Siemens NFK3B250L - Circuit Breaker | AmpState

The Siemens NFK3B250L molded case circuit breaker is engineered to protect your electrical system with precision in panelboards and loadcenters. Designed for reliable branch circuit overcurrent and short-circuit protection, this breaker blends compact sizing with dependable performance for a wide range of installations.

Why the NFK3B250L stands out

• Compact molded case design maximizes panel space, making it ideal for installations where space is at a premium while still delivering robust protection.
• Thermal-magnetic trip unit provides stable, repeatable protection. The thermal element responds to gradual overloads, while the magnetic element swiftly trips on short circuits, reducing nuisance trips and safeguarding wiring and devices.
• OEM compatibility is built around seamless integration with matching Siemens loadcenters and panelboards, ensuring straightforward replacements and reliable system coordination.
• Versatile application range suitable for residential, commercial, and light industrial environments, delivering consistent protection across diverse electrical demands.

What this means for your electrical system

With the NFK3B250L, you’re choosing a protective device that not only blocks harmful surge and fault currents but also maintains predictable performance across varying temperatures and load conditions. The result is fewer unexpected trips, safer circuits, and smoother operation of your panels and connected equipment.

Use cases and practical benefits

• Panelboard upgrades - modernize protection in existing Siemens panelboards with a matching, plug-in compatible breaker to restore optimal protection without extensive rework.
• New installations - deploy in residential or light commercial panels where compact form factors free up space for wiring and future expansion.
• Spare protection - keep on hand as a ready-to-install solution for quick response to wiring updates or small-scale commercial projects.
• Reliability-centric projects - choose when stable, repeatable trip characteristics are essential to safeguard sensitive loads and equipment.

Technical snapshot

• Manufacturer: Siemens
• Part Number: NFK3B250L
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Designed for installers who demand dependable protection without sacrificing panel space or compatibility, the Siemens NFK3B250L delivers precise trip performance and straightforward integration with Siemens OEM loadcenters and panelboards. Whether you're upgrading a panel, expanding a commercial space, or stocking a reliable spare, this molded case breaker provides the protection you can trust for years of steady operation.