Siemens JXD63B350 - 350 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens JXD63B350 is a 350A, 600V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Available through AmpState, this device combines Siemens reliability with a mounting system engineered for long-term, vibration-resistant service in demanding electrical environments.

• provides a secure, rigid connection to the panel bus, reducing movement and ensuring consistent electrical contact even in equipment subject to vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by using a thermal element for overload conditions and a magnetic element for instantaneous short-circuit trips, helping to prevent nuisance trips and protect sensitive equipment.
• OEM panel compatibility is designed to align with matching Siemens loadcenter and panelboard architectures, enabling straightforward replacements or upgrades without sacrificing coordination or performance.
• Three-pole configuration supports three-phase circuits, making it ideal for commercial and light industrial applications where balanced, reliable power distribution is essential.
• High-current, high-voltage rating—350A at 600V—providing robust protection for main and feeder circuits in a variety of installations.

This molded case circuit breaker is specifically suited for residential service panel upgrades, commercial distribution panels, and light industrial equipment enclosures where secure mounting, precise protection, and OEM-panel compatibility matter most. The JXD63B350 helps you maintain safe, code-compliant operation across your electrical system, with protection that responds quickly to short circuits while smoothly handling normal load conditions.

Technical snapshot: Manufacturer — Siemens; Part Number — JXD63B350; Type — Thermal-magnetic molded case circuit breaker; Amperage Rating — 350A; Voltage Rating — 600V; Number of Poles — 3; Mounting Style — Bolt-on; Application — Branch circuit overcurrent and short-circuit protection.