Square D QHB120 - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QHB120—a 20A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Built to endure the demands of residential, commercial, and light industrial environments, this unit combines a secure mounting method with precise protection you can trust.

• Secure bolt-on mounting: A rigid bus connection minimizes movement and vibration, helping maintain a reliable, arc-free electrical path even in panels that see frequent door openings or equipment starts.
• Thermal-magnetic trip unit: A dual-sensor protection system that reacts to both overloads (thermal) and short circuits (magnetic) for fast, repeatable trips and reduced nuisance outages.
• OEM-compatible design: Engineered to integrate smoothly with matching Square D OEM loadcenters and panelboards, ensuring consistent trip characteristics and straightforward replacement.
• Versatile, space-conscious configuration: A compact 1-pole, 20A breaker that fits standard panelboard footprints without complicating your electrical layout.
• Reliable for a range of circuits: Ideal for residential lighting and outlet circuits, small commercial loads, and light industrial applications where dependable protection is essential.

Technical snapshot: Square D QHB120, 1-pole, 20A, 120V, bolt-on molded case circuit breaker. Designed for branch circuit overcurrent and short-circuit protection in panelboards and loadcenters, with a focus on durability and predictable performance.

Why this breaker is a smart choice for your panel

When reliability matters, the Square D QHB120 delivers. Its bolt-on mounting creates a solid, vibration-resistant connection that helps prevent loose contacts over time. The thermal-magnetic trip unit provides stable protection across varying loads and temperatures, so you’re less likely to experience unexpected trips during routine startup or high-demand moments.

This breaker is ideal for:

• Residential service panels and lighting circuits
• Small to mid-size commercial installations with mixed loads
• Light industrial control and power distribution where standardization matters

Seamless integration and consistent performance are the hallmarks of the QHB120. If you’re upgrading or replacing a like-for-like bolt-on, 1-pole protection device, this breaker provides a straightforward, code-compliant solution that keeps your electrical system protected and easy to maintain.