Square D QOB170 - 70 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Protect essential circuits with precision and confidence using the Square D QOB170 70A, 120V, 1-Pole Bolt-On Circuit Breaker. Engineered for dependable branch circuit overcurrent and short-circuit protection, this molded‑case breaker is designed to stand up to the demands of residential, commercial, and light industrial installations while delivering consistent performance in panelboards and loadcenters.

Why the QOB170 stands out

• Secure bolt-on mounting provides a rigid, vibration‑resistant bus connection, reducing the risk of loose connections that can lead to nuisance trips or arcing.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying temperatures and loads, with rapid magnetic response to short circuits for immediate protection.
• 1-pole, 70A, 120V configuration is ideal for protecting single‑phase branch circuits that demand higher current capacity without compromising safety.
• OEM-compatible design ensures reliable fit and coordination with matching Square D load centers and panelboards for seamless replacements or upgrades.
• Durable molded‑case construction built to endure the rigors of everyday electrical service in diverse environments.

Who is this for?

Perfect for electricians and facilities managers tackling panelboard maintenance, electrical renovations, or new installations where a robust 70A protection device is needed. Suitable for residential subpanels, commercial distribution, and light industrial applications where dependable overcurrent and short‑circuit protection matters most.

Use cases and practical applications

• Replacing a failed or aging 1‑pole breaker in a panelboard or loadcenter that requires 70A protection at 120V.
• Feeding higher‑demand branch circuits for workshops, garages, or HVAC controls while preserving system safety.
• Installing in new or upgraded electrical panels where bolt‑on mounting and secure bus connections are priorities.

What makes it different from generic breakers

The QOB170 combines bolt-on reliability with a thermal-magnetic trip system tuned for predictable protection, all from a trusted Square D lineage. Its matching OEM compatibility means fewer fitment surprises and smoother panel integration, helping you achieve code‑compliant, long‑lasting protection without aftermarket guesswork.

Technical specifications

• Manufacturer: Square D
• Part Number: QOB170
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Square D QOB170 for a dependable, code‑ready solution that protects your circuits with precision while delivering a straightforward, long‑lasting installation experience.