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Cable Distribution Boxes for Reliable Power Distribution & Custom Cable Management

Medium-voltage (12 kV to 40.5 kV) and low-voltage cable distribution boxes provide reliable power branching, sectioning, and network configuration for municipal grids, industrial plants, and renewable energy installations. Manufactured in accordance with IEC 62271-200 and IEEE standards, these units integrate fully insulated, touch-proof cable terminations with robust, weatherproof enclosures engineered for continuous outdoor operation under severe environmental conditions.

Cable Internet Distribution Box
The Cable Internet Distribution Box is a product from Yuanzhuo Electrical Equipment. We developed it based on European design standards. It has a modular structure with ample internal space.
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Cable Branch Box
The Cable Branch Box from Yuanzhuo Electrical Equipment combines American cable distribution technology with local needs. We built it with years of high-voltage distribution manufacturing experience.
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Electrical Ring Main Unit
The Electrical Ring Main Unit is a compact distribution device from Yuanzhuo Electrical Equipment. We designed it for ring network distribution systems. It combines high-voltage ring switches and...
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Distribution Box Cable
The Distribution Box Cable is a premium product from Yuanzhuo Electrical Equipment. We designed it for high-end, safe, maintenance-free cable branching needs.
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Outdoor Electrical Distribution Box
Our Outdoor Electrical Distribution Box is a weatherproof power distribution solution designed for outdoor end-of-line power and lighting distribution in industrial sites, commercial facilities,...
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Integrated Low Voltage Distribution Box
Our Integrated Low Voltage Distribution Box is a compact, all-in-one outdoor power distribution solution that integrates metering, protection, and distribution functions in a single weatherproof...
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European Style Cable Branch Box
Our European Style Cable Branch Box is a medium-voltage cable connection and branching solution designed for distribution rooms requiring plug-in type cable connections and live-line maintenance...
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American Style Cable Branch Box
Our American Style Cable Branch Box is a compact, aesthetically designed medium-voltage cable connection solution for landscape-sensitive distribution applications. The American-style design...
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Outdoor Ring Main Unit
Our Outdoor Ring Main Unit is a compact, weatherproof medium-voltage switchgear assembly designed for outdoor ring network power distribution in urban and infrastructure applications. The unit...
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Fully Insulated Cable Branch Box
Our Fully Insulated Cable Branch Box is a medium-voltage cable connection solution designed for distribution rooms in humid, corrosive, and contaminated environments where conventional...
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Product Series

European-Style Cable Branch Box
Voltage Rating: 12 kV / 24 kV / 40.5 kV
Rated Current: 630 A
Busbar System: Fully insulated, shielded outer layer, touch-proof design
Key Feature: Utilizes separable T-connectors and elbow connectors. Supports plug-in switch modules (load break switches / SF6 load switches) for flexible circuit protection and expansion.

American-Style Cable Branch Box
Voltage Rating: 15 kV / 25 kV / 35 kV
Rated Current: 200 A (Loadbreak) / 600 A (Deadbreak)
Busbar System: EPDM molded rubber insulation
Key Feature: Compact enclosure footprint with dead-front operation. Ideal for landscape-sensitive areas, commercial complexes, and space-constrained residential installations

SF6 Gas-Insulated Cable Distribution Box (Ring Main Unit Integration)
Voltage Rating: 12 kV to 36 kV
Tank Construction: Stainless steel (Grade 304/316L), robotically laser-welded and sealed for life (IP67 internal gas tank)
Key Feature: Houses 2-way to 6-way load break switches or vacuum circuit breakers within an SF6 gas medium, remaining unaffected by high humidity, ambient pollution, or high-altitude environments.

Solid-Insulated / Fully Shielded Cable Distribution Box
Voltage Rating: 12 kV / 24 kV
Key Feature: Completely SF6-free construction utilizing epoxy resin solid insulation. Eliminates gas leakage risks while delivering total weatherproofing and zero maintenance requirements.

Specifications & Configuration

Medium Voltage (MV) Series
Parameter	Specification
Rated Voltage (Un)	12 kV / 24 kV / 36 kV / 40.5 kV
Rated Current (In)	200 A / 630 A / 1250 A
Short-Time Withstand Current (Icw)	20 kA / 25 kA / 31.5 kA (3 s)
Peak Withstand Current (Ipk)	50 kA / 63 kA / 80 kA
Power Frequency Withstand Voltage	42 kV / 65 kV / 95 kV (1 min)
Lightning Impulse Withstand Voltage (BIL)	75 kV / 125 kV / 185 kV
Enclosure Protection Class	IP54 / IP55 / IP65
Enclosure Material	2.0 mm 304/316 stainless steel, galvanized steel, or SMC composite
Cable Branching Outlets	2-way to 8-way incoming/outgoing feeders
Cable Connector Type	Shielded EPDM / silicone rubber separable connectors (Deadbreak / Loadbreak)
Low Voltage (LV) Series
Parameter	Specification
Rated Voltage (Un)	400 V / 690 V
Rated Current (In)	400 A / 630 A / 1600 A / 2500 A
Short-Time Withstand Current (Icw)	10 kA / 15 kA / 25 kA (1 s)
Peak Withstand Current (Ipk)	22 kA / 30 kA / 52 kA
Power Frequency Withstand Voltage	2.5 kV (1 min)
Lightning Impulse Withstand Voltage (BIL)	N/A
Enclosure Protection Class	IP44 / IP54
Enclosure Material	Galvanized steel with outdoor epoxy powder coating
Cable Branching Outlets	Customizable multi-circuit distribution bars
Cable Connector Type	Cable lugs / busbar clamps

Primary Applications

Urban Underground Grids:

Converts overhead power lines into underground cable networks and handles intermediate junction branching in dense residential and commercial districts.

Infrastructure Projects:

Railway power networks, airport distribution hubs, and port facilities requiring high-ingress protection and reliable continuous duty.

Renewable Energy Generation:

Functions as the primary collector box between solar inverter groups/wind turbines and step-up substations.

Industrial Complexes & Data Centers:

Provides ring network switching, isolated circuit control, and feed branching for critical plant loads.

Customization & OEM Capabilities

Structural Enclosure Customization:

304/316L stainless steel, hot-dip galvanized steel, or heavy-duty Sheet Molding Compound (SMC) enclosures. Colors customized via RAL color codes with anti-graffiti and UV-resistant outdoor coatings.

Electrical Configuration:

Integration of remote terminal units (RTU), fault passage indicators (FPI), live-line indicators, anti-condensation heaters, micro-switch auxiliary contacts, and surge arresters.

Busbar & Termination Layouts:

Adjustable phase centers, front/rear cable access configurations, and custom height cable support brackets matching various cable cross-sections (50 sq mm to 500 sq mm).

Testing & Quality Assurance

Partial Discharge Testing:

Internal gas tanks and solid-insulated components are tested to maintain partial discharge levels below 5 pC at 1.2 Un.

Helium Leak Detection:

Vacuum-chamber mass spectrometer helium leak detection ensures annual SF6 gas leakage rates stay below 0.1%.

High-Voltage Dielectric Test:

Power frequency withstand voltage testing (up to 95 kV) and impulse voltage testing per IEC standards.

Mechanical Operation & Interlock Verification:

2,000-cycle mechanical endurance checks on integrated switches and grounding switches.

Enclosure Protection Validation:

Ingress protection (IP55/IP65) and salt-spray corrosion resistance tests (up to 1,000 hours per ASTM B117).

Packaging, Documentation & Delivery

Export Packaging: Wrapped in VCI anti-rust film, padded with shock-absorbing foam corner protection, and enclosed in heat-treated, fumigated solid wooden crates (IPPC ISPM 15 certified).

Engineering Documentation Package:
Factory Acceptance Test (FAT) Report & Quality Certificates

As-Built Electrical Drawings (CAD / PDF / STEP 3D Models)

Installation, Operation, and Maintenance (IOM) Manual

Component Data Sheets and Material Certificates

Shipping Support: FOB, CIF, DDP terms supported via FCL (Full Container Load) or specialized flat-rack packaging for oversized configurations.

FAQ

Q: What is the difference between European-style and American-style cable distribution boxes?

A: European-style boxes utilize plug-in T-connectors and provide internal space to house switchgear modules (such as load break switches or vacuum circuit breakers) for system sectioning. American-style boxes feature a more compact, dead-front design using 200A loadbreak or 600A deadbreak elbows directly mounted onto bushings without internal switchgear, making them suitable for simple branching where footprint is limited.

Q: Are your cable distribution boxes suitable for coastal or highly corrosive environments?

A: Yes. For coastal or offshore applications, we manufacture enclosures using 304 or 316L stainless steel with a minimum panel thickness of 2.0 mm, finished with marine-grade polyester powder coating. Internal busbars and connection hardware feature tin-plating or nickel-plating to prevent galvanic corrosion and oxidation.

Q: Can your cable branch boxes integrate into automated grid systems (SCADA)?

A: Yes. We offer distribution boxes fitted with Fault Passage Indicators (FPI), current/voltage transformers (CT/VT), motorized operating mechanisms, and Remote Terminal Units (RTUs). These components allow real-time monitoring of current, voltage, and switch status, as well as remote trip/close operation over IEC 60870-5-104 or Modbus protocols.

Q: What types of cable connectors do you supply with the units?

A: We supply fully screened, touch-proof separable connectors manufactured from EPDM or silicone rubber, rated for 200A, 630A, or 1250A. Connectors accept copper or aluminum conductors ranging from 50 sq mm to 500 sq mm and are tested for partial discharge and impulse withstand performance prior to installation.

Q: Do you provide Type Test reports for project tenders?

A: Yes. Our product lines have completed type testing at accredited independent testing laboratories in compliance with IEC 62271-200 and IEC 62271-102 standards. Type test documentation covering short-time withstand current, temperature rise, dielectric insulation, and IP rating is available upon request for tender submissions.

Q: What is the standard lead time for custom OEM orders?

A: Standard production lead time ranges from 3 to 4 weeks following final approval of technical drawings (Single-Line Diagrams and general arrangement drawings). For urgent project requirements or standard stocked configurations, expedited dispatch within 10 to 15 business days can be arranged.

Ready to Request a Quote or Technical Proposal?

To help our engineering team provide an accurate quotation and single-line diagram (SLD) review within 24 hours, please share the following project details with your inquiry:

System Electrical Parameters: Rated voltage (kV), rated current (A), and short-circuit withstand rating (kA/s).

Single-Line Diagram (SLD) / Schematic: Number of incoming/outgoing cable branches and switchgear requirements (Load Break Switches, VCBs, or Fuses).

Enclosure Specifications: Preferred material (304/316L Stainless Steel or SMC), IP rating, and installation environment (indoor/outdoor/coastal).

Accessories Required: Fault Passage Indicators (FPI), Remote Terminal Units (RTU), live-line indicators, or surge arresters.

Project Quantity & Target Delivery Schedule.

Email your drawings directly to our engineering team: [Your Sales Email Address]

We're well-known as one of the leading cable distribution box manufacturers and suppliers in China. We warmly welcome you to wholesale high quality cable distribution box at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.

Distribution Box Cable, Electrical Ring Main Unit, Cable Branch Box