Square D 9050FSR4 Circuit Breaker, 400A, 3-Pole, 600V

When industrial power stability matters, the Square D 9050FSR4 circuit breaker delivers dependable 3‑phase protection for demanding environments. Rated at 400 A and designed for 600 V systems, this 3-pole unit fits into heavy-duty electrical service panels used in manufacturing, facilities, and maintenance operations. Use the part number 9050FSR4 to verify compatibility with your application and panel family.

What makes the 9050FSR4 stand out:

• High-current, three-pole protection: 400 A capacity with a 3-pole configuration supports balanced three-phase loads and synchronized switching.
• 600-volt compatibility: Engineered for standard industrial distribution networks common in production lines, warehouses, and equipment rooms.
• Trusted Square D build: A legacy of reliability in critical electrical protection, designed for service, maintenance, and replacement projects.
• Part-number dependent compatibility: Ensure fit by confirming the exact part number against your panel and application requirements; this reduces downtime and ensures proper trip characteristics.

Ideal use cases:

• Industrial service upgrades: replace aging breakers with a compatible 9050FSR4 to maintain protection levels for high-current circuits.
• Maintenance and downtime planning: carry a compatible spare to minimize panel outages during routine servicing.
• New installations in 600 V, three-phase systems where reliable disconnection and protection are essential.

How to confirm compatibility:

• Cross-check the part number: 9050FSR4 against your equipment's documentation and panel specification.
• Match amperage (400 A), number of poles (3), and voltage rating (600 V) to your circuit design and protection requirements.
• If you’re unsure, send us a message with your application details and we’ll help verify fit and alternatives.

Ready to secure your electrical system with a proven Square D solution? Check the 9050FSR4’s compatibility for your specific panel and project—then reach out for expert guidance to ensure seamless integration into your maintenance or upgrade plan.