Square D QMB-323-HW - 100A, 240V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

Meet the Square D QMB-323-HW fusible panelboard switch — a purpose-built, three-pole disconnect designed specifically for lighting and distribution panelboards in demanding commercial and industrial environments. With a robust 100 A at 240 V rating, this unit delivers dependable load switching and targeted overcurrent protection when paired with the correct upstream protection and fuse class.

Why this panelboard switch stands out

• Three-pole, 100 A at 240 V: provides a solid, balanced disconnect for three-phase systems, ensuring reliable isolation and safe maintenance.
• Fusible panelboard switch: integrates with your upstream protection scheme to deliver focused overcurrent protection where it matters most in lighting and distribution panels.
• QMB compatibility: designed for seamless integration with lighting and distribution panelboards using standard QMB mounting configurations, reducing installation tweaks and compatibility concerns.
• Industrial-grade reliability: part of Schneider Electric’s Square D lineage, engineered to perform consistently in demanding environments.
• Compact, easy integration: ideal for three-phase panel assemblies that need a compact fusible switch without sacrificing performance.

Ideal applications

• Commercial and industrial lighting panels that require a dedicated, controllable disconnect.
• Distribution panelboards in new builds or retrofit projects that demand robust overcurrent protection paired with reliable switching.
• Three-phase panel assemblies needing a fusible switch that fits standard QMB mounting configurations.

How it works and why it matters

The QMB-323-HW is designed to work in concert with upstream protection devices. When selected with the appropriate fuse class, it delivers precise overcurrent protection for protected sections of the panel, while providing a safe, mechanical disconnect for maintenance and troubleshooting. This coordination helps ensure protection, reliability, and code-compliant operation throughout the panel assembly.

Installation considerations

• Verify panelboard space and ensure mounting compatibility with standard QMB configurations.
• Confirm wire sizing and conduit routing meet your system design and local electrical codes.
• Use in accordance with Schneider Electric documentation for proper disconnect and protection coordination.
• Pair with the correct upstream protection and fuse class to match the QMB-323-HW rating and your specific design requirements.

Specifications at a glance

• Amperage: 100 A
• Voltage: 240 V
• Poles: 3
• Manufacturer: Schneider Electric / Square D
• Part Number: QMB-323-HW
• Series: QMB

Procurement is streamlined through AmpState, offering straightforward access to authentic QMB-323-HW units with dependable support. Ideal for professionals seeking a reliable, industry-grade fusible panelboard switch that aligns with lighting and distribution panelwork requirements, the QMB-323-HW delivers proven performance for commercial and industrial applications.