The Allen-Bradley 140U-J3D3-D17 Molded Case Circuit Breaker (MCCB) comes with a size J frame, 3 poles, and 250 Amps of frame current rating. It has 400 to 480 Volts AC of rated operational voltage, 175 Amps of current rating, 50/60 Hertz of frequency rating, and 35 Kiloamps of interrupting rating. The protection type of this circuit breaker is the adjustable magnetic and fixed thermal protection type. Its approximate shipping weight is 11.4 pounds. This is a device that is designed to open and close a control circuit. The Allen-Bradley 140U-J3D3-D17 Molded Case Circuit Breaker can automatically open the circuit under specified abnormal conditions. There is an arc chamber within the breaker to provide short circuit protection while stopping the current flow.

 

The 140U-J3D3-D17 Molded Case Circuit Breaker is CSA listed, UL listed, and KEMA certified in order to compile with various industrial standards. Its compact size and design save considerable space in a panel design. It has minimized downtime compared to a fuse based system because it can be reset and switched on soon after a faulty situation. The 140U-J3D3-D17 MCCB is commonly used as a feeder breaker or a single circuit breaker. It may be used for motor circuits and motor control circuit transformers, but the best options for these applications are the MCP or bulletin 1492 supplementary protectors. This MCCB and its accessories are designed to be field installed. Its compact design ensures reduced space requirements and easy installation. The maintenance mode of the circuit breaker allows for system testing when the MCCB is energized. The Allen-Bradley 140U-J3D3-D17 Molded Case Circuit Breaker can be used in capacitor banks which draw high current in commercial and industrial electrical systems. Its adjustable trip unit ensures a precise response in high current industrial applications while providing maximum flexibility.

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