Square D A1B1DB Circuit Breaker, 20A, 1-Pole, 120V

Meet the Square D A1B1DB Circuit Breaker—your reliable, field-ready solution for industrial electrical service, maintenance, and replacement projects. With 20 amps of protection, a single pole, and 120-volt operation, this breaker shields circuits and connected equipment from overloads while helping keep downtime to a minimum.

Precision fit for Square D systems

The A1B1DB is purpose-built to integrate with Square D panels and distribution gear. Use the part number to verify compatibility with your specific application and panel model. This isn’t a generic substitute—it's a true match for demanding industrial environments where every connection and trip matters.

Key specifications

• Amperage: 20 A
• Poles: 1
• Voltage: 120V
• Part Number: A1B1DB
• Brand: Square D

Why this 1-Pole, 120V breaker is ideal for you

Built for industrial service, this breaker protects individual circuits—such as lighting, receptacle runs, and control circuits—within panelboards. The single-pole design is tailored for 120V systems, delivering prompt interruption of fault current to prevent damage to wiring, sensors, motors, and downstream equipment. Its rugged construction is designed to withstand the rigors of active industrial environments.

Use cases and scenarios

• Replacing a failed 20A, 1-pole breaker in an existing Square D panel
• Upgrading older installations with a recognized Square D component for improved reliability
• Maintenance workflows requiring quick, field-ready replacements
• New installations needing precise 120V, 20A, 1-pole protection

Practical guidelines and support

Always verify fit by part number and application requirements before purchasing. If you’re unsure about compatibility with your panel, provide the part number and panel details—our team can help confirm the best match for your setup. And if you need help matching a part number or confirming compatibility, message us and we’ll assist you promptly.

Ready to install in compatible Square D panels, the A1B1DB delivers dependable overcurrent protection designed for industrial environments, helping you protect equipment, reduce downtime, and keep operations running smoothly.