Square D | 999290 | Circuit Breaker | 90A | 2-Pole | 600V

Introducing the Square D 999290 circuit breaker—a dependable, high-capacity protection device designed for demanding electrical installations. With a 90-amp rating and two-pole configuration, this breaker is built to safely interrupt current on dual-hot circuits and accommodate higher-voltage systems up to 600V. Ideal for maintenance, retrofit, and replacement projects where exact compatibility matters.

Key specifications

• Amperage: 90 A
• Poles: 2-Pole
• Voltage rating: 600 V
• Part number: 999290
• Compatibility note: Confirm fit and ratings before ordering. Part number is the best reference for compatibility.

Why this Square D breaker stands out

The 2-pole design protects two hot legs with a common trip, ensuring simultaneous disconnect in the event of a fault. Its 90A capacity makes it suitable for feeder protection and motor circuits in commercial or industrial panels, while the 600V rating provides headroom for higher-voltage distribution environments. This is a purpose-built replacement part that aligns with Square D panels and accessories, helping you keep systems up to date without unnecessary rewiring.

Ideal use cases

• Replacing an existing 999290 or compatible Square D circuit breaker in maintenance or upgrade projects
• Retrofits where higher current protection is required for feeders or motors
• Protection of two-hot-leg circuits in 120/240V or higher-voltage panel configurations

Installation and compatibility tips

• Use the part number 999290 as the primary reference when checking panel compatibility.
• Ensure your panel is rated for 600V operation and accepts 2-pole breakers of this size.
• Follow standard electrical safety practices and torque specifications provided by your panel manufacturer during installation.

Practical guidance for decision-makers

When evaluating protection options for a retrofit or replacement project, this Square D 999290 offers a robust combination of current capacity (90 A), dual-pole protection, and a 600V rating, making it suitable for a range of commercial and light-industrial applications. If the goal is reliable fault interruption on both hot legs with a known, verifiable part reference, this breaker aligns with the common Square D ecosystem and helps maintain system consistency across panels and devices.