Siemens JXD63B300L - 300 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Siemens JXD63B300L — a robust 3-pole molded case circuit breaker engineered for dependable branch circuit protection in panelboards and loadcenters. With a 300A rating and 600V capacity, this unit safeguards three-phase feeds and heavy-load circuits without compromising panel space or reliability.

• Compact molded-case design minimizes footprint in crowded panels, making installation straightforward and allowing more room for field wiring and future expansion.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with magnetic short-circuit response for rapid, decisive interruption when it matters most.
• 3-pole configuration provides true three-phase protection, ideal for commercial or light industrial systems that rely on balanced, coordinated protection across all phases.
• OEM compatibility designed to pair seamlessly with Siemens loadcenters and panelboards, ensuring coordinated protection and reliable performance across your Siemens electrical ecosystem.
• High-capacity protection 300A amperage rating handles substantial feeder loads while the 600V rating supports a range of commercial and light industrial applications.

Designed to protect both people and equipment, the JXD63B300L reduces the risk of nuisance trips while delivering fast response to faults. Its integration with Siemens hardware means easier maintenance, streamlined stocking, and dependable service life in daily operation.

Ideal use scenarios include large residential subpanel feeders, commercial distribution panels, and light industrial equipment feeds where three-phase protection and space efficiency matter most. Use this breaker to safeguard motors, HVAC controls, lighting, and other critical loads where reliable overcurrent and short-circuit protection is essential.

Technical at a glance

• Manufacturer: Siemens
• Part Number: JXD63B300L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Siemens JXD63B300L for a reliable, space-conscious, three-phase protection solution that aligns with your Siemens panel system. Available from AmpState, it’s a solid choice when you need durable, verified protection for demanding electrical layouts.