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35KV Medium Voltage Junction Box
35KV Medium Voltage Junction Box
35kV Medium Voltage Junction Box is designed for photovoltaic and wind power systems. It connects power cables with switchgear, substations, or transformers, enabling efficient cable branching, splicing, and transition.
It features a fully sealed, fully insulated, waterproof, and maintenance-free design for safe and reliable operation. Optional components include lightning arresters, short-circuit indicators, and voltage displays.
With a compact structure and flexible installation, it supports multiple connection schemes and performs well in harsh outdoor environments. It is resistant to dust, moisture, flooding, and corrosion, and can operate at temperatures from -30°C to +40°C and altitudes up to 3000 m.
The unit can also function as outdoor ring main switchgear and is compatible with GN27-40.5 isolation switches for secure circuit control.
Key Features:
The 35kV Medium Voltage Junction Box is compact in structure, fully enclosed, and of outdoor type. It adopts plug-in type cable connectors with reliable insulation performance, enabling rapid connection, splitting and interconnection of multiple cables. It features convenient installation, no maintenance requirements, and high protection level. It can effectively simplify the layout of the cable network and is suitable for cable distribution power supply in urban power grids, industrial parks, tunnels and outdoor distribution locations.
Why choose the 35KV Medium Voltage Junction Box
It is ideal for modular connections in urban power grids, offering a compact footprint and high reliability. With IP54 protection, it features a sturdy stainless steel or cold-rolled steel plate enclosure to resist environmental impacts, making it particularly suitable for industrial parks and residential areas.
Product Advantages
Safe and Reliable: Offers full insulation, waterproofing, and maintenance-free performance, ensuring high reliability for personnel safety.
Optional Functional Devices: Can be equipped with lightning arresters, short-circuit indicators, and voltage displays as required.
Compact and Flexible: Small size with a sleek appearance, adaptable installation, and simplified operational transitions.
Flexible Connection Schemes: Supports diverse connection schemes with excellent environmental resilience.
Strong Environmental Adaptability: Resistant to dust, moisture, floods, and corrosion, and operates reliably in temperatures from -30℃ to +40℃ and at altitudes up to 3000 meters.
Innovative and Versatile: Serves as an outdoor ring main switchgear and supports pre-installed substations. It is also compatible with GN27-40.5 isolation switches for secure circuit handling.
Operating Conditions
Temperature: -30°C to +40°C.
Humidity: Maximum daily average relative humidity of 95%.
Altitude: ≤3000m.
Environmental Durability: Resistant to high winds up to 35 m/s and suitable for IV-grade pollution environments.
Application
The 35kV Medium Voltage Junction Box is mainly used in outdoor 35kV cable power distribution lines to achieve the connection, transfer and interconnection of multiple cable circuits. It is widely applied in urban power grid renovations, industrial parks, residential areas, commercial complexes, infrastructure and industrial and mining enterprises, etc. It is particularly suitable for areas with dense cables, limited space and the need for flexible expansion of power distribution circuits. It can simplify cable wiring and enhance power supply reliability.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| 35KV Medium Voltage Junction Box | D: | Cable distribution |
| F: | Outdoor type | |
| W: | Weather-proof | |
| 40.5: | Rated voltage 40.5kV | |
| 630A: | Rated current 630A |
Technical Parameters
| Item | Parameter |
|---|---|
| Model | DFW-40.5/630A, DFW-40.5/1250A |
| Rated Voltage | 40.5kV |
| Maximum Operating Voltage | 42kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A / 1250A |
| Rated Short-Time Withstand Current (3s) | 25kA |
| Rated Peak Withstand Current | 63kA |
| Power Frequency Withstand Voltage (Phase-to-Phase / Phase-to-Ground) | 95kV / 1min |
| Lightning Impulse Withstand Voltage (Peak) | 185kV |
| Degree of Protection | IP54 |
| Ambient Temperature | -40°C to +40°C |
| Altitude | ≤1000m |
| Cable Entry and Exit Method | Bottom entry & bottom exit / side entry & side exit |
| Connection Method | European-style touchable front connector / rear connector |
| Enclosure Material | Powder-coated cold-rolled steel / 304 stainless steel |
| Application | Outdoor cable branching and ring network transfer |
Overall and mounting dimensions(mm)（Reference）
Custom 35 kV Medium Voltage Junction Box Solutions for Your Project
(The values can be customized according to local project requirements.)
If you have specific requirements for the parameters, structure, or configuration of the 35 kV medium voltage junction box, please contact us. Our team of account managers, technical engineers, and product consultants will assess your electrical network design, rated specifications, installation environment, protection and control needs, and project timeline to deliver a tailored solution that meets your application requirements.
We can customize rated voltage (35 kV), rated current capacity, insulation type, enclosure protection grade, terminal layout and bus arrangement, earthing scheme, sealing and weatherproofing level, accessories and monitoring devices, and other key design details to ensure safe, reliable, and durable performance in your medium‑voltage distribution system. A 35 kV medium voltage junction box serves as a crucial connection and transition point in medium voltage networks, providing secure cable termination, grounding, insulation, and protection functions to support power distribution, line branching, and system expansion.
This solution is ideal for outdoor and indoor medium voltage feeder lines, solar and wind farms, utility distribution networks, industrial facilities, substations, and other electrical infrastructure applications where a robust, compact, and customizable junction solution is needed. By tailoring the junction box configuration to your specific project conditions and requirements, we can help ensure optimal electrical connectivity, safety, and long‑term reliability of your medium‑voltage power system.
FAQ
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