Siemens S44B 250A Circuit Breaker, NEMA 1 | AmpState

Siemens S44B 250A Circuit Breaker, housed in a rugged NEMA 1 enclosure, is engineered to deliver dependable circuit protection for panelboards, load centers, and electrical distribution systems. Built for everyday electrical work, this breaker is a reliable choice when you need solid performance in indoor, dry environments.

Why this S44B stands out:

• 250 A protection—powerful amperage rating suitable for main feeders and high-demand circuits within commercial or light industrial settings.
• NEMA 1 enclosure—compact, durable construction designed for indoor installations that require solid protection against dust and incidental contact.
• Part number stability—retrofitting or maintenance projects benefit from keeping the exact S44B part number to ensure a seamless fit and consistent electrical characteristics.
• Panel and distribution compatibility—specifically designed to work with Siemens panelboards and load centers, helping preserve mounting, bus connections, and reliability.
• AmpState availability—readily available from AmpState to support timely procurement and project scheduling.

Ideal use cases and scenarios:

• Retrofit projects where maintaining a consistent part number minimizes changes to wiring diagrams, mounting locations, and service documentation.
• Maintenance planning for facilities with existing Siemens infrastructure, ensuring continued compatibility and predictable replacement cycles.
• New installations in indoor electrical rooms or dry locations that require robust, high-capacity protection up to 250 A.

Practical considerations to maximize success:

• Verify the panelboard or load center accepts a 250 A Siemens S44B and that the surrounding enclosure meets your installation’s environmental requirements.
• Cross-check the existing system’s protection scheme to ensure the 250 A rating aligns with upstream protection and desired fault-current coordination.
• If you’re unsure about fit or compatibility, AmpState offers guidance to confirm whether the S44B is the right match for your specific panel and bus configuration.

Ready to add reliability to your electrical distribution? Siemens S44B 250A Circuit Breaker is available from AmpState. If you need help confirming compatibility or matching a part number, message us and we’ll help you verify fit and placement in your system.