Square D | Q1B290 | Circuit Breaker | 90A | 2-Pole | 240V | Bolt-On

When dependable electrical protection matters, the Square D Q1B290 circuit breaker delivers a rigorous 90-amp, 2-pole, 240-volt solution in a bolt-on design. Engineered for maintenance, retrofit, and replacement projects, this unit is a precise fit for panels that require the Q1B290 form factor and ratings.

Key specifications

• Amperage: 90 A
• Poles: 2-Pole
• Voltage: 240 V
• Mounting: Bolt-On
• Part reference: Q1B290

Why it matters in your electrical setup

This breaker provides precise overcurrent protection for 240V circuits in commercial and residential panels that demand a secure bolt-on connection. The 2-pole configuration safeguards both conductors simultaneously, ensuring simultaneous shutoff in fault conditions and helping protect wiring, devices, and downstream equipment. By using the exact Q1B290 specification, you minimize the guesswork during installation and support long-term panel reliability.

Ideal use cases

• Retrofits in aging panels where the bolt-on, 2-pole 240V form factor is required
• Maintenance swaps to restore original protection on 90A circuits
• Replacement of faulty breakers in systems that operate at 240V with two hot legs
• New installations in applications that demand robust, vibration-resistant mounting

Installation and compatibility guidance

• Always confirm fit and ratings before ordering; the part number Q1B290 is the best reference for compatibility.
• Use in panels designed to accept bolt-on breakers with 240V, 2-pole configurations.
• Verify electrical enclosure and bus-bar specifications align with this breaker’s form factor to ensure a secure, code-compliant installation.
• Follow manufacturer installation instructions and local electrical codes for safe handling and operation.

What sets this Square D option apart

Unlike generic protectors, the Q1B290 is a purpose-built match for Square D panels that require a 90A, 2-pole, 240V bolt-on breaker. The bolt-on mounting provides a robust, vibration-resistant connection ideal for panels exposed to movement or demanding environments, helping minimize nuisance trips and connection faults over time. With its exact part-number alignment, you gain a straightforward, reliable replacement path that preserves the panel’s original protection strategy.

Important: Confirm fit and ratings before ordering. The part number is your best reference for compatibility to ensure you get the right device for your specific panel model and electrical requirements.