Siemens HJXD63B400L - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HJXD63B400L — a robust, bolt-on molded case circuit breaker engineered to protect your electrical distribution with precision. Rated at 400A and 600V, this 3-pole device is built to safeguard panelboards and loadcenters from overcurrent and short circuits in everyday residential, commercial, and light industrial settings.

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact and reliable trip performance even in environments with movement or vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection: thermal for steady overcurrent control and magnetic for fast response to short-circuit events, reducing downtime and electrical wear.
• OEM-compatible design is tailored to work with matching Siemens OEM load centers and panelboards, ensuring a clean fit and straightforward installation.
• High-current versatility with a 400A rating makes it suitable for larger branch circuits and main distribution needs in both small and expanding electrical systems.
• Three-pole configuration supports three-phase circuits, ideal for commercial and light-industrial power distribution while still serving demanding residential installations where three-phase service is present.

Why this breaker stands out: it combines a secure physical connection with a precise protective mechanism that adapts to real-world conditions. The bolt-on style isn’t just about mounting—it’s about long-term reliability in panelboards and loadcenters where space is tight and protection must be dependable year after year.

What you can use it for

• Protecting large branch circuits in residential service panels, multi‑family dwellings, or subpanels that rely on solid, vibration-tolerant connections.
• Serving as a main or feeder protection device in commercial or light industrial distribution where three-phase power is present.
• Replacing aging or worn breakers in compatible Siemens panelboards to restore consistent overcurrent and short-circuit protection.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HJXD63B400L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

For installers and facility managers, this HJXD63B400L breaker provides a reliable, compatible upgrade path that aligns with Siemens’ panelboard ecosystems. It’s designed to deliver precise protection when you need it most, helping you maintain safe, uninterrupted electrical service across a range of building types and load profiles.