Siemens | JD2B400 | Circuit Breaker | 400A | 2-Pole | 240V | 65kA

Introducing the Siemens JD2B400 circuit breaker — a rugged 400A, 2-pole device engineered for demanding commercial and industrial electrical systems. Designed for 240V circuits with a robust 65 kA short-circuit current rating, it delivers reliable protection where you need it most. When you're performing maintenance, retrofit, or replacement, this unit matches exact specifications to keep your panel configuration protected and compliant.

Key specifications at a glance

• Amperage: 400A
• Poles: 2-Pole
• Voltage: 240V
• Interrupting rating: 65kA
• Part reference: JD2B400 — best reference for compatibility

Why choose the Siemens JD2B400? This breaker provides a precise trip characteristic suitable for coordinating with other protection devices in a main distribution panel or motor control setup. The 2-pole design ensures both live conductors are simultaneously de-energized, enhancing safety and easing downstream coordination during faults or maintenance.

Ideal use cases — use this JD2B400 where you need a confirmed 400A protection point in 240V circuits: replacement in aging panels, retrofit projects that require upgrading to higher protection levels, or maintenance scenarios where exact part matching is essential to avoid compatibility issues.

Compatibility and installation tips — always confirm fit and ratings before ordering. Use the JD2B400 part number as the primary reference to ensure compatibility with your panel or switchgear. Handle with standard electrical safety practices, verify conductor sizing, and ensure the enclosure rating and bus configuration align with this unit's specifications.