Siemens NFK3B100L - 100 A, 3-Pole Circuit Breaker | AmpState

Meet the Siemens NFK3B100L, a 100A, 3-pole molded-case circuit breaker designed to guard your panelboards and load centers from overcurrent and short-circuit faults. Offered by AmpState, this unit combines precise protective performance with a compact footprint, making it a smart choice for modern electrical installations where space matters.

• Compact molded-case design saves valuable panel space and simplifies installation in crowded panels, helping you maximize the usable area inside your electrical enclosure.
• Thermal-magnetic trip unit delivers stable, repeatable protection by pairing a thermal element for overload protection with a magnetic element for instantaneous response to short circuits.
• 3-pole construction ensures all three poles trip together, providing safe and coordinated disconnection for 3-phase circuits.
• OEM compatibility designed to work with matching Siemens load centers and panelboards, ensuring proper fit, electrical coordination, and reliable performance.
• Versatile application suitable for residential, commercial, and light industrial settings, protecting feeders and branch circuits from faults and unexpected outages.

Technical snapshot

• Manufacturer: Siemens
• Part number: NFK3B100L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 100 A
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Upgrading residential panels that require robust 100 A protection for main feeders or critical branch circuits.
• Commercial office spaces and light retail environments needing reliable 3-phase protection with compact panel footprint.
• Light industrial setups where limited panel space necessitates an efficient, space-saving breaker without compromising protection.
• Replacement in Siemens OEM panelboards and load centers to maintain electrical coordination and safety standards.

Why choose the Siemens NFK3B100L? It combines a space-saving design with a proven thermal-magnetic protection mechanism that reduces nuisance trips while providing fast, decisive responses to faults. By pairing with Siemens panelboards, it ensures proper fit and consistent performance across installations. When you specify a 100 A, 3-pole protection device, you’re opting for a reliable, industry-aligned solution engineered for durability and ease of maintenance in real-world electrical environments.

Installation and care tips

• Verify panelboard compatibility with Siemens OEM load centers before installation to ensure proper coordination.
• Follow all local electrical codes and manufacturer instructions for installation, termination torque, and safety procedures.
• Use only with conductors and accessories rated for 100 A and appropriate for 3-pole molded-case breakers.