Square D QO230 Miniature Circuit Breaker - 30A, 120/240 VAC, 2-Pole

Square D QO230 Miniature Circuit Breaker: Compact, reliable panel protection

The Square D QO230 is a 30 amp miniature circuit breaker designed for 120/240 VAC panels. Built on the QO frame, this two-pole, single-phase device uses a thermal magnetic trip to respond to overcurrent and help maintain orderly electrical distribution in homes and light commercial installations. With a compact footprint and plug-on mounting, it fits neatly into standard panels and supports straightforward servicing when circuits are updated or modified.

In terms of construction, you may notice the clean termination platform and the pressure plate that ensures a solid connection under vibration. The unit accepts a broad range of conductor sizes, from 14 AWG up to 8 AWG, making it adaptable for different wiring schemes. It is rated for operation in ambient temperatures up to 40 C, aligning with typical indoor panel environments and helping installers plan for a safe, consistent installation.

Durability and manufacturing

This breaker is made in the USA and designed to support consistent compatibility within the Square D QO ecosystem. The thermal magnetic trip combines a thermal element for slow, accurate response with a magnetic element for rapid action during high fault currents. The plug-on mounting minimizes the chance of loose connections while simplifying panel upgrades, maintenance, and future expansion. The result is a device built to endure routine panel maintenance and everyday electrical work.

Key specifications

• 120 to 240 VAC operation for versatile panel applications
• 30 A circuit protection for typical branch circuits
• 10 kA interrupt rating for higher fault current scenarios
• QO Frame, 2-pole, 1-phase design
• Thermal magnetic trip mechanism for balanced response
• Plug-on mount for straightforward installation
• Wire range supports 14 to 8 AWG sizes
• 40 C ambient temperature rating for ordinary indoor use
• Made in the USA with a focus on quality and compatibility

Installation and everyday use

• Ideal for protecting branch circuits such as lighting, outlets, or small appliances
• Two-pole design handles two conductors while keeping a compact footprint
• Clear labeling and quick reset improve panel usability without overhauling layouts
• Plug-on mounting simplifies upgrades in existing panels and new builds

Note that actual protection and performance depend on the full panel setup. The Square D QO230 offers standard protection within the QO system, supporting installers who value consistent parts and straightforward maintenance.