Square D | 999270 | Circuit Breaker | 3-Pole | Bolt-On

Square D 999270 3-Pole Bolt-On Circuit Breaker is a purpose-built protection device designed for secure, reliable three‑phase service in maintenance, retrofit, and replacement projects. This bolt-on model delivers robust electrical protection with a mounting style that stays firmly in place under demanding conditions.

What makes this breaker stand out:

• 3-Pole bolt-on design ensures a solid mechanical connection to compatible panels, reducing vibration and connection drift during operation.
• Authentic Square D part with part number 999270 as the best reference for compatibility, aiding you in a precise match to your panel and rating.
• Versatile for maintenance, retrofit, and replacement tasks, so you can upgrade or restore protection in existing electrical systems without changing the enclosure.

Ideal use cases:

• Replacing a failed 3-pole breaker in a commercial or industrial panel where bolt-on installation is required.
• Retrofit projects that need a dependable, field-serviceable protection device for three-phase circuits.
• Maintenance shutdowns where a reliable, consistent trip response minimizes downtime and protects motors and feeders.

Smart buying guidance:

• Confirm fit and ratings before ordering. The part number 999270 is your strongest compatibility reference—match it to your panel’s model and rating.
• Check your panel’s labeling to ensure it accepts bolt-on 3-pole breakers and to determine the correct current rating for a like-for-like replacement.
• When in doubt, keep the panel model available during purchase comparisons to avoid mismatches and service delays.

With Square D, you’re choosing proven reliability and consistent protection for your three-phase circuits. The 999270 bolt-on 3-pole breaker helps you maintain safe, continuous operation with an installation process that technicians trust.