Schneider Electric QMB400T6 400A 3P 600V Safety Switch, Fusible | AmpState

Meet the Schneider Electric QMB400T6—a 400 A, 3-pole, 600 V fusible safety switch engineered for reliable equipment disconnect and precise isolation at the point of use. This isn’t a bare switch; it’s a purpose-built solution designed to keep critical systems safe and accessible for service, maintenance, and operation.

Designed for replacement projects and stocking spares when BOM alignment to the original part number matters, the QMB400T6 ensures you can retrofit or restore control layouts without compatibility concerns. With Schneider Electric’s proven reliability, you’ll minimize downtime and maintain consistent performance across your electrical distribution.

Key specifications

• Manufacturer: Schneider Electric
• Part number: QMB400T6
• Type: Fusible Safety Switch
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Availability: Available from AmpState

Why choose this fusible safety switch?

• Point-of-use isolation: Provides safe, immediate disconnection exactly where protection is needed, helping to speed maintenance and reduce risk.
• Integrated protection: Fusible design combines switching and overcurrent protection in a single durable enclosure, simplifying wiring and saving panel space.
• Balanced, reliable performance: The 3-pole configuration ensures even current handling across phases for robust 3-phase applications in industrial settings.
• BOM-friendly replacement: When updating or repairing, using QMB400T6 keeps your part numbers consistent with original documentation and procurement records.
• Support from AmpState: If you need help confirming fit or compatibility, AmpState staff are ready to verify that this unit matches your panel requirements.

Use cases and practical scenarios

Ideal for machine control panels, production line disconnects, and service entrances in manufacturing, HVAC, and industrial facilities. Use for new installations where a rugged fusible disconnect is required or as a precise replacement for aging safety switches to preserve system integrity and safety.

How it compares to typical switches

Unlike non-fusible disconnects, this unit provides built-in protection within the switching device, reducing the need for extra fuse blocks and simplifying installation. With a 600 V rating and 400 A capacity, it fits a wide range of equipment and ensures a clear, safe isolation path for maintenance personnel.

Need help confirming fit or locating a compatible fuse kit? AmpState can guide you to the correct configuration for your panel and installation standards.