Siemens BQ3B070H - 70 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQ3B070H — a 70A, 240V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. This unit combines rugged reliability with precise protection to keep commercial, residential, and light industrial electrical systems running smoothly.

Key benefits that matter in real use

• Secure bolt-on mounting: a rigid bus connection that minimizes movement and vibration-induced wear, delivering long-term reliability in dynamic environments.
• Thermal-magnetic trip unit: delivers stable, repeatable protection—the thermal element handles overloads, while the magnetic element responds swiftly to short circuits, reducing nuisance trips and protecting equipment.
• OEM loadcenter compatibility: designed to work seamlessly with matching Siemens loadcenters and panelboards, ensuring cohesive performance and simpler upgrades.
• 3-pole design for three-phase systems: ideal for motor loads, HVAC equipment, and other 3-phase circuits common in commercial and light industrial settings.
• Versatile application: suitable for residential, commercial, and light industrial electrical distributions, making it a flexible choice for diverse projects.

Why this breaker matters for your electrical protection

The BQ3B070H provides robust overcurrent and short-circuit protection tailored to panelboard layouts and distribution boards. With its thermal-magnetic trip mechanism, you gain predictable performance under varying loads and ambient conditions, helping to prevent equipment damage and electrical fires. The bolt-on construction adds mechanical robustness, reducing the risk of connection loosening in environments with vibration or movement.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ3B070H
• 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

Ideal use scenarios

• Upgrading or retrofitting 3-phase panels in commercial spaces, small offices, and light industrial facilities.
• Protecting motors and three-phase equipment in HVAC, pumps, and manufacturing auxiliary lines.
• Integrating with Siemens OEM panelboards for consistent electrical performance and streamlined maintenance.

Installation and compatibility tips

Verify that your panelboard is designed to accept bolt-on breakers in the Siemens BQ family. Follow the OEM installation instructions for mounting torque and bus connection to maintain maximum performance. Always pair this breaker with compatible Siemens loadcenters to ensure protection curves and trip characteristics align with your system design. For any project involving three-phase circuits, confirm conductor sizing and protection coordination per local electrical codes to achieve safe, efficient operation.

Upgrade your distribution panel with the Siemens BQ3B070H for reliable 3-phase protection that stands up to vibration, delivers repeatable performance, and integrates smoothly with Siemens panel ecosystems.