Siemens JXD63B350 Circuit Breaker 3-pole 600V 350A

Product Description

The SIEMENS JXD63B350 is a molded case circuit breaker in the JD6 frame class, rated for 3-pole operation at 600 volts and 350 amps. It provides overcurrent and short-circuit protection in commercial and industrial power distribution systems. The JD6 frame is a well-established platform used in panelboards, switchboards, and motor control applications where high-ampacity branch and feeder circuit protection is required. Licensed electricians and electrical contractors are the primary installers of this device. Its 3-pole configuration makes it suited for three-phase distribution systems operating at up to 600 volts AC.

This breaker is used in commercial and industrial electrical distribution applications requiring 350-amp feeder or branch circuit protection. Typical installations include main distribution panels, sub-panels, motor control centers, and industrial switchboards operating on three-phase 600-volt systems. It is appropriate for new construction wiring as well as retrofit or replacement applications where an existing JD6-frame breaker requires substitution.

Key Features

• 3-pole configuration for three-phase circuit protection up to 600 volts
• 350-amp continuous current rating for high-ampacity feeder and branch circuits
• JD6 frame class for compatibility with JD6-rated panelboards and switchboards
• Molded case construction provides thermal-magnetic overcurrent and short-circuit protection
• Designed for commercial and industrial power distribution environments

Compatibility

Designed as an OEM-style replacement or new-installation circuit breaker for JD6-frame commercial and industrial panelboards and switchboards rated for 3-pole 600-volt applications. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the panel or switchboard before installing or replacing this breaker, following proper lockout/tagout (LOTO) procedures. Verify that the bus rating, frame size, and interrupt capacity of the enclosure are compatible with this breaker before installation. Do not install this breaker in enclosures rated below the breaker voltage or amperage specifications.

Technical Specifications

• Poles: 3
• Voltage Rating: 600 volts
• Ampere Rating: 350 amps
• Frame Class: JD6
• Weight: 18.301 pounds
• UPC: 78364321308

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: JXD63B350