HJ-ILBS Series Indoor Load Break Switch
Up to 24kV / Vacuum & SF6 Options / Switch-Fuse Combination
The HJ-ILBS Series Indoor Load Break Switch provides robust, cost-effective switching and transformer protection for medium-voltage distribution networks. Engineered to safely make and break load currents, closed-loop currents, and cable charging currents, this series offers both eco-friendly Vacuum and highly compact SF6 gas insulation options. When paired with high-voltage current-limiting fuses (Combination Unit), it becomes the ultimate protective safeguard for downstream transformers.
Ideal for Secondary Distribution & OEMs:
- ✓ Ring Main Units (RMU) & Compact Substations (CSS)
- ✓ Switchgear OEMs & Panel Builders
- ✓ Transformer Protection in Commercial & Industrial Grids
- ✓ Wind & Solar Power Collection Nodes
1. Versatile Dielectric Options: Vacuum or SF6
Match your specific grid requirements. We offer Vacuum Load Break Switches (e.g., HJ-ILBS-V series) which are entirely oil-free, gas-free, and environmentally friendly, offering exceptional electrical endurance. For applications requiring ultra-compact footprints, our SF6 Gas Insulated Switches (HJ-ILBS-S series) deliver outstanding dielectric strength and often integrate a 3-position mechanism (Close, Open, Earth) in a single sealed enclosure.
2. Reliable Switch-Fuse Combination
The ultimate cost-effective alternative to a full Circuit Breaker for transformer protection. The HJ-ILBS Combination Unit pairs the load break switch with high-rupturing-capacity (HRC) fuses. Upon a short circuit, the fuse blows rapidly, and its striker pin instantly triggers the mechanical linkage to trip all three phases of the load switch simultaneously, preventing dangerous single-phase operation.
3. Flexible Mounting: Fixed & Withdrawable
Designed for seamless integration by Switchgear OEMs. While standard RMUs utilize our compact Fixed-Mounted units, we also offer premium Withdrawable (Handcart) Configurations. These withdrawable LBS units can be easily racked into metal-clad switchgear, providing high-capacity load switching with the added benefit of rapid maintenance and distinct isolation positions.
4. Integrated Earthing Switch & Interlocks
Operator safety is engineered into the frame. Most models come with an integrated, quick-make earthing switch. A robust mechanical interlocking system ensures that the earthing switch can only be closed when the main load switch is strictly open, fully complying with IEC "5-Prevention" safety mandates.
Global Factory Acceptance & OEM Support
As a trusted partner to global switchgear manufacturers, every HJ-ILBS unit undergoes rigorous mechanical endurance cycling, dielectric testing, and fuse-linkage tripping verification. We supply these switches with comprehensive dimensional drawings, customized operating mechanisms (manual or motorized), and tailored phase-to-phase distances to perfectly fit your cabinet designs.
Model Selection Matrix
* The matrix below maps our comprehensive LBS series. Detailed CAD drawings and motorized operation options are available upon OEM request.
| Global Series | Insulation Medium | Installation Type | Configuration Options | Key Engineering Feature |
|---|---|---|---|---|
| HJ-ILBS-V Series | Vacuum (Air gap) | Fixed Mounted | Pure LBS / Switch-Fuse Combo | Eco-friendly, High electrical life, Transparent insulation covers |
| HJ-ILBS-VW Series | Vacuum (Air gap) | Withdrawable (Handcart) | Pure LBS / Switch-Fuse Combo | Matches metal-clad switchgear tracks, Rapid maintenance |
| HJ-ILBS-S Series | SF6 Gas (Sealed Tank) | Fixed Mounted | Pure LBS / Switch-Fuse Combo | Ultra-compact, Built-in 3-position (Close/Open/Earth) mechanism |
General Electrical Ratings
- Rated Voltage (Ur): 12kV / 24kV (Depends on specific model selection).
- Rated Current (Pure LBS): 630A / 1250A.
- Rated Current (Combination Unit): Max 125A / 200A (Determined by transformer size and matched fuse link).
- Rated Short-Circuit Breaking Current (Combination Unit): Up to 31.5kA (Reliant on HRC fuse capability).
- Mechanical Endurance: Main switch ≥ 10,000 cycles ; Earthing switch ≥ 2,000 cycles.
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