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140U-K3D3-D30

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The Allen-Bradley/Rockwell Automation 140U-K3D3-D30 circuit breaker is a Bulletin 140U series molded case circuit breaker with a Size K frame. It can protect circuits in industrial systems with fixed thermal protection and with adjustable magnetic protection. The 140U-K3D3-D30 molded case circuit breaker’s interrupting ratings are 35 Amps at 480 Volts and 40 Amps at 400 Volts. Its continuous operating current rating is 300 Amps. The 140U-K3D3-D30 molded case circuit breaker is designed to be compact and to provide powerful interrupting ratings at the same time.

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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with DO Supply's 2-year warranty.

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Technical specifications for 140U-K3D3-D30

Brand	Allen-Bradley / Rockwell Automation
Series	140U MCB
Part Number	140U-K3D3-D30
Description	UL Molded Case Circuit Breaker
Frame	K
Current Rating	300 Amps
Interrupting Rating	35 Kilo-Amps
Protection Type	Fixed Thermal/AdjustableMagnetic Trip Unit
Number of Poles	3
Rated Operating Voltage	480 Volts AC
Type of Control	Toggle Lever
Terminals	End Cap Bolt-On
Operating Temperature	-8 to 60 Degrees Celsius

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.

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The Allen-Bradley 140U-K3D3-D30 Molded Case Circuit Breaker is a UL-489 listed circuit breaker that is designed to provide overcurrent protection to a wide range of industrial control panel applications. It belongs to the 400 Amos rated K-Frame circuit breaker family and it comes with a compact design that makes it suitable for applications that require minimal panel space. The 140U-K3D3-D30 Circuit Breaker is suitable for back-feeding (at around 240, 480, and 277 Volts AC, and it can be used in applications like the feeder circuits (brach circuit application), control circuits, heating, air conditioning and refrigeration (HACR), and the high-intensity-discharge circuit applications.

The 140U-K3D3-D30 Circuit Breaker has a 3-phase supply voltage rating of 480 Volts AC and a maximum trip current rating of 300 Amps. It has a breaking capacity of 35 Kilo-Amps (KA) at 480 Volts AC input voltage and a UL rated insulation voltage of 600 Volts. This device has a lifespan (mechanical) of about a hundred thousand operations and an electrical lifespan of around ten thousand operations. The 140U-K3D3-D30 Circuit Breaker has protection unit that consists of a fixed thermal and an adjustable magnetic strip. This trip unit provides fixed overload protection via a bimetal element that actuates the trip with a delay based on the set trip value, and it offers instantaneous trip action via an electromagnetic device with adjustable trip ratings. The 140U-K3D3-D30 Circuit Breaker has a fixed thermal rating of 300 Amps and an adjustable magnetic trip rating between 1500 Amps and 3000 Amps. It has an open style design, and it comes with an end cap bolt-on connector.