Siemens JXD22B300L - 300 A, 240 V, 2-Pole Circuit Breaker | AmpState

Siemens JXD22B300L is a rugged 2-pole molded case circuit breaker designed to shield your electrical system from overcurrent and short circuits. Rated at 300A and 240V, it sits in panelboards and load centers, delivering reliable protection for large feeders and critical circuits in residential, commercial, and light industrial settings.

• Compact molded case design minimizes space usage in crowded panels, making it easier to route conductors and fit additional devices.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across temperature changes, reacting quickly to short circuits while reducing nuisance trips from normal load variations.
• 2-pole, 300A, 240V configuration provides robust, coordinated protection for 240V circuits and two-hot-leg feeders.
• OEM-ready compatibility is designed to work seamlessly with matching Siemens load centers and panelboards for a cohesive, dependable distribution system.
• Versatile application suitable for residential, commercial, and light industrial branch-circuit protection.

Technical snapshot

• Manufacturer: Siemens
• Part Number: JXD22B300L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300A
• Voltage Rating: 240V
• Number of Poles: 2
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider the JXD22B300L? contractors and facilities managers upgrading service panels or adding large feeders, electrical engineers designing resilient distribution systems, and maintenance teams seeking reliable, long-term protection for critical loads. It’s ideal for service entrances, subpanels, and load centers where space is at a premium but demand is high.

Why this matters in the real world: you’re protecting expensive equipment, preserving wiring integrity, and reducing downtime from electrical faults. The JXD22B300L delivers precise trip characteristics that align with Siemens’ trusted engineering, helping you maintain system safety and operational continuity across daily use and peak loads.

Practical tips for use: pair this 2-pole breaker with compatible Siemens panelboards to ensure proper bus alignment and trip coordination. Follow manufacturer torque specifications for terminal lugs and verify correct labeling in your electrical diagrams. When planning upgrades, consider the 240V, 300A rating to match your largest feeders and your current electrical code requirements for overcurrent protection.