LW45-126(G) Self-Energy Type SF6 Circuit Breaker

The LW45-126(G) Self-Energy Type SF6 Circuit Breaker is an outdoor AC high-voltage switching device designed for 50 Hz transmission and distribution systems. It is used for making and breaking rated current, interrupting fault current, and switching transmission lines, providing protection, control, and operational functions for power systems. It also supports three-phase rapid auto-reclosing operations.

This circuit breaker adopts an advanced design with a simple and compact structure. The three poles are mounted separately on a single crossbeam, which is supported by two ground-installed brackets. The spring operating mechanism is installed centrally beneath the crossbeam and drives all three poles synchronously through linkages and toggle components.

Each pole consists of an arc-extinguishing chamber, support insulator, and toggle box.
Thanks to its compact structure, small size, and lightweight design, the LW45-126(G) breaker can be combined with disconnecting plugs to form a mobile, cart-mounted SF6 breaker, suitable for both indoor and outdoor substations.

The product has successfully passed all type tests in accordance with national standards and IEC standards, demonstrating excellent breaking performance, high insulation reliability, strong current-carrying capability, and long electrical and mechanical service life.

Product Features

◎ Excellent Breaking Performance

• Equipped with a self-energy arc-extinguishing chamber, capable of interrupting terminal faults, near-zone faults, out-of-step conditions, single-phase-to-ground faults, and line charging currents.

• Low arc voltage and minimal electrical wear.

• Capable of 20 consecutive interruptions of rated short-circuit current.

◎ High Insulation Reliability & Strong Current-Carrying Capability

• Uses SF6 gas with superior insulation properties.

• Simple and highly reliable insulation structure.

• Fewer current-carrying components and contact points, ensuring low resistance and high current-carrying strength.

◎ Unique Structural Design

• Simple interrupter structure with fewer parts, lightweight, low operating energy, and high mechanical reliability (mechanical life up to 6,000 operations).

• Symmetrical upper and lower terminal plates accommodate various wiring configurations.

• Optimized insulation design significantly reduces SF6 gas consumption, supporting environmental protection.

• Robust structure with excellent anti-seismic capability.

◎ Easy Installation, Operation & Maintenance

• Factory-assembled and fully tested for quick on-site installation.

• Integrated spring operating mechanism eliminates risks of oil or gas leakage.

• No daily energy storage monitoring requirements.

• Convenient for inspection and maintenance.