Square D | PAF1636-900A | Circuit Breaker | 900A | 3-Pole | 600V

Meet the Square D PAF1636-900A circuit breaker — a purpose-built protection solution for high-demand electrical distributions. With a 900A amperage rating, a 3-Pole configuration, and a 600V rating, this device is engineered to safeguard large three-phase systems in industrial and commercial environments.

Designed for maintenance, retrofit, and replacement projects where exact specifications matter, the PAF1636-900A is the precise reference you need. The part number is the best compatibility guide, ensuring your panel, bus arrangement, and overall system alignment are preserved during upgrades or service work.

Key specifications

• Amperage: 900A
• Poles: 3-Pole
• Voltage: 600V
• Part number: PAF1636-900A

Who this is for

Facility managers, electrical contractors, and panel builders tackling maintenance, retrofit, or replacement projects in warehouses, manufacturing floors, data centers, and large commercial facilities will appreciate the reliability and known performance of Square D. This breaker fits into established three-phase distribution schemes where precise specs are non-negotiable.

Why this matters

In demanding electrical systems, a breaker must both fit exactly and perform consistently under fault conditions. The combination of 900A capacity, 3-Pole design, and 600V rating aligns with common industrial panels, reducing setup guesswork and keeping downtime to a minimum.

Practical considerations and tips

Before ordering, confirm fit and ratings for your specific panel. Use the exact part number, PAF1636-900A, as your primary compatibility reference. Check the panel’s frame style and bus configuration, and verify any required trip characteristics or accessory options for your installation. If you’re replacing an existing breaker, ensure the replacement’s footprint and mounting align with your enclosure to avoid fit issues.

Why choose Square D over alternatives

For projects demanding precise specification alignment and a trusted brand lineage, this PAF1636-900A delivers a straightforward, reliable solution. Its three-pole arrangement supports balanced protection across all phases, enabling clean coordination with upstream and downstream protection strategies while meeting the needs of heavy-duty electrical systems.