Square D QOB3701021 70A 3P 240V Circuit Breaker, Bolt-On, Shunt Trip | AmpState

Introducing the Square D QOB3701021 - a dependable 70 A, 3-pole, 240 V bolt-on circuit breaker with shunt trip designed for everyday electrical work. Built to protect panelboards, load centers, and electrical distribution networks, it keeps your system safe and compliant while simplifying replacement in retrofit projects.

• 70 Amp, 3-Pole, 240 Volt rating ensures robust protection for multiwire circuits and feeders.
• Bolt-On mounting provides solid, quick installation in compatible Square D panelboards and distribution panels.
• Shunt Trip capability enables remote disconnection through an external control circuit for enhanced safety and emergency isolation.
• Part of the Square D QOB family with proven performance in retrofit and maintenance planning where part-number consistency matters.
• Reliable compatibility for panelboards, load centers, and electrical distribution setups needing a trusted 70 A breaker.

Key use cases and benefits:

• Retrofit projects: keep the same part number (QOB3701021) across aging panels to reduce inventory complexity and downtime.
• Maintenance planning: stock and swap in the same model when scheduled service is on the horizon.
• Remote control and safety: integrated shunt trip supports code-compliant emergency isolation in protected circuits.
• Electrical distribution: suitable for feeders and branch circuits in commercial or industrial environments requiring 240 V 3-pole protection.

Installation and compatibility notes:

Designed for bolt-on installation in compatible panelboards and load centers from Square D. Before purchase, verify that your enclosure accepts QOB-series breakers and that the bus configuration supports a 3-pole, 240 V shunt-trip device. If you need help confirming fit or part-number compatibility, AmpState is ready to assist—message us and we’ll confirm the right fit for your system.

With AmpState, you’re getting a trusted source for essential electrical components. The Square D QOB3701021 is a purpose-built solution for reliable circuit protection, retrofits, and long-term maintenance planning—delivering predictable performance when it matters most.