Siemens HLD63B300L - 500 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Siemens HLD63B300L — a 500A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Manufactured by Siemens and available from AmpState, this device combines heavy-duty performance with a secure mounting system to withstand vibration and harsh environments.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for long-term reliability.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both sustained overloads and instantaneous short circuits.
• 3-pole configuration is ideal for three-phase systems up to 600V, reducing wiring complexity and enabling coordinated protection across phases.
• 500A current rating supports high-demand feeders and larger equipment without nuisance tripping.
• OEM-compatible design ensures seamless compatibility with matching Siemens load centers and panelboards for straightforward upgrades and maintenance.
• Versatile application suited for residential, commercial, and light industrial electrical distributions that require robust overcurrent and short-circuit protection.

Practical use cases

• Upgrading a main feeder or heavy-load circuit in a Siemens-compatible panelboard where high-current protection is essential.
• Protecting three-phase equipment in small to medium commercial installations and light industrial panels.
• Replacing aging or worn-out breakers in OEM panels with a like-for-like Siemens solution to maintain system reliability.

How it protects your system

The HLD63B300L’s thermal-magnetic trip mechanism balances sensitivity and selectivity. The thermal element responds to prolonged overloads, minimizing nuisance trips during steady loads, while the magnetic element detects high-magnitude fault currents for rapid disconnection. This combination helps shield wiring, motors, transformers, and connected loads from damage and fire risk, while preserving power to unaffected circuits.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: HLD63B300L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 500A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection
• Availability: AmpState delivery for Siemens original equipment breakers

Compatibility and installation notes

Specifically designed to work with matching Siemens OEM load centers and panelboards, the HLD63B300L offers a reliable upgrade path and consistent protection across your distribution system. When installing, ensure your panelboard is rated for the 500A, 3-pole configuration and that the bus connection is securely fastened with the bolt-on mounting method to maintain optimal electrical contact and minimize vibration-induced wear.