HJ-VCB Series Indoor Vacuum Circuit Breaker
Up to 40.5kV / Embedded Pole Tech / Magnetic Actuator
The HJ-VCB Series Indoor Vacuum Circuit Breaker is the ultra-reliable “heart” of medium-voltage power distribution. Designed to seamlessly integrate into metal-clad switchgear, this comprehensive series offers cutting-edge technologies including Embedded Poles (solid-sealed), Permanent Magnetic Actuators, and highly compact lateral-mounted designs. It delivers unparalleled short-circuit breaking capabilities and a virtually maintenance-free lifespan for the world’s most demanding grids.
Ideal for Switchgear Integration & Heavy Loads:
- ✓ Primary Substations & Power Generation Plants
- ✓ Metal-Clad Switchgear OEMs (KYN28 / KYN61 compatible)
- ✓ High-Frequency Operation Facilities (Furnaces, Railways)
- ✓ Extreme Humidity or Highly Polluted Industrial Sites
1. Advanced Embedded Pole Technology (EP)
For extreme environmental resilience, our premium models utilize APG (Automatic Pressure Gelation) technology to cast the vacuum interrupter directly into an epoxy resin cylinder. This "Solid-Sealed" architecture completely protects the interrupter from dust, condensation, and external impacts, vastly reducing maintenance requirements and ensuring absolute dielectric strength.
2. Permanent Magnetic Actuator (High Frequency)
Standard VCBs utilize motor-charged spring mechanisms, which are highly reliable. However, for applications requiring extremely frequent switching, our Magnetic Actuator variant provides a revolutionary upgrade. By drastically reducing moving parts, it achieves an ultra-fast response and extends the mechanical endurance to an astonishing 100,000 operations without traditional wear and tear.
3. Versatile Mounting: Withdrawable, Fixed & Lateral
We provide unmatched flexibility for switchgear designers. Choose from standard withdrawable handcarts for quick maintenance, robust fixed-mounted types for stable installations, or specialized Lateral (Side-Mounted) VCBs. The lateral design significantly reduces panel depth, making it the perfect solution for compact substations and ring main units (RMU).
4. Full Spectrum 12kV to 40.5kV Coverage
From standard 12kV and 24kV distribution nodes to heavy-duty 40.5kV primary substations, the HJ-VCB series scales with your project. The 40.5kV high-clearance models are engineered with superior thermal capacity and robust insulation barriers, confidently handling massive fault currents up to 31.5kA in critical utility networks.
Global Factory Acceptance & Turnkey Support
Every HJ-VCB unit undergoes rigorous factory testing, including X-ray inspections for embedded poles, mechanical run-in tests, and precise contact resistance measurements. We supply fully interchangeable breaker trucks with standardized interlocking pin-outs, ensuring flawless plug-and-play integration for global switchgear manufacturers and EPCs.
Model Selection Matrix
* The matrix below maps our comprehensive indoor VCB series. Detailed dimensional drawings, pin-out diagrams, and custom current ratings are available upon OEM/EPC request.
| Global Series | Rated Voltage | Pole Technology | Operating Mechanism | Key Feature / Application |
|---|---|---|---|---|
| HJ-VCB-12/24 | 12kV / 24kV | Assembled Insulating Cylinder | Spring Mechanism | Standard reliable distribution |
| HJ-VCB-12E (Embedded) | 12kV | Embedded Pole (Solid-Sealed) | Spring Mechanism | Harsh environments, Anti-condensation |
| HJ-VCB-12L (Lateral) | 12kV | Assembled / Embedded | Spring Mechanism | Side-mounted for compact RMU panels |
| HJ-VCB-12M (Magnetic) | 12kV | Embedded Pole (Solid-Sealed) | Permanent Magnetic Actuator | High-frequency switching (>100k cycles) |
| HJ-VCB-40 Series | 40.5kV | Assembled Insulating Cylinder | Heavy-Duty Spring | Primary substations, Large fault currents |
General Electrical Ratings
- Rated Main Current: 630A / 1250A / 2000A / 3150A (Up to 4000A with forced cooling).
- Rated Short-Circuit Breaking Current: 20kA / 25kA / 31.5kA / 40kA / 50kA.
- Mechanical Endurance: 20,000 to 30,000 operations (Spring) / 100,000 operations (Magnetic).
- Installation Options: Withdrawable Handcart (matches KYN switchgear) or Fixed Installation.
Related products
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
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
HJ-OSS Series Outdoor Switching Station
Up to 24kV / No Civil Works / 100% In-House Components
The HJ-OSS Series Outdoor Switching Station is an advanced, fully enclosed intelligent power distribution hub designed to replace traditional brick-and-mortar substations. Engineered with 100% HJATIS proprietary medium-voltage components, it offers unmatched quality control and limitless customization. Featuring a highly compact, moisture-proof stainless steel enclosure, it delivers turnkey SCADA-ready power routing for modern urban and industrial grids. Ideal for Rapid Urban & Industrial Grid Deployment:- ✓ Urban Underground Cable Networks & Street Hubs
- ✓ Large Residential Complexes & Commercial Centers
- ✓ Industrial Parks requiring multi-way power branching
- ✓ Smart Grid Upgrades (Automated Fault Isolation)
HJ-OVCB Series Outdoor Vacuum Circuit Breaker
12kV to 40.5kV / Spring & Magnetic Actuator / IP65+
The HJ-OVCB Series Outdoor Vacuum Circuit Breaker delivers full-spectrum coverage for every outdoor switching requirement. From highly compact 12kV pole-mounted units to heavy-duty 40.5kV outdoor substation breakers, this series integrates advanced actuation technologies and premium weatherproof insulation. It provides the ultimate reliable foundation for auto-reclosing (ACR), fault isolation, and smart grid automation in extreme environments. Ideal for Overhead Distribution & Substations:- ✓ Standard Pole-Mounted Switching & Sectionalizing
- ✓ Smart Grid Auto-Recloser (ACR) Integration
- ✓ Boundary "Watchdog" & High-Frequency Nodes
- ✓ Rural Grid Upgrades & 33/36kV Outdoor Substations