Siemens HJD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HJD63B400 — a robust 3-pole bolt-on molded case circuit breaker rated for 400 A at up to 600 V. Engineered for dependable branch circuit protection in panelboards and load centers, it’s built to withstand vibration and harsh operating conditions while delivering precise protection when it matters most.

Why electricians choose HJD63B400

• Secure bolt-on mounting creates a rigid, vibration-resistant connection to the bus, reducing the risk of loose contacts and intermittent trips in environments with equipment vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection against overloads and short circuits across a wide temperature range, helping minimize nuisance trips and protect downstream equipment.
• 3-pole design ensures simultaneous disconnection on all phases, improving safety and compliance in 3-phase systems.
• OEM-compatible designed to work with matching Siemens OEM load centers and panelboards for straightforward replacements and upgrades.
• High-current capability — 400 A at 600 V — making it suitable for large branch circuits and feeder protection in residential, commercial, and light industrial settings.

What problems does it solve?

When you need dependable protection for heavy-duty circuits, the HJD63B400 delivers. The robust bolt-on mount stays secure in vibration-prone spaces, while the thermal-magnetic trip responds to overcurrents and faults quickly, reducing the risk of damage to conductors, devices, and downstream equipment. It’s an ideal choice when upgrading an older panel or provisioning a new panel with higher current demands.

Ideal applications

• Panelboards and load centers in residential upgrades and multi-zone electrical installations
• Commercial electrical rooms serving offices, retail spaces, or light industrial equipment
• Circuits requiring reliable 3-phase protection with a rugged bolt-on design

Technical specifications

• Manufacturer: Siemens
• Part Number: HJD63B400
• 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