Square D QMB-323-TW - 100A, 240V, 3-Pole, Switch

Meet the Square D QMB-323-TW, a rugged 3-pole fusible switch engineered for dependable on/off isolation and overcurrent protection in demanding industrial and commercial environments. With a 100A, 240V rating, this switch delivers reliable control where space is at a premium and serviceability matters.

Why the QMB-323-TW stands out

• Three-pole isolation: Disconnects all conductors simultaneously for safer maintenance and reduced risk during service.
• Compact, maintainable design: Built to fit into tighter panels and enclosures, with field-friendly fuse compatibility for straightforward servicing.
• Reliable protection: Integrated as a fusible switch to provide clear, local overcurrent protection alongside physical isolation.
• Dense industrial performance: Robust construction designed to withstand the rigors of busy commercial and industrial environments.
• Ideal for critical applications: Perfect as a motor disconnect, panelboard input, or branch circuit protection where a compact, easy-to-maintain solution is required.

Key specifications

• Model: QMB-323-TW
• Amperage: 100A
• Voltage: 240V
• Poles: 3-Pole
• Type: Fusible switch (maintainable)

Ideal applications

• Motor disconnects for pumps, fans, conveyors, and other equipment in industrial facilities
• Panelboards requiring a compact, serviceable disconnect
• Branch circuit protection within electrical enclosures and control panels

How it helps you today

Choosing the QMB-323-TW means you’re investing in a control solution that prioritizes safety, accessibility, and long-term serviceability. The three-pole design ensures full de-energization for maintenance windows, while the fusible switch configuration provides targeted protection without sacrificing ease of replacement or adjustment. Its compact footprint helps you maximize panel space without compromising reliability, making it a smart choice for busy facilities that demand consistent performance from their electrical safety devices.

Installation and care tips

For best results, install by a qualified electrician following applicable electrical codes. Select the appropriate fusible elements for your protection needs and verify compatibility with your panelboard or switchgear. Regular inspection of the switch’s contacts and enclosure integrity will help maintain clean switching action and dependable protection over time.