Square D QO230 30A Miniature Circuit Breaker – 120/240V, 2-Pole, Thermal Magnetic

Overview

The Square D QO230 Miniature Circuit Breaker is designed for residential panels operating on 120/240 VAC. This single device provides reliable overcurrent protection with a 30 A rating and a 10 kA interrupt capacity, making it a sturdy choice for standard electrical circuits.

Solid construction and easy installation

Built around the QO frame, this 2-pole, 1-phase breaker features a thermal magnetic trip for fast, predictable responses to overloads. A plug-on mount and a pressure plate deliver a secure, code-compliant connection, while the compact 1.5 in W x 2.91 in D x 3 in H footprint helps fit crowded panels.

Versatile wiring and mounting options

• Wire compatibility: 14–10 AWG or 14–8 AWG conductors
• Operating temperature rating up to 40°C for standard electrical environments
• 50/60 Hz operation supports typical residential power systems

Key specifications at a glance

• Voltage: 120/240 VAC
• Current rating: 30 A
• Interrupt rating: 10 kA
• Poles: 2, Phase: 1
• Mounting: Plug-on
• Frame: QO
• Made in the USA
• Includes: 1 QO230 breaker (not a multipack)

What this means in real life

In a typical home panel, this breaker guards a dedicated circuit against overloads, enabling quick isolation when a fault occurs. Its compact size and sturdy construction support dependable performance in everyday electrical tasks, from lighting runs to appliance circuits. While not a guarantee, many users appreciate the straightforward replacement process and the familiar brand ecosystem.