Siemens SCJD6B400LI - 400 A, 3-Pole Circuit Breaker | AmpState

Siemens SCJD6B400LI 400A, 3-Pole Molded Case Circuit Breaker — the reliable backbone for branch circuit protection in panelboards and load centers. Offered through AmpState, this 400A, three-pole unit is purpose-built for demanding commercial, light industrial, and residential installations that require steady protection against overcurrent and short circuits.

• Thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and temperatures, reducing nuisance trips while maintaining fast response when a fault occurs.
• Compact molded case design maximizes panel space, making it easier to fit high-current protection into tighter enclosure footprints without sacrificing performance.
• OEM compatibility designed to pair with matching Siemens panelboards and load centers, ensuring seamless integration, wiring, and field serviceability.
• Three-pole configuration supports 3-phase systems, a common requirement for commercial and light industrial electrical distributions.
• Specific application ideal for protecting branch circuits in panelboards and load centers, providing a reliable line of defense against overloads and short-circuit conditions.

Technical snapshot

• Manufacturer: Siemens
• Part Number: SCJD6B400LI
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Who is this for? Electrical contractors, facilities managers, and system integrators who design, install, or service Siemens-based electrical systems will benefits from the SCJD6B400LI’s precise trip characteristics and dependable performance. It’s well-suited for commercial spaces such as office suites, retail environments, and light industrial facilities, as well as large residential developments requiring robust three-phase protection.

Why choose this unit over generic alternatives? The combination of a thermal-magnetic trip mechanism with a compact form factor and OEM-compatible design delivers predictable protection and straightforward maintenance within Siemens ecosystem environments. That means fewer compatibility issues during installation, faster replace-and-upgrade cycles, and more consistent performance across daily operational fluctuations.

Practical tips for use: - Verify panel compatibility with Siemens OEM load centers to ensure smooth installation. - Plan for 3-phase distribution needs in commercial and light industrial layouts to leverage the 3-pole configuration effectively. - Use as a primary or feeder protection point in panelboards where space is at a premium, thanks to the unit’s compact molded case design.