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A cable branch box with SF6 load break switching for safer cable tapping, sectionalizing and power distribution.
Designed for electrical distribution systems that require stable operation, clear circuit protection, and practical installation for industrial, commercial, utility, and infrastructure projects.
Dongfang Electric Power (Shandong) Co., Ltd. supports product selection by voltage level, rated current, installation environment, cabinet structure, cable connection method, and project documentation needs.
Cable Branch Box with SF6 Load Break Switch
Product Overview
The ring-network type cable branch box with SF6 load break switch is composed by connecting the SF6 load switch with related cable connector accessories. It can directly interrupt load current and improve power supply reliability. The enclosure is made of high-quality steel plate with scientific air inlet and outlet design, providing good heat insulation and ventilation. The SF6 load switch uses SF6 gas as arc-extinguishing and insulating medium, with contacts sealed in a reinforced epoxy-resin shell filled with SF6. Touchable shielded synthetic-rubber cable incoming and outgoing lines are connected through cable connectors to integrated bushing seats or special busbars. Inside the box, cross connectors and T-connectors can realize fully insulated and fully sealed connection with the SF6 load switch. The product is suitable for cable connection, branching, power transfer and distribution in cable networks, and offers maintenance-free operation, corrosion resistance, compact size, safety, reliability, compact structure, simple installation and flexible operation.
Functions and Features
| Feature 1 | One or more SF6 load switches can be installed on each line, replacing part of the ring main unit and reducing project cost. |
|---|---|
| Feature 2 | The three-position SF6 load switch with rotary arc chamber can isolate partial outage faults and reduce the impact of outage. |
| Feature 3 | A five-prevention interlock is arranged between the switch and enclosure; incoming and outgoing cable headers are equipped with high-voltage live display devices for safe inspection and operation. |
| Feature 4 | Fully insulated, fully sealed, compact, maintenance-free, dustproof, flood-resistant and corrosion-resistant, suitable for harsh environments. |
| Feature 5 | Full-shield cable connector requires no insulation distance and ensures personal safety. |
| Feature 6 | Flexible incoming and outgoing arrangements meet multiple outgoing line requirements. |
| Feature 7 | Front-door design with external mechanical lock. |
Main Application
This product is mainly used at cable connection points in ring-network systems and general radial systems with rated frequency of 50Hz and voltage of 12kV for distributing electric power. It is widely used in distribution networks of urban industrial parks, residential communities, commercial centers, mining areas, steel, automotive, petroleum, chemical and cement enterprises. It is especially suitable for urban cable grid reconstruction, greatly saving equipment and cable investment while improving power supply reliability.
Model Description
| DF W | High-voltage cable branch box for outdoor installation |
|---|---|
| 12K | Rated voltage and SF6 load switch structure |
| 630 | Rated current |
| Incoming / Outgoing Circuits | Number of incoming and outgoing circuits |
| B | With lightning arrester |
Main Technical Parameters
| Branch Box Technical Index | Parameter | SF6 Load Switch Technical Index | Parameter |
|---|---|---|---|
| Rated Voltage | 12kV | Rated Breaking Current | 630A |
| Rated Current | 630A | Rated Open-Loop Current | 45A |
| Power-Frequency Withstand Voltage | 42kV / 1min | Rated Cable-Charging Breaking Current | 16A |
| Impulse Withstand Voltage | 75kV | Rated Thermal Stability Current | 20kA / 3s |
| DC Withstand Voltage | 52V / 15kV | Stable Thermal Stability Current | 50kA |
| Partial Discharge | Not more than 10pc / 15kV | Rated Making Current | 50kA |
| Rated Thermal Stability Current | 20kA / 3s | Rated Charging Pressure at 20C | 0.045MPa |
| Rated Dynamic Stability Current | 50kA / 0.3s | Load Switch Mechanical Life | 5000 operations |
| Loop Resistance | Not more than 200 micro-ohm | Earthing Switch Mechanical Life | 1000 operations |
| Protection Grade | IP33 | 630A Operation Times | Less than 500 operations |
Products are selected for reliable distribution, protection, switching, and control in practical power systems.
Equipment can be matched to voltage level, capacity, cabinet structure, cable entry, and installation environment.
Technical documents, drawings, labels, packing, and delivery requirements can be coordinated for project use.
Dongfang Electric Power (Shandong) Co., Ltd. focuses on project-oriented power distribution equipment, including distribution boxes, distribution cabinets, withdrawable switchgear, ring main units, cable branch boxes, compensation cabinets, metering systems, busway systems, and power cables.
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