Siemens B370 - 70 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens B370 — a 70A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit protection in panelboards and load centers. With a focus on reliable operation in residential, commercial, and light industrial settings, this breaker provides robust protection where it matters most.

Why the Siemens B370 stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant bus connection, reducing the risk of loose contacts and ensuring consistent performance in panels subjected to movement or vibration.
• Thermal-magnetic trip unit combines thermal overload protection with magnetic short-circuit protection for fast, stable, repeatable response to faults.
• 3-pole design at 70A, 240V supports three-conductor circuits and ensures all poles disconnect together for enhanced safety.
• OEM-compatible engineered to be compatible with matching Siemens OEM load centers and panelboards, facilitating straightforward upgrades or replacements.
• Versatile protection ideal for residential distribution, commercial equipment rooms, and light industrial panels where reliable circuit protection is essential.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: B370
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70 A
• Voltage Rating: 240 V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical applications and benefits: In homes upgrading to sturdy service panels, in commercial distribution rooms, or in light industrial environments, the Siemens B370 provides precise fault sensing and dependable protection against overloads and short circuits. The bolt-on design ensures a solid bus connection under varying load and environmental conditions, while the thermal-magnetic trip unit delivers predictable protection aligned with real-world electrical patterns.

Tips for optimal use: pair the B370 with the appropriate Siemens load center or panelboard, follow standard electrical safety practices, and torque mounting hardware per your panel’s guidelines to maintain the integrity of the bus connection. If replacing an older device, confirm that the B370’s trip characteristics meet your panel’s protection requirements and that wiring gauges and 240V ratings are suitable for the intended load.