Siemens SMBKFD3 - 250 A, 600 V, 3-Pole Circuit Breaker | AmpState

Siemens SMBKFD3 is a 3-pole molded case circuit breaker rated 250A at 600V, engineered to protect branch circuits in panelboards and load centers with dependable, repeatable performance. When you need robust overcurrent and short-circuit protection for commercial or light-industrial distributions, this unit delivers with precise protection and compact design.

• Space-efficient molded case design: Optimizes panel real estate, leaving room for essential circuits and easier future expansion.
• Thermal-magnetic trip unit: Combines thermal overload protection with an instantaneous magnetic trip for fast, predictable responses to faults and overloads.
• Three-pole configuration (3P): Provides reliable protection for 3-phase distribution, ideal for modern commercial and light-industrial systems.
• OEM panelboard compatibility: Specifically engineered to mount and operate with matching Siemens OEM load centers and panelboards, ensuring proper fit, bus alignment, and seamless integration.
• Broad applicability: Suitable for residential, commercial, and light-industrial panels where a 600V class breaker is required.

Technical snapshot

• Manufacturer: Siemens
• Part Number: SMBKFD3
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 250A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Upgrading a commercial panelboard to centralize protection for a 3-phase distribution with a 250A main feed.
• Replacing aging or incompatible breakers in load centers that require a Siemens SMBKFD3 3-pole protection solution.
• Designing a compact, space-efficient distribution setup in small industrial facilities with 600V equipment.
• Safely interrupting fault conditions across HVAC, lighting, and motor loads on 3-phase circuits within panelboards.

The SMBKFD3 combines a compact form factor with a reliable thermal-magnetic trip mechanism, delivering predictable protection and long-term reliability. For installations that demand a precise 3-pole 250A 600V solution that fits Siemens OEM panelboards, this breaker offers a targeted, high-value answer—helping you protect wiring, equipment, and personnel while keeping your electrical distribution efficient and up to code.