HJ-OFP-S Series Cable Branch Box (with Load Break Switch)
Up to 24kV / Integrated SF6 LBS / Fully Insulated Hub
The HJ-OFP-S Series Cable Branch Box is an advanced outdoor medium-voltage distribution node equipped with an integrated SF6 Load Break Switch (LBS). Unlike passive feeder pillars, it provides active load switching and precise fault isolation capabilities for underground cable networks. Manufactured with 100% HJATIS proprietary enclosures and cable connectors, it guarantees unparalleled cost-efficiency, absolute weather protection, and SCADA-ready intelligence for modern ring main grids.
Ideal for Active Underground Grid Management:
- ✓ High-Density Urban Ring Main Power Networks
- ✓ Industrial Parks requiring active load sectioning
- ✓ Renewable Energy (Wind/Solar) Collection Nodes
- ✓ Railway, Airport & Critical Public Infrastructure
1. Active Load Switching & Fault Isolation
Empower your grid with active control. The integrated SF6 Load Break Switch allows operators to safely make and break rated load currents (up to 630A) and cable charging currents. In the event of a downstream fault, the affected branch can be instantly isolated without shutting down the entire main ring network, drastically minimizing outage areas.
2. 100% Dead-Front & Fully Sealed Architecture
Engineered for zero-maintenance in extreme environments. The core switching components are hermetically sealed inside an SF6 gas tank, while the external connections utilize touch-safe, fully insulated shielded cable connectors (available in 200A and 600A/630A). This design provides absolute immunity against flooding, heavy condensation, and severe coastal pollution.
3. Highly Flexible Multi-Branch Topologies
Design your cable routing without constraints. Leveraging HJATIS's in-house manufacturing capabilities, we offer highly customized incoming and outgoing configurations. From standard 1-in/2-out setups to complex 2-in/4-out or 6-way branch combinations, the HJ-OFP-S perfectly adapts to any complex localized distribution requirement.
4. Automation-Compatible Enclosure & Safety
Designed with future upgrades in mind, the branch box features reserved compartments and mounting provisions to easily accommodate third-party fault indicators or terminal units if required by your EPC design. Furthermore, it incorporates robust mechanical program interlocks, ensuring that earthing and switching operations always follow foolproof safety sequences.
Global Factory Acceptance & Turnkey Delivery
Every HJ-OFP-S unit is rigorously tested in our facility, verifying SF6 gas tightness, dielectric withstand limits, and mechanical interlock reliability. The units are delivered as completely built systems, pre-fitted with our proprietary premium cable connectors and fault indicators, ensuring rapid and secure on-site splicing.
Technical Specifications
(Note: Parameters cover standard 12kV configurations based on the DFW series. Custom 24kV models and specific branching dimensions are engineered upon EPC request.)
| System & Power Parameters | |
| Rated Voltage (Ur) | 12kV (24kV available upon request) |
|---|---|
| Rated Current | 630A (Main & Branch) |
| Rated Active Load Breaking Current | 630A |
| Rated Closed-Loop Breaking Current | 630A |
| Cable Charging Breaking Current | 45A |
| Withstand & Protection Ratings | |
| Short-Time Withstand Current | 20kA (4s) |
| Peak Withstand Current / Short-Circuit Making | 50kA |
| Power Frequency Withstand Voltage (1 min) | 42kV (Phase-to-Phase/Ground) / 48kV (Across open contacts) |
| Lightning Impulse Withstand (BIL) | 75kV (Phase-to-Phase/Ground) / 85kV (Across open contacts) |
| Mechanical Endurance (LBS) | 5,000 Operations |
| Standard Branching Configurations | 1-in 1-out, 1-in 2-out, 2-in 2-out, 2-in 4-out, up to 6-way |
| Enclosure Protection Degree | IP54 (Outer Enclosure) / IP67 (Internal Gas Tank) |
Operating Environment
- Ambient Temperature: -40°C to +45°C.
- Altitude: Standard ≤ 2000m.
- Environmental Resilience: Fully operational under heavy rain, 100% humidity, and extreme dust conditions.
- Installation Site: Outdoor concrete pads, roadside green belts, or industrial yards.
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