Siemens Q340 - 40 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Siemens Q340 — a 40A, 240V, 3-pole plug-in molded case circuit breaker engineered for dependable branch circuit protection in panelboards and loadcenters. Designed to integrate seamlessly into standard electrical distribution, the Q340 delivers reliable overcurrent and short-circuit protection where it matters most.

Why this breaker stands out

• Fast plug-in connection for quick installation and effortless replacement, minimizing downtime during service or upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection performance, reducing nuisance trips while reliably interrupting fault conditions.
• OEM-compatible design ensures seamless compatibility with matching Siemens OEM loadcenters and panelboards for a cohesive, risk-averse electrical system.
• Versatile application suitable for residential, commercial, and light industrial environments where dependable distribution protection is essential.

What it is and how it protects your system

The Siemens Q340 is a molded case circuit breaker built to guard against branch circuit overcurrent and short circuits. Its plug-in mounting style simplifies installation in compatible panelboards, enabling fast upgrades or replacements without sacrificing protection quality. The 3-pole configuration provides robust three-phase protection when your electrical system requires it, while the 240V rating supports common commercial and industrial circuits as well as multi-wire branch circuits in larger homes or facilities.

Technical snapshot

• Siemens
• Part number: Q340
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Residential service panels undergoing expansion or modernization where reliable protection is required for multi-circuit layouts.
• Commercial distribution panels handling multiple branch circuits with higher load demands.
• Light industrial applications where compact, plug-in protection is preferred for quick swaps and minimal downtime.

Practical tips for optimal performance

Pair the Siemens Q340 with compatible OEM loadcenters and panelboards to ensure plug-in integrity and electrical compatibility. When replacing an older breaker, verify the 3-pole, 40A configuration matches the panel’s design to maintain consistent protection characteristics. Use in environments where rapid serviceability and dependable trip performance are critical to maintaining uninterrupted power for sensitive equipment and essential circuits.