Square D | Q1B370 | Circuit Breaker | 70A | 3-Pole | 240V | 10kA | Bolt-On

Meet the Square D Q1B370—a purpose-built bolt-on circuit breaker designed to deliver dependable protection for three‑phase systems. With 70A capacity, 3 poles, and 240V operation, this device is crafted for maintenance, retrofit, and replacement projects where exact compatibility matters. The bolt‑on design delivers a secure, rigid connection ideal for demanding commercial and industrial panels, ensuring you won’t sacrifice reliability during critical faults.

• Amperage: 70A
• Poles: 3-Pole
• Voltage: 240V
• Interrupting Rating: 10kA
• Mounting: Bolt-On
• Part Number: Q1B370
• Brand: Square D

Why this design matters in real-world use:

• Secure Bolt-On Mounting: The bolt-on format provides a robust, vibration‑resistant installation that stays put in demanding environments, reducing the risk of loose connections over time.
• Three-Phase Protection: A 3‑pole configuration is ideal for three-phase loads common in motors, compressors, and HVAC equipment, delivering coordinated, balanced protection across all phases.
• Strong Short‑Circuit Protection: A 10kA interrupting capacity ensures rapid, reliable shutdown during fault conditions at 240V, helping safeguard downstream equipment and wiring.
• Exact Compatibility: The Q1B370 designation is your best reference for matching fit with legacy Square D panels that require bolt-on, 3‑pole breakers.

Ideal applications include:

• Maintenance outages and component refreshes in commercial or industrial electrical panels
• Retrofits where older bolt-on breakers are specified or required
• Replacement of worn or damaged 70A, 3‑pole breakers in three-phase distribution systems
• New circuits for heavy‑duty loads that operate at 240V and demand reliable overcurrent protection

Important compatibility notes:

• Confirm fit and ratings before ordering. Part number Q1B370 is the most reliable reference for compatibility.
• Panel compatibility: This is a bolt-on breaker designed for panels that accept bolt-on devices—verify your electrical enclosure labeling and manufacturer guidance.
• Professional installation recommended: To ensure safe operation and code compliance, have a licensed electrician install or verify the breaker in your distribution panel.

Compared to other form factors, this Square D bolt-on breaker is specifically suited for legacy or retrofitted systems where secure mounting and precise three‑phase protection are required. It combines the known reliability of Square D with a fit that’s purpose-built for maintenance and upgrade projects, helping you keep critical equipment protected and outages minimized.

Secure protection for your three-phase load with the Square D Q1B370. A precise fit, durable bolt-on mounting, and solid interrupting capacity make it a practical choice for upgrading or maintaining your electrical distribution with confidence.