Indoor vs Outdoor VCB Selection Guide: VS1/ZN85 vs ZW20/ZW32 (What to Choose)

Choosing the right vacuum circuit breaker (VCB) starts with one question: indoor switchgear cubicle or outdoor field installation? In this short guide, I break down the practical selection logic between VS1 / ZN85 (indoor VCBs) and ZW20 / ZW32 (outdoor VCBs)—based on mounting, environment, controls integration, and real field conditions.

What you’ll learn:

Indoor vs outdoor VCB: what changes in sealing, insulation surfaces, and interfaces

VS1 vs ZN85: when 12–24 kV indoor lineup selection differs from 40.5 kV indoor projects

ZW20 vs ZW32: how outdoor distribution needs and control integration shift the best choice

Field factors that actually drive failures: altitude, salt fog, condensation cycles, temperature swings

A fast decision checklist you can apply to your next MV project

📌 Full article / diagrams / selection flow: [https://xbrele.com/indoor-vs-outdoor-...]
📩 Need a recommendation? Send your basics: voltage class (kV), rated current (A), installation environment, altitude (m), pollution/salt level, control supply (VDC), and quantity.

Keywords: indoor VCB, outdoor VCB, vacuum circuit breaker selection, VS1 VCB, ZN85 VCB, ZW20 VCB, ZW32 VCB, medium voltage switchgear, overhead distribution recloser

#VCB #VacuumCircuitBreaker #MediumVoltage #Switchgear #Protection #DistributionNetwork #VS1 #ZN85 #ZW20 #ZW32 #XBRELE