Square D | QOB3205237 | Circuit Breaker | 20A | 3-Pole | Bolt-On

Meet the Square D QOB3205237 Circuit Breaker — a dedicated 20A, 3-pole bolt-on solution built for precise protection in 3-phase electrical systems. Designed for maintenance, retrofit, and replacement projects, this unit ensures you have the exact spec alignment you need when reliability matters most.

Key advantages that matter in the real world

• Three-pole protection for full phase isolation — prevents partial protection by simultaneously disconnecting all three conductors, simplifying safe servicing of 3-phase equipment.
• Bolt-On mounting for secure installation — engineered for stable seating in compatible enclosures, reducing movement and vibration over time.
• Exact part reference for compatibility — part number QOB3205237 is the best reference to ensure a proper fit in Square D bolt-on panels.
• Specifically rated for 20A circuits — ideal for protecting motors, compressors, and other 3-phase loads where a 20-amp limit is required.

When to use this 3-pole bolt-on breaker

This breaker is the go-to choice for:

• Maintenance and service on Square D panels that accept bolt-on units, ensuring you have a reliable, like-for-like replacement.
• Retrofit projects where upgrading or expanding a 3-phase circuit demands an exact 20A, 3-pole protection device.
• Replacement scenarios where a failed breaker needs a precise match to existing panel architecture and wiring configuration.

Important compatibility notes

Before ordering, confirm fit and ratings for your specific panel. The QOB3205237 is designed to align with Square D’s bolt-on QOB series, so using the exact part number is the best way to verify compatibility with your enclosure and trip characteristics.

What you’ll get and how it helps your system

• Reliable protection for 3-phase loads, helping prevent equipment damage from overcurrent and short circuits.
• Clear, dependable replacement path for panels that require a 3-pole, 20A, bolt-on breaker—reducing downtime and guesswork during service.
• Intuitive fitment within appropriate Square D bolt-on panels, enabling straightforward installation for qualified electricians.

Practical tips for installation and lifecycle

• Work with the main supply de-energized and follow all local electrical codes during replacement or retrofit.
• Verify that the panel accepts bolt-on breakers in the QOB family and that the 20A rating matches your circuit needs.
• Keep the part number QOB3205237 on hand as the primary reference for future maintenance or ordering identical replacements.