Siemens JXD23B400 - 400 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens JXD23B400—a rugged, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to handle higher-current applications, this bolt-on unit pairs robust construction with precise, repeatable trip performance for peace of mind in demanding environments.

• Secure bolt-on mounting: A rigid connection to the bus minimizes vibration and maintains uninterrupted contact, even in panels subjected to movement or vibration.
• Thermal-magnetic trip unit: Combines steady thermal protection with fast magnetic trip for instantaneous response to short circuits, reducing the risk of damage to downstream equipment.
• High-current capability: 400A current rating at 240V makes this breaker ideal for main feeders or high-demand branch circuits in commercial and light industrial settings.
• 3-pole design: Suitable for three-phase systems, ensuring balanced protection across all phases in a panelboard or loadcenter.
• OEM compatibility: Specifically designed to work with matching Siemens OEM load centers and panelboards for seamless integration and reliable performance.
• Versatile applications: Ideal for residential-commercial-light industrial installations where robust, long-term protection is essential.

The Siemens JXD23B400 is a practical solution for safeguarding critical electrical infrastructure against overcurrent and short circuits. Its bolt-on format provides a secure, vibration-resistant connection to the bus, while the thermal-magnetic trip unit delivers stable, repeatable protection—so you can rely on consistent performance day after day. Whether upgrading an existing Siemens panelboard or outfitting a new installation, this 400A, 240V, 3-pole breaker ensures compliant, dependable protection for high-demand circuits.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: JXD23B400
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 400A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re stocking a new panel installation, performing a panel upgrade, or replacing a worn-out breaker in a Siemens-compatible system, the JXD23B400 delivers the reliable protection you expect—with the durability to handle the demands of today’s electrical installs.