Siemens | CKL3B400 | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Siemens CKL3B400 circuit breaker — a rugged, three-pole protection device engineered for heavy-duty electrical systems. With a 400 A rating and a 600 V maximum, this Siemens part is built to handle demanding service conditions while ensuring reliable, coordinated protection across all three phases.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole (three-phase)
• Voltage: 600 V
• Part number: CKL3B400
• Intended use: maintenance, retrofit, and replacement
• Compatibility note: Confirm fit and ratings before ordering. The part number CKL3B400 is the best reference for compatibility.

Why this matters for your system

The CKL3B400’s three-pole design ensures simultaneous disconnection of all phases, protecting downstream equipment and reducing the risk of unbalanced loads. When sourced as part of Siemens’ ecosystem, it offers consistent behavior with other breakers, helping you maintain coordinated protection across your distribution panels and motor feeders. This makes it a reliable choice for retrofit projects where exact specifications are required to match existing infrastructure.

Ideal use cases

• Replacing a failed or outdated breaker in Siemens panels that require a 3-Pole, 400 A, 600 V device
• Retrofit projects on industrial lines or manufacturing equipment where higher current protection is needed
• Upgrading electrical distribution in service panels or motor control centers that demand robust three-phase protection

Compatibility and installation guidance

Before purchasing, verify that your panel or enclosure accepts a 3-Pole, 400 A, 600 V breaker like the CKL3B400. Use CKL3B400 as the primary reference to ensure compatibility with your existing infrastructure. Follow standard electrical installation practices: disconnect power before work, relate the breaker to the panel’s ratings, and confirm secure termination and proper clearance for safe operation. For best results, match this breaker to the Siemens lineup already in use in your system to maintain consistent protection characteristics.