Square D QO3100BNRB 100A 3P 240V Circuit Breaker, QO, NEMA 3R | AmpState

The Square D QO3100BNRB 100A 3P 240V circuit breaker is built for dependable protection in panelboards, load centers, and electrical distribution setups. As a direct part-number match from the trusted QO family, this breaker simplifies procurement, stocking, and maintenance—so your teams spend less time searching and more time keeping systems safe. What sets the QO3100BNRB apart - Direct part-number match: Designed to slot straight into QO-style panels without guesswork, reducing installation errors and downtime. - Robust electrical protection: 100 A, 3-pole, 240 V configuration provides solid overcurrent protection for multi‑phase circuits, helping safeguard feeders and downstream equipment. - QO series compatibility: Consistent form factor and mounting approach across compatible Square D panelboards and load centers, streamlining replacements and upgrades. - NEMA 3R suitability in context: While the breaker itself is designed for reliable performance, it is compatible with NEMA 3R enclosures, making it a practical choice for outdoor-rated or weather-resistant installations when used inside a proper enclosure. - Trusted manufacturer and easy sourcing: Made by Square D and available from AmpState, ensuring authentic parts with straightforward ordering for maintenance stocks and project needs. Key specifications at a glance - Part number: QO3100BNRB - Manufacturer: Square D - Type: Circuit Breaker, QO series - Amperage: 100 A - Poles: 3 - Voltage: 240 V - Enclosure compatibility note: Suitable for use in NEMA 3R environments when installed in a compatible enclosure Ideal use scenarios - Maintenance teams stocking spare inventory: Keeps a ready-to-install part on hand for rapid replacements, minimizing downtime. - Panel builders and installers: Ensures a precise, race-ready fit for new builds and retrofits within QO-panel ecosystems. - Outdoor or damp-location projects (within a proper enclosure): Leverages NEMA 3R enclosure compatibility to protect critical circuits in challenging environments. Why this matters for your project - Operational continuity: Quick replacement with an authentic, direct-match part reduces project delays and protects critical loads. - Safer, more predictable upsets: The 3P 240V configuration supports reliable multi‑phase protection for complex electrical feeds. - Clear procurement path: The QO3100BNRB part number helps you avoid mismatches during ordering, planning, and on-site commissioning. Practical tips for installation and care - Confirm enclosure compatibility: Use within a NEMA 3R-rated enclosure or other appropriate weather-rated housing to align with outdoor or harsh-environment applications. - Match with existing panels: Verify that your Square D panelboard or load center is designed for QO-series breakers to ensure a seamless fit and proper trip coordination. - Stock strategy: Include the QO3100BNRB in maintenance inventories for faster turnaround on routine protection-replacement tasks. AmpState delivers authentic Square D components with clear compatibility guidance, so you can trust the fit and function of the QO3100BNRB 100A 3P 240V circuit breaker in your electrical distribution system.