Square D | FAL12040 | Circuit Breaker | 40A | 1-Pole | 120V | 10kA | Feed-Through

Meet the Square D FAL12040 — a purpose-built 40A, 1-Pole, 120V circuit breaker crafted for reliability in maintenance, retrofit, and replacement projects where exact specs matter. When your panel calls for a precise fit, this model delivers consistent protection with a focus on real-world use.

The Feed-Through design adds versatile wiring options, allowing you to protect the primary circuit while efficiently routing downstream circuits. With a robust 10kA interrupting capacity, it stands up to higher fault currents often encountered in mixed residential and light commercial environments, giving you peace of mind when critical loads are connected.

Key specifications at a glance

• Amperage: 40A
• Poles: 1-Pole
• Voltage: 120V
• Interrupting Rating: 10kA
• Configuration: Feed-Through

Why this FAL12040 matters for your project

• Exact fit for Square D panels that require a FAL-series 1-pole, 40A, 120V device, ensuring reliable trip performance without modifications.
• Feed-Through capability streamlines wiring when you need to feed additional circuits or subfeeds while maintaining solid overcurrent protection.
• Part number FAL12040 serves as the most reliable reference for compatibility, reducing guesswork during replacements and retrofits.

Ideal use cases

• Retrofit and replacement in residential panels where a precise 40A, 1-pole, 120V breaker is required
• Maintenance scenarios in legacy Square D installations that demand exact form factor and trip characteristics
• Subfeed configurations in panels designed to leverage feed-through protection for organized, scalable wiring

Installation and compatibility tips

Before ordering, verify fit and ratings against your panel’s labeling. Use the part number FAL12040 as your compatibility anchor to ensure you’re selecting a breaker that matches the panel’s design and protection requirements. For best results, follow panel manufacturer guidelines and ensure the device is mounted in the correct slot with secure, torque-appropriate terminations.

In practice, the Square D FAL12040 is a precise, proven solution for electricians and homeowners upgrading or maintaining panels that demand a dependable 40A, 1-pole, 120V device with the flexibility of feed-through wiring. It delivers predictable protection, clean wiring integration, and a straightforward path to compliant, safer electrical systems.