Siemens | CJ3S400 | Circuit Breaker | 3-Pole | Bolt-On

Meet Siemens CJ3S400, a robust 3-pole bolt-on circuit breaker designed for reliable protection in industrial electrical systems. Built for maintenance, retrofit, and replacement projects where exact compatibility matters, this unit helps keep panels safe, compliant, and operating with minimal downtime.

What makes it stand out

• 3-Pole bolt-on configuration for secure mounting and true three-phase protection within panel assemblies and distribution boards.
• Precise compatibility via part number CJ3S400—the most dependable reference when matching breakers in Siemens installations or systems that require exact Siemens specifications.
• Practical for multiple scenarios including routine maintenance, panel retrofits, and replacement of aging breakers without changing wiring layouts.
• Important compatibility note Always confirm fit and ratings before ordering to ensure electrical characteristics and mounting footprint align with your equipment.

Ideal for

• Facilities engineers and maintenance teams managing industrial panels that rely on Siemens protection devices.
• Project teams performing retrofits or stocking spare parts for ongoing operations.
• Technicians seeking a dependable, three-phase bolt-on solution that aligns with existing CJ-series or Siemens-compatible systems.

How this model helps in practice

• Using the CJ3S400 as the reference minimizes installation guesswork, reducing downtime caused by incompatible replacements.
• The bolt-on design provides a solid mechanical connection, aiding reliable operation in environments with vibration and constant switching.

Key reminder: The CJ3S400 part number is your best reference for compatibility. Before ordering, verify that the breaker's ratings and mounting footprint match your panel requirements and that the three poles align with your three-phase circuit.