Siemens | JD3B400 | Circuit Breaker | 3-Pole

Introducing the Siemens JD3B400 Circuit Breaker, a reliable 3-Pole solution designed for maintenance, retrofit, and replacement projects where matching specifications matter. This item is identified by the JD3B400 part number, making compatibility checks straightforward and precise within Siemens systems.

Why the Siemens JD3B400 3-Pole breaker stands out

With its three-pole configuration, this breaker delivers coordinated protection for 3-phase electrical networks, helping keep sensitive equipment safe during startups, load changes, and routine operations. The JD3B400 model is specifically chosen when you require a Siemens-approved component that aligns with your existing panel architecture and accessories.

• Three-pole design supports 3-phase circuits, ensuring balanced protection across all phases.
• Part number JD3B400 serves as the most reliable reference for compatibility—verify fit and ratings before ordering.
• Maintenance, retrofit, and replacement oriented—optimized for field service and equipment upgrades within Siemens-compatible systems.
• Clear guidance on compatibility relies on the exact part number to align with your current panels and assemblies.

Ideal use cases

This 3-Pole circuit breaker is an excellent choice for projects that require matching Siemens specifications, such as replacing a worn or failed unit, updating an electrical panel during a retrofit, or maintaining service reliability during routine maintenance. It’s well-suited for environments where precise part compatibility with existing Siemens equipment is essential.

Procurement notes

Before placing an order, confirm the fit and ratings for your specific panel or distribution setup. Rely on the JD3B400 part number as the definitive reference to ensure seamless compatibility with your Siemens system.