GE QMQ340 - 40 A, 600 V Fusible Panelboard Switch | AmpState

The GE QMQ340 Fusible Panelboard Switch from AmpState is a trusted, legacy disconnect designed to keep older GE panel installations safe, reliable, and easy to maintain. Built to the proven standards that have served industrial and commercial facilities for decades, this 40 A, 600 V device delivers dependable performance where downtime and reliability matter most.

Why this part stands out

• Historic GE reliability—a component built with the same craftsmanship and design philosophy that long-sustains critical electrical systems in factories, warehouses, and commercial spaces.
• 40 A, 600 V capacity in a compact fusible panelboard switch, delivering a clear isolation point for service, maintenance, or fuse changes without overhauling your distribution layout.
• Fusible protection with fast isolation—combines a disconnect with fuse-based safety, enabling rapid de-energization when work is required or a fault occurs, helping to contain faults at the source.
• Legacy-ready refurbishment—an ideal choice for refurbishing aging GE panels, allowing you to extend the life of existing infrastructure without unnecessary modernization costs.
• AmpState sourcing convenience—your dependable channel for hard-to-find vintage electrical components, streamlining procurement for maintenance inventories and retrofits.

Ideal use cases

• Refurbishing aging GE panelboards in factories, warehouses, and commercial facilities where downtime costs matter.
• Replacing a GE QMQ340 in legacy electrical diagrams that specify this exact rating and configuration.
• Providing a dedicated isolation point during routine maintenance, wiring upgrades, or fuse changes in mid-voltage panel layouts.
• Maintaining a ready spare part in maintenance inventories to accelerate repair response and minimize equipment downtime.

What makes it practical in real-world workflows

When working with older panelboard architectures, compatibility and reliability matter more than chasing the latest model. The GE QMQ340 aligns with historic GE footprints, preserving original design intent while delivering a robust 40 A, 600 V rating to balance performance and safety. Its fuse-based protection helps you isolate sections of the panel quickly, reducing exposure during maintenance and enhancing fault containment within mid-voltage layouts.

Installation and safety notes

As a high-energy electrical component, installation and servicing should be performed by a qualified electrician. Confirm that the panelboard, wiring, and fuse elements are compatible with the QMQ340’s specifications, and follow all applicable electrical codes during replacement or retrofitting. Practice proper de-energization, lockout/tagout, and post-installation testing to ensure safe operation.

Key specifications at a glance

• Model: GE QMQ340
• Rating: 40 A, 600 V
• Type: Fusible panelboard switch with integrated isolation
• Compatibility: GE-style panel footprints suitable for legacy installations
• Supplier: AmpState

For teams maintaining and refurbishing legacy GE equipment, the GE QMQ340 from AmpState offers a dependable, historically validated solution. It preserves the integrity of your original electrical infrastructure while delivering the safety and ease of a dedicated isolation point, helping you extend service life and minimize outages in demanding environments.