FZN25-12 Series Indoor High Voltage Vacuum Load Break Switch

2025-08-04

The FZN25-12 Series is an indoor high-voltage vacuum load break switch designed for 12kV power distribution systems, combining vacuum arc-extinCtion technology with reliable load switching and isolation capabilities to ensure safe and efficient power management in indoor environments.

Core Design & Insulation

Featuring a compact, enclosed structure, the switch utilizes epoxy resin cast insulation for its main circuit components, providing excellent dielectric strength and resistance to humidity and dust (IP3X protection rating). Its modular design integrates the vacuum interruPter, operating mechanism, and isolation contacts in a single unit, optimizing space utilization in switchgear cabinets. Key design highlights include:

Corrosion-resistant metal casing (zinc-plated steel) for long-term durability in indoor industrial environments.

Sealed vacuum interrupter with a hermetic ceramic envelope to maintain stable vacuum integrity (≤10⁻⁴ Pa).

Performance & Vacuum Interruption

Rated Parameters: 12kV rated voltage, 630A continuous current, and 20kA short-time withstand current (1s), suitable for medium-voltage distribution networks.

Vacuum Arc Quenching: Equipped with copper-chromium (CuCr) contacts to achieve fast arc extinction, enabling safe breaking of load currents up to 630A and switching of no-load transformers or cables.

Long Service Life: Electrical life exceeds 3,000 load-breaking operations, while mechanical life reaches 10,000+ cycles, minimizing maintenance and replacement needs.

Operation & Safety

The switch supports both manual and motorized operation, with intuitive controls for seamless switching between positions. Safety features include:

Mechanical and electrical interlocks to prevent misoperation (e.g., closing under load when isolated, opening during short circuits).

Visible isolation gap when in the open position, meeting IEC 62271-102 standards for safe maintenance access.

Optional auxiliary contacts for remote status monitoring, compatible with building management or power control systems.

Application Scope

Ideal for indoor 12kV power distribution scenarios, including:

Industrial plants, manufacturing facilities, and factory power grids.

Commercial buildings, shopping malls, and high-rise complexes.

Data centers and critical infrastructure requiring reliable load management.

Secondary substations and distribution switchgear.

Operational Advantages

Low Maintenance: Vacuum technology eliminates the need for gas or oil refilling, reducing upkeep costs and downtime.

Space-Efficient: Compact footprint fits standard 12kV indoor switchgear cabinets, simplifying installation in limited spaces.

Enhanced Safety: Interlocks and visible isolation gaps ensure operator protection during routine inspections and operations.

Cost-Effective: Combines load breaking and isolation functions in one unit, reducing the need for additional components.