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Allen Bradley 140U MCB 140U-J3X3

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140U-J3X3

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The 140U-J3X3 model from Allen Bradley serves as a molded case circuit breaker. This unit is configured for 3-phase applications with a continuous current rating of 250 A, operating at a voltage of 480 VAC.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 140U-J3X3

ManufacturerAllen Bradley
Product TypeMolded Case Circuit Breaker
Product Line140U MCB
Part Number140U-J3X3
Weight5.56 lbs (2.52 kg)
Frame SizeJ Frame
Continuous Current Rating250 A
Number of Poles3 poles
Phase Type3 Phase
Rated Operating Voltage480 VAC
Minimum Frequency50 Hz
Maximum Frequency60 Hz
Interrupting Rating (at 480V AC)35 kA
Interrupting Rating (at 240V AC)65 kA
Trip Unit TypeThermal-Magnetic
Cooling MethodNatural Convection
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The 140U-J3X3 is classified as a molded case circuit breaker within the Allen Bradley 140U MCB series, specifically designed for rigorous industrial environments. This device is built on a J frame size and supports a continuous current rating of 250 A, ensuring reliable protection against overloads and short circuits. Configured for three-phase systems, it operates effectively at a rated voltage of 480 VAC.

The device can accommodate input frequencies ranging from a minimum of 50 Hz to a maximum of 60 Hz, making it versatile for various applications. In terms of performance, the interrupting ratings are robust; the breaker can handle up to 35 kA at 480V AC and an impressive 65 kA at 240V AC, which highlights its ability to disconnect during fault conditions.

For operational safety, the trip unit utilizes a thermal-magnetic design, providing dual protection against overcurrents. The 140U-J3X3 employs natural convection as its cooling method, which efficiently dissipates heat generated during operation. This characteristic ensures optimal performance in a variety of installation environments.