QB-45 | Circuit Breaker | 45A | 1-Pole | 240V

QB-45 Industrial Circuit Breaker — 45A, 1-Pole, 240V

The QB-45 is a purpose-built industrial circuit breaker designed for maintenance, retrofit, and replacement tasks where precise specs matter. With a 45-amp rating, a single pole, and a 240V operating voltage, this device delivers dependable overcurrent protection for demanding electrical circuits in commercial and light industrial environments. By sticking to the QB-45 part number as your primary reference, you’ll streamline compatibility in your panels and distribution systems.

Key benefits at a glance

• Exact electrical profile: 45A rating, 1-Pole, 240V to fit standard single-circuit protection needs without over- or under-rating.
• Compatibility-first reference: The part number QB-45 is the most reliable guide for matching with existing panels and replacement schedules.
• Maintenance-friendly: Ideal for retrofit projects where downtime must be minimized and consistency across a fleet of breakers is important.
• Replacement-ready: A straightforward solution for replacing worn or failed breakers in compatible enclosures, preserving system protection and safety.

Use cases and ideal applications

• Maintenance and service upgrades for electrical panels that require a 45A, 1-Pole, 240V protection device.
• Retrofit projects where modernizing old control circuits calls for matching the existing protection scheme.
• Replacement in legacy equipment where the QB-45 is specified as the compatible component, ensuring continuity of protection characteristics.
• Small to medium loads in industrial settings, such as feeders, control circuits, and standalone equipment branches that operate at 240V.

Specifications at a glance

• Amperage: 45A
• Poles: 1-Pole
• Voltage: 240V

Installation and compatibility guidance

Before ordering, confirm fit and ratings for your panel or enclosure. The QB-45 part number is the best reference for compatibility, helping you avoid mismatches that could affect protection and performance. If your application requires a single-pole device for a 240V circuit, this breaker is a straightforward, reliable option that aligns with standard electrical distribution practices.

Why choose the QB-45 over generic substitutes

Unlike generic equivalents, the QB-45 is scoped for precise alignment with standard panels and field services that rely on consistent, documented part numbers. This specificity supports safer maintenance workflows, cleaner spare-part inventories, and predictable performance across service life, giving technicians and facility managers a trusted component for critical protection needs.

Practical tips for best results: store breakers in their original packaging until install, verify that the panel’s rating supports a 1-Pole, 240V device, and consult a licensed electrician if you’re upgrading or replacing multiple components in one panel to ensure coordinated protection across circuits.