Siemens B250 50-Amp Double Pole Breaker 120/240V — Bolt-In, 10KAIC

Overview

The Siemens B250 is a compact, panel-board mounted breaker built to deliver reliable circuit protection for 120/240V systems. Its bolt-in installation helps secure the device within standard enclosures, while the molded-case design contributes to dependable performance in everyday electrical environments.

As a 2-pole, 50 Amp unit in the BL family, it protects two live conductors simultaneously, making it suitable for main or branch circuits that require balanced protection across both legs of a split-phase setup. The fixed trip mechanism provides predictable behavior across installations, helping technicians achieve consistent protection profiles.

Key specifications

• 2-pole, 50 Amp rating
• Operates on 120/240-Volt systems
• Bolt-in mounting for panel boards
• Type BL molded case breaker
• UL Listed for standard electrical installations
• 10KAIC interrupting rating for fault current protection
• Non-interchangeable trip design for consistent performance

Why choose Siemens BL breakers

The BL line is designed to fit directly into common panel boards, reducing the need for panel modifications. The combination of a secure bolt-in fit and a rugged internal mechanism supports steady protection during daily operation and occasional load surges.

Beyond standard protection, Siemens offers a broader BL family that includes arc-fault, ground-fault, and switching neutral variants. This variety lets you expand protection functions without replacing the panel or rewiring, when compatible with your system.

Installation and compatibility tips

For installers, the B250’s panel-board mounting and bolt-in design simplify alignment and seating within the enclosure. Verify the panel's compatibility with Type BL breakers and confirm the 10KAIC rating matches the electrical service and fault current available at the site.

Always follow local electrical codes and manufacturer guidelines. Keep spare breakers within the same family on hand to ensure consistent replacement parts and predictable electrical protection across installations.

Common use cases

• Residential subpanels and main panels requiring reliable two-pole protection
• Retrofit projects where a compact, bolt-in solution is preferred
• Applications needing dependable protection for balanced 120/240V loads