Siemens | SMBKJD3 | Circuit Breaker | 400A | 3-Pole

Introducing the Siemens SMBKJD3 Circuit Breaker — a rugged 400A, 3-Pole solution designed to safeguard demanding three‑phase electrical systems. Built for maintenance, retrofit, and replacement tasks, this unit helps you restore reliable protection without compromising compatibility or performance.

Why choose the SMBKJD3 for your service needs

• Exact compatibility: The SMBKJD3 part number is the most reliable reference when matching breakers to your panel or distribution setup, ensuring a seamless fit and consistent protection characteristics.
• High‑capacity protection: With a 400 A rating, this breaker is tailored for heavy feeders and substantial loads in commercial and industrial environments, helping prevent overcurrent scenarios that can trigger costly downtime.
• Three‑pole reliability: A true 3‑pole design protects all three phases evenly, reducing the risk of imbalanced loads and ensuring coordinated tripping across phases.
• Maintenance‑friendly and retrofit ready: Designed to simplify field replacement and system upgrades, so you can restore performance with minimal disruption.

Key specifications at a glance

• Amperage: 400 A
• Poles: 3‑Pole
• Part number: SMBKJD3

Ideal use cases

• Maintenance: replace a failed or worn‑out breaker in a 3‑phase distribution panel with an exact spec match.
• Retrofit: upgrade aging protection to a robust 400 A, 3‑pole solution in commercial or light industrial installations.
• Replacement: restore original protection architecture by using the identical SMBKJD3 part number for compatibility and labeling consistency.

Fit, installation, and compatibility tips

Before ordering, verify that the SMBKJD3 matches your panel’s specifications and ratings. The part number is your best reference for compatibility, helping ensure proper bus connection, mounting style, and trip characteristics. When installing, follow standard electrical safety practices, confirm tight terminal connections, and align with your panel’s accepted overcurrent protection standards to maintain system safety and performance.

Note: Confirm fit and ratings before purchasing. The part number SMBKJD3 is the most reliable reference to ensure compatibility with your existing Siemens panels and equipment.