Siemens CLD63B500 - 500 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens CLD63B500, a rugged 3-pole bolt-on molded case circuit breaker engineered to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Rated at 500 A and 600 V, this unit is designed to handle demanding electrical environments while preserving system stability and safety. Available from AmpState, it’s a trustworthy upgrade or replacement for Siemens OEM panels that require a solid, compatible solution.

Why the CLD63B500 stands out

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays tight through equipment movement, reducing the risk of loose connections and intermittent trips.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining a heat-based overload element with a magnetic short-circuit trigger, enabling fast, reliable clearance when faults occur.
• OEM-compatible design engineered to match Siemens load centers and panelboards, simplifying installation, replacement, and long-term maintenance without compatibility surprises.
• Three-pole configuration, ideal for three-phase systems and higher-demand circuits common in commercial and light industrial settings.
• Purpose-built for protection specifically aimed at safeguarding branch circuits from overcurrent and short circuits, helping to prevent damage to wiring and equipment.

Ideal use cases

• New installations in panelboards and loadcenters that require robust 3-pole protection for large loads or three-phase equipment.
• Repairs or replacements in residential, commercial, and light industrial environments where Siemens-compatible protection is essential.
• Upgrading aging protection to a high-capacity breaker that maintains reliable trip performance under varying load conditions.

What makes this breaker practical for your project

• Streamlined compatibility with Siemens OEM components minimizes integration hassles and helps maintain overall panel performance.
• The bolt-on mounting method provides a durable, vibration-resistant connection—crucial in mechanical rooms, HVAC closets, and equipment rooms where movement occurs.
• The combination of thermal and magnetic trip mechanisms reduces nuisance trips while delivering prompt response to short circuits, protecting both conductors and connected equipment.
• Designed to support clear, straightforward replacement in existing installations, helping you complete projects faster with fewer compatibility concerns.

Technical snapshot

• Manufacturer: Siemens
• Part Number: CLD63B500
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 500 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

In practical terms, the Siemens CLD63B500 is the reliable backbone for protecting large feeders and critical circuits in multi‑space panelboards. Its sturdy bolt-on design means fewer loosened connections over time, while the thermal-magnetic trip unit responds appropriately to both overloads and faults, helping you maintain continuous operation with confidence. Choose this breaker when you need a compatible, high-capacity solution that aligns with Siemens panel ecosystems and delivers predictable protection in demanding residential, commercial, and light industrial applications.