Siemens QG320 - 20 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Siemens QG320 — a dependable 3-pole plug-in molded case circuit breaker designed for reliable branch circuit overcurrent and short-circuit protection. With a compact, plug-in form factor, this breaker slides into compatible Siemens panelboards and loadcenters for fast, downtime-minimizing replacements.

Why the QG320 stands out

• Fast plug-in connection for quick installation and simple replacement, reducing panel downtime during maintenance or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance, reacting to overloads thermally and short circuits magnetically for fast disconnection when needed.
• Three-pole design protects all three hot conductors in 240V systems, making it ideal for 3-phase or 240V applications in commercial and light industrial environments.
• OEM-compatible engineered to work with matching Siemens OEM load centers and panelboards, ensuring consistent protection and electrical compatibility.
• Versatile application suitable for residential, commercial, and light industrial use, delivering dependable protection across a range of installations.

Technical snapshot

• Manufacturer: Siemens
• Part number: QG320
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 240V
• Poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

electricians and facility managers rely on the QG320 for quick, reliable protection in panelboards and loadcenters. Use it when you need to:

• Add or replace a 3-pole 20A 240V protection device in commercial or light-industrial panelboards.
• Upgrade 240V circuits that require robust short-circuit protection with a fast-responding thermal-magnetic trip.
• Maintain consistent protection across multiple hot legs in multi-wire branch circuits.
• Ensure compatibility with existing Siemens OEM panel infrastructure to preserve protection coordination and labeling.

Installation and care tips

• Verify the panelboard or loadcenter specification to confirm compatibility with plug-in QG-series breakers before installation.
• Handle with standard electrical safety practices; install only on de-energized circuits and follow local electrical codes.
• When a 3-pole breaker trips, inspect the connected loads and conductors for faults to prevent nuisance trips and repeated outages.
• Keep spares on hand for rapid replacement in service panels to minimize downtime during maintenance windows.

Designed to deliver dependable protection with straightforward installation, the Siemens QG320 3-Pole 20A 240V plug-in breaker is a practical, long-lasting choice for safeguarding electrical distribution in homes, workplaces, and light industrial facilities. Its combination of fast plug-in mounting, precise thermal-magnetic trip, and OEM panel compatibility makes it a reliable foundation for safe, efficient electrical systems.