Siemens JXD63B300H - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens JXD63B300H—a rugged, 3-pole bolt-on molded case circuit breaker engineered to protect your electrical system from overcurrent and short circuits. With a robust 300A rating and a 600V capacity, this unit is built to perform reliably in demanding panelboards and load centers across residential, commercial, and light industrial settings.

What makes it stand out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, maintaining consistent electrical continuity even in challenging installation environments.
• Thermal-magnetic trip unit provides stable, repeatable protection by accurately responding to both overloads and short circuits, reducing nuisance trips and downtime.
• OEM compatibility is designed to work seamlessly with matching Siemens panelboards and load centers, simplifying replacements and service work.
• 3-pole design ensures balanced protection across three-phase systems, ideal for modern commercial and light-industrial power layouts.
• 600V rating supports higher-voltage branch circuits, expanding its versatility for varied installations.

Ideal for

• Electrical contractors replacing or upgrading Siemens panelboards and load centers.
• Facilities managers overseeing residential, commercial, and light industrial electrical systems.
• Projects requiring a dependable, bolt-on MCCB with OEM-grade reliability and performance.

Why choose this model

The JXD63B300H isn’t just another breaker—it’s purpose-built to protect critical circuits with precision and durability. Its bolt-on mounting and environment-ready construction minimize installation hassles and vibration-related wear, while the thermal-magnetic trip unit delivers predictable behavior under a wide range of fault conditions. That means fewer unexpected trips, faster restoration, and safer operation in everyday panelwork.

Technical specifications

• Manufacturer: Siemens
• Part number: JXD63B300H
• Type: Thermal-magnetic molded case circuit breaker
• Current rating: 300A
• Voltage rating: 600V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical notes for installation and use

Use this breaker in Siemens-compatible panelboards and load centers to ensure optimal fit and performance. The bolt-on design requires appropriate mounting hardware and alignment with the panel’s bus connections, so follow OEM installation guidance for secure, vibration-resistant operation. With its 300A rating and 600V capability, the JXD63B300H is a ready-made solution for upgrading legacy panels or configuring new, code-compliant electrical distributions in commercial spaces and light industrial environments.

AmpState offers genuine Siemens JXD63B300H units to ensure authentic performance and long-term reliability in your electrical infrastructure. If you’re upgrading or conducting routine maintenance, this breaker provides the dependable protection your circuits demand.