Siemens QG330 - 30 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Siemens QG330: a 30-amp, 240-volt, 3-pole plug-in molded case circuit breaker designed to deliver dependable overcurrent and short-circuit protection where it counts—inside panelboards and load centers. Built for quick, straightforward service, it minimizes downtime while delivering precise protection for demanding electrical systems.

• Fast plug-in connection—streamlined installation and effortless replacement that reduces panel downtime and keeps projects moving.
• Thermal-magnetic trip unit—provides stable, repeatable protection by quickly responding to short circuits and scaling overcurrent protection with temperature changes.
• Exact compatibility with Siemens OEM load centers—designed to fit and perform reliably with matching panelboards, ensuring proper fit and predictable interruption characteristics.
• Versatile application—suitable for residential, commercial, and light industrial environments where a 3-pole, 240V protection scheme is required.

Technical snapshot

• Manufacturer: Siemens
• Part Number: QG330
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Why this matters in real-world setups: the QG330 is purpose-built for reliable protection of multi-pole 240V circuits. It ensures that when a fault occurs, the circuit cleanly disconnects to protect wiring and equipment, while its thermal-magnetic design maintains predictable behavior under varying loads and environmental conditions. This is especially important in panels that service multiple 240V branches or in commercial and light industrial distribution where uptime and consistency are critical.

Ideal use cases

• Replacing a worn or failing 3-pole 30A breaker in panelboards and load centers
• Installing new 3-phase or multi-branch 240V circuits in commercial or light industrial environments
• Upgrading panel protection in residential settings that require robust 3-pole, 240V coverage

Practical considerations for installation and operation: verify compatibility with your Siemens OEM panelboard, ensure the correct plug-in mounting is used for your enclosure, and follow standard electrical procedures for breaker installation. The QG330’s 30A rating and 240V specification make it a precise choice for safeguarding specific branch circuits without over‑tripping adjacent loads.