Siemens HLD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HLD63B400 — a rugged 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Sold through AmpState, this unit is engineered for demanding commercial, light industrial, and select residential applications where reliable fault protection and a secure, vibration-resistant connection matter.

Why this breaker stands out

• Secure bolt-on mounting — a rigid bus connection minimizes movement and arcing, delivering long-term reliability in environments with equipment vibration or movement.
• Thermal-magnetic trip unit — combines stable thermal overload protection with fast magnetic response for instantaneous isolation of short circuits, helping minimize downtime and equipment damage.
• 3-pole configuration — ideal for 3-phase systems, providing coordinated protection across all three conductors in commercial and light industrial settings.
• 600 V rating — supports higher voltage circuits while maintaining safe interrupting capabilities for modern electrical installations.
• 400 A rating — designed for feeder protection and main distribution roles where higher fault currents are expected.
• OEM compatibility — engineered to be compatible with matching Siemens load centers and panelboards for a seamless, plug-and-play replacement or upgraded installation.

Ideal for electricians, facilities managers, and panel installers who need a robust, high-capacity breaker that fits Siemens-compatible panel systems. Use cases include feeder protection for commercial distribution panels, protection for 3-phase equipment racks, and panelboard modernization projects where reliability and easy maintenance are priorities.

What problems does it solve?

• Prevents cascading damage from short circuits with fast magnetic tripping, reducing repair costs and downtime.
• Eliminates loose or intermittent connections thanks to secure bolt-on mounting, extending breaker life and reducing maintenance checks.
• Ensures consistent protection across all three phases, crucial for balanced loads in business-critical applications.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HLD63B400
• 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

Choose the Siemens HLD63B400 for a dependable, high-capacity protective solution that aligns with Siemens panel products and offers predictable performance in real-world conditions. It’s the smart, durable choice for safeguarding electrical systems where downtime isn’t an option.