Siemens BQ3B070 - 70 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQ3B070 — a 70A, 240V, 3-pole bolt-on molded case circuit breaker designed to safeguard panelboards and load centers with precision and reliability. Built for demanding environments, this breaker ensures dependable branch circuit protection against overcurrent and short circuits while delivering a rock-solid connection under vibration and load fluctuations.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays seated in challenging electrical panels.
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overloads and short-circuit events, reducing nuisance trips and enhancing safety.
• 3-pole, 70A, 240V configuration ideal for three-phase systems and higher-capacity branch circuits in residential, commercial, and light industrial settings.
• OEM panel compatibility designed to work seamlessly with matching Siemens OEM load centers and panelboards for reliable integration.
• Versatile application suitable for protecting feeders and branch circuits in a variety of installations—from new builds to panel upgrades.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ3B070
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why choose the Siemens BQ3B070? It’s built for durability and accuracy in real-world panels. The bolt-on design simplifies installation and maintenance, while the thermal-magnetic trip mechanism delivers fast, dependable protection that protects both wiring and connected equipment. Whether you’re wiring a residential panel, a commercial service entrance, or a light industrial distribution center, this 3-pole breaker provides the reliable fault protection your system demands.

Use cases include upgrading older panels to meet today’s safety standards, expanding a panel with high-demand circuits, or replacing failed breakers in compatible Siemens load centers. With its precise trip characteristics and solid mechanical build, the BQ3B070 helps maintain electrical reliability across daily operations and critical loads.