FZN25-12 Indoor Medium Voltage Vacuum Load Break Switch – Efficient & Maintenance-Free Power Isolation

Built for modern indoor power distribution systems, the FZN25-12 Indoor Medium Voltage Vacuum Load Break Switch offers a robust and compact solution for safely connecting and disconnecting load currents in 12kV, 50/60Hz AC networks. Commonly deployed in ring main units (RMUs), pad-mounted substations, and industrial switchgear, it ensures reliable operation under normal load conditions while providing clear visual isolation for enhanced safety.

Unlike traditional air or oil-insulated switches, the FZN25-12 leverages sealed **vacuum interrupter technology**, eliminating oxidation, contamination, and maintenance concerns. This design delivers consistent performance over its service life—even in harsh or space-limited indoor environments—while supporting thousands of switching cycles with minimal degradation.

• Compact 12kV vacuum isolating switch – ideal for tight-installation RMUs and urban substations requiring high dielectric strength in minimal footprint

• Indoor-rated medium voltage disconnector – engineered for safe, visible break indication and operator protection in enclosed metal-clad panels

• Maintenance-free load switching device – reduces lifecycle costs with sealed vacuum chambers and no need for gas refills or contact cleaning

The switch complies with IEC 62271 and GB standards, featuring a rated short-circuit making current up to **50kA peak** and a 1-minute power frequency withstand voltage of **42kV**. Optional integration with earthing switches and position indicators further enhances operational safety and system monitoring capabilities.

Whether used for feeder segmentation, transformer protection, or renewable energy interconnection, the FZN25-12 combines simplicity, reliability, and advanced vacuum insulation—making it a smart choice for utilities and industrial facilities seeking long-term, low-maintenance medium-voltage control.