Siemens JXD23B350 - 350 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens JXD23B350 is a high-capacity, 350A, 240V, 3-pole bolt-on molded case circuit breaker built to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a rugged bolt-on mounting design, it provides a secure, vibration-resistant bus connection that stays engaged under demanding electrical conditions.

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection for long-term reliability in challenging environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both slow-rising and instantaneous faults, reducing nuisance trips while safeguarding equipment.
• OEM-compatible design pairs seamlessly with matching Siemens loadcenters and panelboards, supporting straightforward installation and reliable performance as a replacement or upgrade.
• Versatile, high-current protection suited for residential, commercial, and light industrial electrical systems that require robust 350A protection without sacrificing space or ease of maintenance.

Technical specifications

• Manufacturer: Siemens
• Part Number: JXD23B350
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 350 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker matters in your panel

When you’re protecting large-draw circuits in residential service panels, commercial distribution boards, or light industrial panels, the JXD23B350 provides a reliable line of defense against overloads and faults. The bolt-on connection minimizes loose contacts that can lead to heat buildup, while the thermal-magnetic trip mechanism adapts to changing load conditions to reduce nuisance trips without compromising safety.

Ideal use cases

• Upgrading or replacing high-amperage branch breakers in load centers and panelboards that require a 350 A rating.
• New installations in applications where space and dependable protection are priorities for large circuits (motors, feeders, or distribution branches).
• Retrofitting commercial or light-industrial panels that demand a rugged, OEM-compatible protective device.

Practical guidance and insights

Choose the Siemens JXD23B350 when you need a single, reliable solution for high-current protection that fits seamlessly with Siemens panel ecosystems. Its bolt-on design simplifies mounting in compatible enclosures, and the thermal-magnetic trip unit helps maintain consistent protection across varying electrical loads. For ongoing maintenance, pair this breaker with compatible Siemens OEM loadcenters to ensure optimum coordination and protective performance across downstream circuits.