Siemens HLD63B300 - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HLD63B300 — a rugged, 3-pole bolt-on molded case circuit breaker engineered to safeguard branch circuits in panelboards and loadcenters. Rated at 300 A and 600 V, this unit delivers dependable overcurrent and short-circuit protection for demanding residential, commercial, and light industrial installations. Available from AmpState, it’s built for installers who demand a secure, long-lasting connection in challenging environments.

• Bolt-on mounting provides a rigid, vibration-resistant bus connection that stays secure even in areas with equipment movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining a thermal overload element with a magnetic short-circuit trigger for rapid response.
• 3-pole design suited for 3-phase power distribution, with a 600 V rating to accommodate modern commercial and industrial electrical systems.
• OEM compatibility with matching Siemens panelboards and loadcenters simplifies installation and ensures coordinated performance.
• Versatile applications ideal for residential feeders, commercial power distribution, and light industrial circuits where reliable protection is critical.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HLD63B300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker matters in real-world setups:

• In crowded electrical rooms or vibration-prone environments, the bolt-on connection minimizes loosening and maintains consistent protection.
• The thermal-magnetic trip provides a clear, predictable response to overloads and short circuits, helping protect wiring, devices, and downstream equipment.
• With OEM compatibility, it’s a reliable replacement or upgrade option for Siemens panelboards and loadcenters, reducing compatibility concerns during installation.
• Ideal for service panels that require a robust 300 A protection point for large feeders or distribution circuits without sacrificing safety or compliance.

Whether you’re upgrading an existing installation or specifying parts for a new commercial or light industrial project, the Siemens HLD63B300 delivers trusted performance, straightforward bolt-on installation, and long-term reliability. Equip your panelboard with this dependable, high-capacity breaker and safeguard your power infrastructure with confidence.