Siemens CJD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

For panelboards and load centers that demand robust, reliable protection, the Siemens CJD63B400 delivers. This 400 A, 600 V, 3-pole bolt-on molded-case circuit breaker is built to guard your electrical system against overloads and short circuits with precision and durability.

Key design features

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing movement and wear over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining overload sensing with fast magnetic response for high fault currents.
• 3-pole, 400 A, 600 V ratingDesigned for demanding branch-circuit protection in larger panelboards and load centers.
• OEM-compatible fully compatible with matching Siemens load centers and panelboards for streamlined replacements and serviceability.
• Versatile application suitable for residential, commercial, and light industrial installations that require dependable, code-compliant protection.

Why this matters

In environments where vibrations, electrical noise, or high fault currents are a concern, the CJD63B400’s bolt-on construction minimizes bus-bar movement and connection wear, translating to longer service life and fewer mid-service interruptions. The thermal-magnetic trip unit ensures protective actions are precise and repeatable, helping you maintain selectivity and downstream coordination without nuisance trips.

Use cases and ideal applications

• Large residential service panels requiring 400 A protection with solid, rock-solid mounting.
• Commercial panelboards where reliable short-circuit protection is critical for safety and uptime.
• Light industrial equipment disconnects and distribution boards that benefit from durable bolt-on assemblies.

Available from AmpState, the Siemens CJD63B400 is the trusted choice when you need a rugged, compatible, and consistent protection device for your electrical distribution system. Its combination of secure mounting, precise trip logic, and OEM compatibility makes it a practical upgrade or replacement option for demanding installations.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: CJD63B400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection