Siemens JXD23B300 - 300 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens JXD23B300 is a 300A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver robust branch-circuit overcurrent and short-circuit protection in panelboards and load centers.

Built for reliability in demanding installations, this unit features a secure bolt-on mounting that creates a rigid, vibration-resistant bus connection, helping maintain a clean, low-impedance path for fault currents even in vibration-prone environments.

Its thermal-magnetic trip unit combines precise overload sensing with rapid magnetic tripping for dependable protection that remains stable and repeatable across loads and temperatures. That means fewer nuisance trips and quicker response when a fault occurs, safeguarding wiring and equipment.

Designed to integrate seamlessly with matching OEM Siemens load centers and panelboards, the JXD23B300 ensures proper fit, accurate field coordination, and compliant performance within your existing electrical infrastructure.

Key advantages

• Secure bolt-on mounting: maintains a rigid, vibration-resistant bus connection for durable, long-term performance.
• Thermal-magnetic trip unit: provides stable overload protection with fast short-circuit interruption for reliable, repeatable protection.
• OEM-compatible: ensures seamless integration with Siemens panelboards and load centers.
• 3-pole design at 240V: ideal for three-phase distribution systems in commercial and light industrial settings.
• 300A rating: suited for high-demand branch circuits needing substantial protection.
• Versatile applications: suitable for residential, commercial, and light industrial electrical systems.

Practical use cases

• Three-phase motor feeders in small manufacturing or processing lines requiring solid protection and reliable trip performance.
• Main or feeder protection in commercial electrical rooms where panelboard reliability is critical.
• Sub-panel protection for large homes or multi-tenant facilities with elevated electrical loads.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: JXD23B300
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 300A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

For professionals who demand dependable protection and straightforward compatibility, the Siemens JXD23B300 delivers precise coordination with Siemens panelboards, robust mechanical mounting, and a proven thermal-magnetic protection profile that keeps critical circuits safe and up and running.