JXD63H400 SIEMENS

JXD63H400 Siemens Basis unit

Brand：SIEMENS Model number：JXD63H400

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The JXD63H400 is a 400-Ampere frame circuit breaker designed for high-demand low-voltage power distribution. It utilizes an interchangeable thermal-magnetic trip unit, which combines time-delay thermal protection for overload conditions with instantaneous magnetic tripping for high-fault short circuits. The "H" in the part number designates its high-interrupting rating, making it suitable for service entrance equipment and locations with elevated available fault currents.

Product Parameters

Frame Type: Sentron JXD Frame
Number of Poles: 3-Pole
Ampere Rating: 400 Amperes continuous rating
Maximum Voltage Rating: 600 VAC / 250 VDC
Trip Unit Type: Thermal-Magnetic (Fixed thermal, adjustable magnetic trip settings)
Interrupting Rating at 240 VAC: 100 kA
Interrupting Rating at 480 VAC: 65 kA
Interrupting Rating at 600 VAC: 25 kA
Connection Type: Bolt-on lug terminals (accepts copper or aluminum conductors)
Standards Compliance: UL 489 listed, CSA certified

Product Advantages

A primary advantage of the JXD63H400 is its High Interrupting Capacity, which allows it to safely clear severe short-circuit faults without damaging surrounding switchgear or power infrastructure. The Adjustable Magnetic Trip feature provides flexibility, allowing engineers to fine-tune the instantaneous tripping threshold to accommodate high inrush currents from motor starting or transformer primary energization.

The Proven Sentron Construction offers exceptionally durable mechanical contacts and effective arc-chutes, resulting in a long operational lifespan and high electrical endurance. Additionally, its Standardized Frame Size ensures easy integration and replacement within existing Siemens panelboards, switchboards, and individual enclosures.

Important Considerations and Precautions

When installing and maintaining the JXD63H400, strictly adhere to proper Terminal Torque Values specified by Siemens to ensure a low-resistance electrical connection and prevent thermal overheating at the lugs. Always perform a complete system De-energization before mounting, wiring, or adjusting the breaker settings to prevent severe electric shock or arc flash hazards.

Because this breaker features adjustable magnetic trip settings, ensure the dial is calibrated according to a proper Power System Coordination Study so that downstream breakers clear localized faults before this main feeder trips. Finally, install the breaker inside an enclosure with an appropriate NEMA rating to protect the internal operating mechanism from dust, corrosive vapors, and moisture.

Product Applications

The Siemens JXD63H400 is deployed across a broad array of demanding industrial and commercial power distribution applications.

Industrial Manufacturing Plants: Used as a main or branch circuit breaker protecting heavy motor control centers (MCCs) and large machinery.
Commercial Buildings: Serves as a main distribution breaker in switchboards and panelboards for high-rise offices, hospitals, and educational facilities.
Service Entrance Equipment: Installed at the main utility point of entry where high fault current interrupting capability is required.
Data Centers and Facilities: Protects uninterruptible power supply (UPS) distribution networks and large HVAC chiller systems.
Infrastructure Projects: Employed in water treatment plants, transportation hubs, and pumping stations for dependable load protection.

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