Square D QO330 - 30A, 3-Pole, Miniature Circuit Breaker (MCB)

Meet the Square D QO330 — a 30A, 3-Pole Miniature Circuit Breaker (MCB) engineered for dependable overcurrent protection in demanding electrical systems. This compact, robust device is designed to integrate seamlessly into panelboards, switchboards, and control panels, making it a versatile choice for new installations or maintenance upgrades.

Key advantages of the QO330 include its 30A rating paired with a 3-pole configuration, delivering solid protection for three-phase circuits commonly found in industrial and commercial environments. Whether safeguarding feeders, motors, or control circuits, this MCB helps prevent damage from overloads and short circuits while enabling quick, safe electrical isolation when needed.

Why choose the Square D QO330?

• Precise protection for three-phase systems: 3-pole design supports coordinated shutdown across all live conductors when an overcurrent event occurs.
• Streamlined integration: Compact form factor and straightforward installation into panelboards, switchboards, and control panels.
• Reliable performance: Backed by Square D’s proven reliability, helping reduce downtime and extend equipment life in industrial, commercial, and OEM applications.
• Versatile applications: Ideal for motor control centers, plant feeders, and critical control circuits where safe, predictable protection is essential.

Ideal use cases

• Industrial machinery and manufacturing lines requiring robust overcurrent protection for three-phase loads
• Commercial electrical panels and distribution enclosures needing dependable circuit protection
• OEM equipment and systems where quick replacement and consistent protection are crucial

What you can expect in practice

With the Square D QO330, you get a trusted, purpose-built component that guards wiring and equipment from overloads, helps prevent electrical fires, and supports safe, predictable shutdowns during fault conditions. It’s a practical choice for professionals who value reliability, ease of maintenance, and compatibility with standard distribution setups.

Specifications at a glance

• Current rating: 30A
• Poles: 3-Pole
• Breaker type: Miniature Circuit Breaker (MCB)

Keep critical systems protected with the Square D QO330 — a dependable, three-phase MCB designed for modern distribution panels, switchboards, and control enclosures. Install it where reliable overcurrent protection and quick, safe disconnection are priorities, and you’ll be ready to maintain uptime across industrial, commercial, and OEM environments.