Siemens SMBKJD3400 400A 3-Pole 480 V Circuit Breaker

Meet the Siemens SMBKJD3400, a purpose-built circuit breaker engineered for demanding 480 V electrical systems. With a 400 A current rating and a 3-pole configuration, this unit provides robust protection for large feeders and motor circuits in industrial and commercial environments. Built to integrate seamlessly with Siemens panels, the SMBKJD3400 helps ensure reliable, fast fault isolation when it matters most.

Key specifications

• Part Number: SMBKJD3400
• Current rating: 400 A
• Poles: 3
• Voltage rating: 480 V

Why this breaker stands out

Designed to handle high-demand electrical loads, the SMBKJD3400 delivers precise, synchronized protection across all phases of a three-phase system. This reduces the risk of phase imbalances and protects essential equipment from overloads and short circuits. For facilities with large motors, heavy feeders, or critical 3-phase circuits, this breaker provides dependable performance and compatibility within Siemens-based infrastructure.

Ideal use cases

• Industrial motor control centers and large feeders in manufacturing facilities
• Three-phase distribution panels supplying 480 V power
• Equipment rooms and substations where high-current protection is required

Practical considerations

• Verify your panel supports 480 V, 3-pole configurations with a 400 A rating before installation.
• Consult Siemens installation guidelines for torque and termination details to ensure a reliable connection.
• Regularly inspect for signs of overheating, wear, or recent tripping history to maintain optimal protection.

Why choose Siemens for your protection strategy

Siemens engineering stands for reliability and seamless integration with existing Siemens electrical infrastructure. The SMBKJD3400 is a high-capacity, mission-critical solution designed to protect valuable equipment, reduce downtime, and simplify maintenance in demanding 480 V, three-phase environments.