Siemens JXD22B400 - 400 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens JXD22B400 - 400A, 240V, 2-Pole Bolt-On Molded Case Circuit Breaker is engineered to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a secure bolt-on mounting and a thermal-magnetic trip unit, this breaker stays fixed in place while providing stable, repeatable protection for demanding electrical systems.

Why the JXD22B400 stands out

• 400A, 240V, 2-Pole design—handles heavy-duty circuits and can function as a main disconnect in larger panels, while protecting both legs of a 240-volt supply.
• Bolt-on mounting—a rugged, vibration-resistant bus connection that maintains a solid electrical tie-through even in installations subject to movement or vibration.
• Thermal-magnetic trip unit—delivers stable, repeatable protection by combining thermal overload sensing with instantaneous magnetic trip for fast fault interruption.
• OEM compatibility—designed to be fully compatible with matching Siemens panelboards and load centers, ensuring fit, performance, and reliable protection without guesswork.
• Versatile application—well suited for residential, commercial, and light industrial environments where robust protection and dependable operation are critical.

Ideal use cases

Use the JXD22B400 as a main breaker in mid-to-large panelboards, a primary feeder in commercial load centers, or as a rugged branch-circuit protector for demanding equipment rooms. Its bolt-on construction makes retrofit installations straightforward in existing Siemens panel systems, minimizing downtime and ensuring a secure, long-lasting connection.

Technical snapshot

• Manufacturer: Siemens
• Part number: JXD22B400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400A
• Voltage rating: 240V
• Poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation and long-term reliability

Choose the JXD22B400 when you need a dependable, high-current protection solution that stays secured under vibration and delivers predictable protection semantics over time. Pair it with compatible Siemens panelboards and load centers for a cohesive, engineer-approved protection strategy in both new builds and upgrades. Maintain proper torqueing and follow standard installation guidelines to preserve the integrity of the bus connection and trip performance.

With the Siemens JXD22B400, you’re selecting a purpose-built, high-capacity breaker designed to safeguard critical circuits in homes, businesses, and light-industrial settings—delivering confidence where power reliability matters most.