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Allen Bradley 140U MCB 140UE-J4X3

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140UE-J4X3

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The 140UE-J4X3 from Allen Bradley is a molded case circuit breaker featuring versatile operational capabilities. It operates effectively at a rated current of 250 A and is compatible with frequencies up to 50/60 Hz.

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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 140UE-J4X3

ManufacturerAllen Bradley
Product TypeMolded case circuit breaker
Product Line140U MCB
Part Number140UE-J4X3
Weight4.44 lbs (2.01 kg)
Frequency Compatibility50/60 Hz
Rated Current250 A
Number of Poles3 Poles
Breaking Capacity40–49 kA @ 400 V
Trip CompatibilityThermal-magnetic or electronic
Rated Insulation VoltageUp to 690 V AC
Rated Operational VoltageUp to 600–690 V AC
Mounting TypePanel mount
Terminal TypeLug terminals
Operating MechanismRotary or direct handle
Accessory SupportShunt, UVR, aux contacts
Derating at 60 °C (Max Setting)90% of Rated Current
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The Allen Bradley 140UE-J4X3 circuit breaker is a molded case type device that provides crucial protection for electrical circuits. Capable of functioning at frequencies of 50 Hz and 60 Hz, it is designed for complex industrial environments. The rated current for this model is set at 250 A, making it suitable for various applications.

This circuit breaker offers an impressive breaking capacity between 40 kA and 49 kA at a voltage of 400 V, ensuring effective interruption of fault currents. Users have the option of selecting a thermal-magnetic or electronic trip mechanism for customized protection in different operational scenarios. This flexibility aids in ensuring system reliability.

The 140UE-J4X3 supports rated insulation voltage levels of up to 690 V AC and can manage operational voltages ranging from 600 V to 690 V AC, making it well-equipped for high-voltage applications. Also, the panel mount design of this circuit breaker makes installation straightforward, while the lug terminals facilitate secure electrical connections.

This device operates using either a rotary mechanism or a direct handle, allowing for ergonomic control based on user preference. Furthermore, it includes support for various accessories like shunt trip devices, undervoltage releases (UVR), and auxiliary contacts, enhancing its versatility. It is worth noting that when operating at a maximum temperature of 60 °C, the circuit breaker is subject to a derating of up to 90% of its rated current, ensuring it stays within safe operational parameters.