Load Break Switch (LBS) Units
-- Steady & Reliable Manufacturer --
Product Overview
Load Break Switch (LBS) Units are high-performance switching devices designed to "Make" and "Break" circuits under normal load conditions. At DSJ Electrical, our LBS units serve as a cost-effective alternative to circuit breakers in applications where fault-current interruption is not required at every point. We offer Air-Insulated, SF6-Gas, and Vacuum-type LBS units for both indoor and outdoor use. These switches feature integrated "Arc-Quenching" chambers that safely extinguish the electrical arc generated during opening. When paired with HRC (High Rupturing Capacity) fuses, our LBS units provide full-spectrum protection, handling short circuits via the fuse and operational switching via the LBS. Compact, reliable, and featuring a clear "Visible Break" (on some models), DSJ LBS units are the standard choice for Ring Main Units (RMUs) and transformer primary protection.
Electrical Partner
At DSJ, we transform complexity into reliability. With 42+ years of expertise in power distribution systems, our turnkey service integrates every phase – from regulatory compliance to final commissioning – ensuring seamless project execution for global clients. Whether it is the initial design or the final handover, we will strictly control every detail to ensure that the final delivered products perfectly meet your expectations. With us, you can focus on your core business with peace of mind, knowing that your project is in the hands of professional and reliable partners.
Introduction
The Load Break Switch (LBS) Unit line from DSJ Electrical Co., Ltd is the "Workhorse of Distribution." We recognize that not every circuit needs an expensive, complex circuit breaker for daily switching. Our introduction of this series focuses on "Operational Simplicity" and "Arc-Extinguishing Reliability." We utilize high-speed spring-actuated mechanisms to ensure that the contact separation speed is independent of the operator's hand movement.
Innovation at DSJ involves our "Self-Cleaning Contact" design, which wipes away oxidation every time the switch is operated, ensuring low contact resistance and preventing "Hot Spots." We prioritize "Safety Interlocks," ensuring that the door cannot be opened when the switch is closed, and the earthing switch cannot be engaged while the LBS is active. At DSJ, we provide our LBS units in "Fixed" and "Withdrawable" versions, with optional motorized actuators for remote control via SCADA. Choosing our LBS units means choosing a durable, high-cycle switching solution that provides safe, manual control over your power segments. We provide the "Snap-Action" reliability that distribution networks demand.
Applications
- Ring Main Units (RMU): Compact cable switching for city distribution.
- Transformer Primaries: Cost-effective on-load switching and fuse protection.
- Industrial Feeders: Sectionalizing different parts of a factory floor.
- Solar/Wind Arrays: Isolating string inverters or collection busbars.
- Pole-Mounted Switches: Outdoor distribution line sectionalizing.
- Shopping Malls: Safely switching off-power for tenant maintenance.
Specifications
| Technical Category | LBS Unit Detail |
|---|---|
| Rated Voltage | Up to 40.5kV |
| Rated Current | 630A / 1250A |
| Insulation Type | Air / SF6 Gas / Vacuum |
| Mechanical Life | 2,000 to 5,000 Cycles |
| Breaking Capacity | Full Rated Current (On-Load) |
| Fuse Type | DIN Standard HRC Fuses (Optional) |
| Operation | Manual Spring / Motorized |
Why Choose Us
DSJ Electrical is a "Switching Specialist." Our LBS units are known for their "Crisp" mechanical action and superior insulation strength. We provide one of the most compact SF6 units on the market, allowing you to build smaller, more efficient substations without sacrificing safety or performance.
- Q: Can an LBS break a short circuit?
- A: No, an LBS only breaks "Load" current. You must use HRC fuses with it for short-circuit protection.
- Q: Is a "Load Break Switch" the same as an "Isolator"?
- A: No; an LBS can break current, whereas an Isolator/Disconnector can only be opened at zero current.
Advantages
- Cost-Effective: Significant savings over circuit breakers for load switching.
- Compact Size: Ideal for space-constrained modular switchgear.
- High Reliability: Simplified mechanical design leads to fewer failures.
- Fast Arc Clearing: Specialized chambers prevent contact wear.
- Integrated Earthing: Safely grounds the downstream circuit for maintenance.
- Maintenance-Free: Sealed-for-life gas/vacuum models require zero service.
Standards & Certifications
Our LBS units are compliant with IEC 62271-103 and GB 3804. We hold CE and CCC certifications. Every unit undergoes a 100-cycle mechanical test and a primary contact resistance test before leaving the assembly line.
Payment & Shipping
LBS units are compact and can be shipped individually in wooden crates or pre-installed in cubicles. Lead times: 3-5 weeks.
DSJ Story
about DSJ
Building Power, Building Trust
Founded in 1983, DSJ is a leader in China's power distribution equipment. Headquartered in Beijing as the top-selling enterprise, we integrate manufacturing with trade and maintain full in-house capabilities in R&D, production, and sales. This enables efficient fulfillment of custom orders with industry-leading speed.
As a producer of distribution system, transformer, generator and photovoltaic products exceeding Chinese/international standards, DSJ supplies medium/low-voltage electrical equipment, and PV systems. For over four decades, we have delivered high-safety electrical solutions globally to public infrastructure, corporations, and households – achieving the industry's lowest return rate.
Committed to "meeting diverse needs through quality", DSJ leverages expert teams to provide one-stop services: pre-sales consultation & customization, flexible logistics/payment options, and reliable maintenance – ensuring seamless producer-maintainer-customer collaboration.
+86 18513032986 
FLC Center, Chaoyang District, Beijing, China