Square D 200 Amp QMB364W Fusible Panelboard Switch 3 Pole 600VAC #2

Meet the Square D 200 Amp QMB364W Fusible Panelboard Switch — a rugged, dependable solution engineered for demanding electrical distribution across industrial, commercial, and resilient residential environments. This 3-pole switch handles three-phase power with confidence, delivering solid main-control for medium to large circuits while providing straightforward maintenance through fuse-based protection.

Key specifications

• Amperage rating: 200 A
• Voltage rating: 600 VAC
• Configuration: 3-pole (three-phase)
• Protection style: Fusible panelboard switch for reliable overcurrent protection and easy fault isolation

Ideal use cases

• Panel upgrades in facilities that require a robust, fusible main switch for enhanced protection and simplified maintenance
• Retrofit projects replacing aging switches without a full panel redesign, saving time and disruption
• Maintenance replacements where fast, dependable component availability minimizes downtime
• Applications across industrial, commercial, and demanding residential settings that rely on durable, serviceable switching gear

Who benefits

• Electricians performing installation, commissioning, or servicing distribution panels
• Panel builders incorporating a proven fusible main switch into new or updated systems
• Maintenance, repair, and operations teams prioritizing dependable spares for critical infrastructure

Why this Square D panelboard switch stands out

Beyond its specs, the QMB364W embodies Square D’s commitment to durable, long-life electrical distribution components. The 3-pole, 200 A, 600 VAC design provides solid protection for multi-branch circuits while simplifying integration into existing panelwork. Its fusible topology enables straightforward replacement and fault isolation, helping you minimize downtime and keep essential systems operational. This isn’t just a switch — it’s a strategic upgrade for reliability and serviceability in demanding environments.

Practical installation and maintenance considerations

• Stock the exact QMB364W for quick swaps during service windows and routine maintenance
• Plan for fuse replacement workflows that align with your facility’s maintenance schedules to minimize any interruption to critical loads
• Ensure compatibility with your existing panelwork by verifying three-phase routing and wiring terminations match the 600 VAC, 200 A, 3-pole configuration
• Use as a strategic upgrade for facilities aiming to improve fault isolation, ease of future retrofits, and clearer maintenance paths

Whether you’re upgrading an aging distribution suite, retrofitting a facility for improved protection, or stocking reliable spares for MRO teams, the Square D QMB364W stands as a trusted, service-friendly choice. It’s built to keep critical circuits protected, while offering the practical flexibility you need for ongoing modernization and efficient maintenance workflows.