Square D QOB340GFI - 4A, 3-Pole, Circuit Breaker

Meet the Square D QOB340GFI — a purpose-built 4 A, 3-Pole circuit breaker crafted to deliver trusted overcurrent protection in demanding electrical environments. This compact, three‑pole design is tailor-made for 3‑phase systems, making it an ideal fit for panelboards, switchboards, and control panels where reliable protection and safe operation are non‑negotiable.

Key specifications at a glance

• Current rating: 4 A
• Poles: 3-Pole
• Breaker type: Circuit Breaker

Why this 3-Pole design matters

The 3‑pole configuration simplifies wiring in three‑phase installations and coordinates smoothly with motor control centers and distribution panels. By providing dedicated protection across all three phases, it helps prevent cascading faults, reduces downtime, and supports safer operation of motors, drives, and control circuits in industrial and commercial settings.

Where it shines

• Panelboards and switchboards: Robust protection for multi‑phase feeders, with clear visibility and easy integration into existing Square D ecosystems.
• Control panels: Protects control circuitry and logic circuits in machines and automated systems.
• Motor control centers (MCCs) and OEM assemblies: Reliable trip performance in environments that demand consistent protection and quick replacement parts.

Unique value in everyday use

What sets the QOB340GFI apart is its precise 4 A rating paired with a dependable 3‑pole design, delivering targeted protection where small loads or segmented circuits need clean, predictable interruption behavior. This isn’t a generic breaker—it’s a component chosen for predictable performance in distributions that rely on clear, coordinated protection across all phases.

Practical guidance for deployment

• Match the 4 A rating to the protected load to ensure timely interruption without nuisance tripping.
• Structure installations to maximize accessibility for testing and maintenance within panel areas and MCCs.
• Prefer compatible Square D components to maintain electrical coordination and streamline replacements.

Who benefits from the QOB340GFI

Engineers, fabricators, and facilities teams working in industrial, commercial, and OEM environments will appreciate a dependable, three‑phase protection solution that integrates neatly into 3‑pole panel architectures. It’s the right choice when you need clear, consistent overcurrent protection in distribution panels and motor control centers without compromising on space or performance.