Square D | A1B2100 | Circuit Breaker | 100A | 2-Pole | 240V | 10kA | Bolt-On

Engineered to protect 240V circuits in commercial and industrial panels, the Square D A1B2100 is a 100A, 2-pole bolt-on circuit breaker designed for reliable service, retrofit projects, and straightforward replacements. When you need precise spec matching to keep your electrical system safe and compliant, this unit delivers.

• Amperage: 100A
• Poles: 2-Pole
• Voltage: 240V
• Interrupt Rating: 10kA
• Mounting: Bolt-On
• Part Reference: A1B2100

Why the A1B2100 stands out

What makes this breaker unique is its precise combination of amperage, two-pole configuration, 240V operation, and a robust 10kA interrupt rating, all in a bolt-on design that simplifies installation in compatible panels. This means reliable tripping behavior on fault conditions and secure mounting that resists vibration and movement in demanding environments. The bolt-on format is ideal for retrofit and replacement where space or bus configurations favor a solid, mechanical connection.

Ideal use cases

• Maintenance and retrofit projects where a like-for-like replacement is required
• Upgrading panel protection on 240V circuits that demand solid, immediate disconnects
• Replacement in commercial or light industrial panels that accept bolt-on, 2-pole protection for continuous service

Installation tips and best practices

• Verify panel compatibility: use the part number A1B2100 as the primary reference, and confirm that your enclosure accepts bolt-on, 2-pole breakers of this class.
• Before working, power down the panel and follow lockout/tagout procedures to ensure a safe installation.
• Contact-free inspection of bus stabs and mounting points helps prevent misalignment during seating.
• Consider keeping a spare A1B2100 on hand for quick replacements and minimal downtime during maintenance cycles.

Note: Confirm fit and ratings before ordering. The part number A1B2100 is the best reference for compatibility, ensuring this 100A, 2-pole, 240V bolt-on circuit breaker aligns with your specific Square D panel and application.