Siemens FXD63B125 Molded Case Circuit Breaker – 125A – 3-Pole / 3-Phase – 600V – 35kA @ 480V – Bolt-On – Sentron FXD Series

The Siemens FXD63B125 is a 125A, 3-pole, 3-phase molded case circuit breaker from the Siemens Sentron Series, Type FXD. It features thermal-magnetic protection with Long-Time and Instantaneous (LI) trip functions and a non-interchangeable trip.

The FXD63B125 is rated for 600V and provides a 35kA interrupting rating at 480V, with standard interrupting capacity. It uses a bolt-on connection and is UL Listed for reverse-fed applications. The breaker is supplied without lugs installed.

Specifications:

• Manufacturer: Siemens
• Product Type: Molded Case Circuit Breaker
• Product Family: Sentron
• Series: Sentron
• Type: FXD
• Catalog No.: FXD63B125
• Current Rating: 125A
• Number of Poles: 3-Pole
• Phase: 3-Phase
• Voltage Rating: 600V
• Interrupting Rating: 35kA @ 480V
• Interrupting Capacity: Standard
• Protection Type: Thermal-Magnetic
• Trip Functions: Long-Time and Instantaneous (LI)
• Trip Type: Non-Interchangeable
• Connection / Mounting: Bolt-On
• Lugs: No Lugs Installed
• Temperature Rating: 40°C
• Reverse Feed: UL Listed for Reverse-Fed Applications
• Application: Electrical Distribution and Overcurrent Protection

Part Numbers & Identification:

• Manufacturer Part Number (MPN): FXD63B125
• Catalog Number: FXD63B125
• Model: FXD63B125
• Product Family: Siemens Sentron Molded Case Circuit Breakers
• Series: Sentron
• Type: FXD
• Brand: Siemens
• Manufacturer: Siemens
• Product Type: Molded Case Circuit Breaker
• Breaker Configuration: 3-Pole, 125A
• UPC:783643211247

Compatibility:

Designed for use with compatible Siemens Sentron FXD Series electrical distribution equipment that accepts bolt-on molded case circuit breakers. The FXD63B125 provides 125A, 3-pole thermal-magnetic protection for compatible 600V applications and has a 35kA interrupting rating at 480V.

The breaker features a non-interchangeable LI trip and is suitable for reverse-fed applications as specified. No lugs are installed, so compatible terminal requirements should be verified separately.

Always verify the specific panelboard or electrical equipment model, approved breaker type, system voltage, available fault current, pole configuration, reverse-feed requirements, terminal arrangement, and installation requirements before installation.

Certifications:

• UL Listed for Reverse-Fed Applications
• 125A Rated
• 3-Pole / 3-Phase
• 600V Rated
• 35kA @ 480V Interrupting Rating
• Genuine Siemens Product

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