled low voltage switchgear assemblies and power distribution cabinets (up to 690 V, main busbar up to 6300 A). Engineered to IEC 61439-1/2 standards, each switchgear unit provides primary power distribution, motor control, and circuit protection for industrial plants, commercial infrastructure, and utility substations.

Low voltage switchgear distributes power from transformers or generators to downstream sub-distribution panels and industrial loads. Designed with compartmentalized steel enclosures, the assembly isolates internal faults, prevents accidental contact with live busbars, and allows maintenance on individual functional units.

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Enclosure Architecture & Form Separation

Main Busbar Compartment

Houses high-conductivity electrolytic copper busbars positioned horizontally or vertically, braced with epoxy or unsaturated polyester insulator supports to withstand short-circuit electrodynamic forces.

Equipment / Functional Compartment

Configured with fixed, plug-in, or fully withdrawable (drawer-type) breaker modules. Modular drawers allow unit swapping without de-energizing the entire panel.

Cable Compartment

Features dedicated cable entry channels with adjustable mounting rails, providing space for incoming/outgoing copper or aluminum power cables and control wiring.

Internal Separation (IEC 61439)

Available in Form 2b, Form 3b, and Form 4b internal separation configurations to physically isolate busbars, functional units, and external terminals.

Technical & Safety Standards

Compliance Standards

Manufactured according to IEC 61439-1 (General rules) and IEC 61439-2 (Power switchgear and controlgear assemblies).

Ingress Protection

IP30/IP40 for indoor substation environments; IP54 with gasketing and filtered ventilation for dusty or humid industrial sites.

Corrosion Resistance

Enclosure frames are built from 2.0mm cold-rolled steel or zinc-coated sheet metal, finished with electrostatically applied epoxy-polyester powder coating (thickness >= 80 um) passing 500-hour salt spray testing.

Product Selection

Technical Parameter	Standard Specification Range
Rated Operational Voltage (Ue)	400 V / 415 V / 690 V
Rated Insulation Voltage (Ui)	1000 V
Rated Impulse Withstand Voltage (Uimp)	8 kV / 12 kV
Rated Frequency	50 Hz / 60 Hz
Rated Current - Main Busbar (In)	630 A / 1250 A / 2000 A / 3150 A / 4000 A / 6300 A
Rated Short-Time Withstand Current (Icw)	30 kA / 50 kA / 65 kA / 80 kA / 100 kA (1s)
Rated Peak Withstand Current (Ipk)	63 kA / 105 kA / 143 kA / 176 kA / 220 kA
Assembly Construction Type	Fixed Frame (GGD Type) / Withdrawable Modular (GCS / GCK / MNS Type)
Form of Internal Separation	Form 1 / Form 2b / Form 3b / Form 4a / Form 4b
Degree of Protection	IP30 / IP40 / IP42 / IP54
Enclosure Sheet Thickness	Frame: 2.0 mm; Doors & Covers: 1.5 mm - 2.0 mm

OEM / Custom Configuration

Low voltage switchgear panels are engineered according to customer single-line diagrams, short-circuit calculations, and physical spatial boundaries.

Engineering Process Flow:
(1)Single Line Diagram (SLD) Submission -> (2) Electrical Engineering & Internal Layout Design -> (3) Busbar Capacity & Thermal Rise Calculation -> (4) CNC Sheet Metal Punching & Busbar Bending -> (5) Wiring, Functional Drawer Testing & FAT

Customization Options
Switching & Protection Components: Air Circuit Breakers (ACB), Molded Case Circuit Breakers (MCCB), miniature circuit breakers, and fuse switch disconnectors from Schneider, ABB, Siemens, Chint, or customer-specified brands.

Motor Control Center (MCC) Units: Direct-on-line (DOL) starters, star-delta starters, soft starters, and variable frequency drives (VFD) integrated with local/remote selector switches.

Power Quality & Compensation: Automatic Power Factor Correction (APFC) capacitor banks with detuned reactors for harmonic suppression.

Metering & Automation: Multi-function digital energy meters, RS485/Modbus communication gateways, and PLC/HMI control sections for automated load shedding and monitoring.

Applications

01.

Industrial Manufacturing

Automobile assembly lines, chemical plants, textile mills, and steel works requiring centralized Motor Control Centers (MCC).

02.

Commercial Real Estate & Infrastructure

High-rise commercial buildings, shopping malls, hospitals, and airports requiring reliable main low-voltage distribution.

03.

Data Centers & Telecommunications

Main distribution switchboards integrated with Automatic Transfer Switches (ATS) for uninterrupted dual-power switching.

04.

Utilities & Energy

Step-down power distribution in transformer substations, solar PV inverter stations, and municipal water treatment facilities.

Procurement, Testing & Delivery

Manufacturing Precision & Quality Control
CNC Sheet Metal Processing: Enclosure panels are processed using CNC laser cutting and multi-axis CNC bending machines to guarantee tight frame squareness and seamless door sealing.

Busbar Fabrication: High-purity T2 copper busbars undergo CNC punching, bending, and contact surface tin-plating to ensure low contact resistance (<= 30 uohm at joint connections) and minimal temperature rise. Busbar bolting is tightened using torque wrenches according to DIN 43673 standards and marked with anti-tamper torque seal paint.

Wiring & Interlock Assembly: Secondary control wiring uses flame-retardant copper conductors labeled with heat-shrinkable wire sleeves for clear circuit identification.

Factory Acceptance Testing (FAT)
Every low voltage switchgear assembly undergoes 100% routine testing prior to dispatch:

Power frequency dielectric withstand test (2500V AC for 1 minute on main circuits; 2000V AC on control circuits).

Insulation resistance measurement (>= 10 Mohm at 1000V DC test voltage).

Main circuit resistance verification across breaker contacts and busbar joints.

Mechanical operation test of breaker racking mechanisms, drawer alignment interlocks, and door hinges (minimum 20 insertion cycles per drawer).

Secondary control circuit continuity and protection relay tripping function verification.

Packaging & Transport

High voltage and low voltage cabinets are separately packed in fumigated wooden export cases with independent protection for precision components.

Support EXW factory pickup and FOB designated port shipment.

Export packages are marked with high voltage/low voltage, waterproof, and shockproof labels.

Modular packaging reduces shipping volume and minimizes damage risks during transportation and installation.

Our Certificate

FAQ

Q: How do withdrawable drawer interlocks prevent electrical arcing during insertion or removal?

A: Our withdrawable switchgear features a 3-position mechanical interlock mechanism (Connected, Test, Disconnected). The drawer cannot be racked in or out while the internal circuit breaker is closed. Operating handles are mechanically locked to prevent door opening when the switch is energized.

Q: What temperature control features are used to prevent busbar overheating in high-current panels (above 3150 A)?

A: For high-current incoming panels, we utilize ventilated top louvers, forced-air cooling fans with thermostatic controls, and silver-plated or tin-plated copper busbar joints to minimize contact resistance and heat accumulation.

Q: Can you manufacture switchgear to match our existing site dimensions and specific breaker brands?

A: Yes. Our engineering department accepts your Single-Line Diagram (SLD) and site arrangement drawings, customizing cabinet dimensions, busbar orientations, and specified component brands (e.g., ABB, Schneider, Siemens) before generating 3D models for your sign-off.

Q: What is the difference between Form 2b and Form 4b internal separation?

A: Form 2b separates busbars from functional units, but terminals for external conductors are not separated from functional units. Form 4b provides complete separation between busbars, individual functional units, and the external terminals of each unit, providing maximum safety during maintenance.

Q: How do you protect low voltage switchgear against humid or coastal salt-spray environments?

A: Enclosure sheet metal undergoes multi-stage phosphating pretreatment followed by a minimum 80 um epoxy-polyester powder coating. For harsh coastal sites, we offer stainless steel (304 or 316L) enclosures and anti-condensation space heaters inside each compartment.

Q: What test documentation is delivered with the switchgear?

A: Each panel shipment includes a Factory Acceptance Test (FAT) report, final schematic wiring diagrams, terminal connection drawings, mechanical dimensional layouts, and user manuals for installed breakers and protective relays.

Request a Quote

Submit your project specifications, Single-Line Diagram (SLD), or preferred component brand list (e.g., Schneider, ABB, Siemens) to receive a customized technical proposal and Bill of Materials (BOM) quote within 24 hours.

Email: 15955042303@163.com

Direct Line / WhatsApp: +86 18255095123

Factory Address: Room 307, 3rd Floor, Building B, Entrepreneurship Center, East of Jingsan Road and North of Tianchu Road, Anhui Economic Development Zone, Tianchang City, Anhui Province, China

As one of the leading low voltage switchgear manufacturers and suppliers in China, we specialized in providing high quality customized products to global clients. Please feel free to buy bulk advanced low voltage switchgear for sale here from our factory. Contact us for pricelist.

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