Fixed Type Vacuum Circuit Breaker

Our circuit breaker's arc-extinguishing chamber utilizes highly conductive copper-chromium alloy contacts, offering superior arc resistance and abrasion resistance. It boasts a rated short-circuit breaking current of 31.5kA, an electrical life of up to 3,000 operations, and a mechanical life exceeding 10,000 operations-far surpassing the industry average.

The contacts are sealed within a vacuum arc-extinguishing chamber, effectively preventing oxidation and corrosion. Combined with Class F high-temperature insulation, this device operates reliably even under prolonged high loads, effectively extending its service life and reducing replacement costs.

This product is specifically designed for KYN28-12 withdrawable and fixed switchgear, with dimensions precisely matched to the installation space of the switchgear. It uses standardized copper strip interfaces for direct busbar connection without any modifications to the cabinet structure.

It supports both fixed direct installation and conversion from a chassis vehicle into a handcart unit, flexibly meeting various installation needs. It is an ideal choice for upgrading and retrofitting existing power distribution systems, significantly reducing on-site construction and rework costs.

Poor ventilation in distribution rooms often leads to mechanism jamming and degraded insulation performance, making heat dissipation a critical reliability concern for buyers.
Kechang Electric has optimized the housing's heat dissipation structure with a natural air-cooled design and built-in directional ventilation channels to accelerate internal heat circulation and dissipation, ensuring stable operation within an ambient temperature range of -25℃～40℃.
Key insulation components are encapsulated with F1-grade flame-retardant epoxy resin (heat-resistant up to 155℃), preventing high-temperature aging and failure. This makes the product highly reliable for enclosed, high-temperature distribution room environments.

Sudden short-circuit faults require extremely high arc extinguishing capabilities, and buyers need equipment to quickly cut off the faults to protect the back-end system.The arc extinguishing chamber of the product adopts longitudinal magnetic field arc extinguishing technology, which can quickly extinguish the arc, and the breaking time is ≤60ms, which effectively limits the short-circuit current impact.With the optimized contact structure, there is no risk of re-ignition after disconnection, and the short-circuit closing current reaches 80kA, which can withstand instantaneous short-circuit shocks, provide reliable protection for back-end transformers, cables and other equipment, and reduce the loss of failure expansion.