DFW-40.5 Cable Branch Box

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DFW-40.5 Cable Branch Box

DFW-40.5 Cable Branch Box

The DFW-40.5 Cable Branch Box is a medium-to-high voltage outdoor power distribution unit designed for 35kV (nominal voltage 40.5kV) cable networks. It serves as a key component in electrical distribution systems, facilitating the connection, branching, and sectionalizing of underground cables. The equipment is mainly used in three-phase AC power networks and is engineered to ensure safe, reliable operation in a variety of outdoor environments. 

Product Advantages
Flexible Network Configuration
Supports multiple cable entry and exit terminals for easy connection of various network types.Accommodates radial, looped, and hybrid power distribution structures for adaptability.

High Operational Safety
Fully insulated and enclosed structure reduces the risk of accidental contact with live parts.Grounding, interlocking, and surge protection systems enhance safety for both personnel and equipment.


Product Features
Durable Enclosure Structure
Outer housing is typically constructed from stainless steel or coated aluminum alloy.Resistant to corrosion, UV exposure, and impact from external forces.

Multi-Terminal Connection Design
Supports configurations with 2 to 6 or more cable terminals depending on user requirements.Uses elbow-type plug-in connectors or other standardized interfaces for easy installation.

Sealed and Weatherproof Construction
Enclosure rated at IP65 or higher, offering protection against dust, moisture, and water ingress.Suitable for various climates, including humid, coastal, or dusty environments.

DFW/①-40.5/②  口/③ 630/④-口/⑤

High voltage cable branch box (with switch)
Rated voltage
R: With fuse; RD: With fuse and grounding switch 
Rated current 
Number of incoming and outgoing circuit

◇Environmental temperature: -10 ℃~+45 ℃, maximum daily temperature difference of 30 ℃;
◇Wind speed: maximum 35m/s; 
◇Sunlight: 0.1W/cm2,0.5m/s; 
◇Relative humidity: The daily average maximum is 95%, and the monthly average maximum is 90% (25 ℃); 
◇Types and levels of pollution: Level IV; 
◇Ice thickness: 0-30mm; 
Note: When ordering this product beyond the above conditions, please consult with our company.

◇GB3906-2006 3.6kV-40.5kV AC Metal Enclosed Switchgear and Control Equipment GB/T 4208-2008 Degrees of Protection Provided by Enclosures (IP Code)
◇GB/T 11022-1999 Common technical requirements for high-voltage switchgear and control equipment standards (IEC 60298:1996)
◇GB/T 16927.1-1997 High Voltage Testing Techniques Part 1: General Tests (IEC60060-1:1989)
◇GB/T 16927.2-1997 High Voltage Testing Techniques Part 2: Measurement Systems (IEC 60060-2:1994)
◇GB311.1-1997 Insulation Coordination for High Voltage Transmission and Transformation Equipment ◇DL/T404-2005 Technical Conditions for Ordering Indoor AC High Voltage Switchgear
◇DL/T593-2005 Technical Guidelines for Common Ordering of High Voltage Switchgear 
◇SDGJ14-1986 Technical Regulations for the Selection and Design of Conductors and Electrical Appliances

Name Unit Parameter
Branch box Rated voltage KV 35
Rated frequency Hz 50
Rated current A 630
Rated insulation level KV 40.5
Rated short-term power frequency withstand voltage(effective value) KV 117
Rated lightning impulse withstand voltage(peak) KV 200
Protection grade / ≥ IP54
Cable accessories Impulse withstand voltage 200kV,with 10 positive and 10 negative polarities,without breakdown or flashover
DC withstand voltage 104kV(negative polarity),15min,no breakdown,no flashover
Partial discharge 45kV discharge capacity s 10pc
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