Siemens Q340H - 40 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

The Siemens Q340H is a 40A, 240V, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch-circuit protection in panelboards and loadcenters. Listed by AmpState, this breaker is built for quick, field-friendly upgrades and reliable performance where it matters most.

• Fast plug-in connection: Snap-in installation for rapid replacement or circuit-board upgrades, minimizing downtime during service or expansion.
• Thermal-magnetic trip unit: Combines heat and magnetic sensing for stable, repeatable protection that responds to both gradual overloads and instantaneous short circuits.
• Three-pole, 40A, 240V: Suited for three-phase distribution or multi-pole circuits common in residential, commercial, and light industrial environments.
• OEM panel compatibility: Engineered to integrate smoothly with Siemens load centers and panelboards for a cohesive, code-compliant installation.
• Versatile protection: Ideal for safeguarding branch circuits against overcurrent and short-circuit conditions, protecting wiring, devices, and connected equipment.

Technical snapshot: Siemens Q340H, 40A, 240V, 3-pole, plug-in molded case circuit breaker. Purpose-built for reliable branch-circuit overcurrent and short-circuit protection in both new builds and panel maintenance, across residential, commercial, and light industrial applications.

Why the Siemens Q340H stands out

• Targeted reliability: The thermal-magnetic design provides predictable trip behavior, helping you avoid nuisance trips while still offering fast response to faults.
• Efficiency in installation: The plug-in format removes extra steps and special tools, speeding up project timelines whether you’re stocking a service truck or outfitting a panel upgrade.
• Designed for Siemens systems: Built to align with Siemens panel architecture, reducing compatibility concerns and simplifying field wiring and protection coordination.

Ideal use cases and scenarios

• Residential panels undergoing circuit upgrades where a reliable 3-pole, 40A connection is required for balanced loads or specific multi-wire branch circuits.
• Small commercial distribution boards needing quick replacement to maintain uptime and protect critical circuits.
• Light industrial panels where a robust plug-in breaker supports ongoing maintenance cycles and equipment protection.

Practical guidance for getting the most from your Q340H

• Pair with compatible Siemens panelboards to ensure seamless fit and optimal trip coordination across circuits.
• Use in applications where both overload protection and rapid short-circuit interruption are essential for protecting wiring and devices.
• During installations, verify firm seating in the plug-in slots and follow standard electrical best practices for fixed‑config panels.