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Allen Bradley 140U MCB 140U-LTD3-D30
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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140U-LTD3-D30

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The 140U-LTD3-D30 module is a trip unit that has been designed and manufactured by Allen-Bradley/Rockwell Automation as part of the Bulletin 140U series. It is meant to function as part of an Allen-Bradley Bulletin 140U series circuit breaker. The 140U-LTD3-D30 trip unit must be connected to a compatible Allen-Bradley Bulletin 140U series circuit breaker frame in order to create a fully functional circuit breaker. This trip unit fits circuit breaker frames that are Size L frames. The 140U-LTD3-D30 trip unit is a thermal/magnetic trip unit.

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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-LTD3-D30

BrandAllen-Bradley / Rockwell Automation
Series140U MCB
Part Number140U-LTD3-D30
Product Description Trip Unit
FrameL
No. of Poles 3
Protection Type Thermal/Magnetic
Rated Current 300 Amps
Adjustment Range (Thermal Trip) 300 Amps
Adjustment Range (Magnetic Trip) 1500-3000 Amps
Compatibility 600 Amps, L Frame, MCCB
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.

The Allen-Bradley 140U-LTD3-D30 Trip Unit comes with the thermal/magnetic protection type and with 300 Amps of rated current. It is compatible with the 600 Amps, Frame L MCCBs. The adjustable current range of the magnetic trip is 1500 to 3000 Amps. This trip unit provides thermal overload, short circuit, and ground fault protection. It is an electromechanical trip unit that has moving parts inside it. The trip unit ensures machine protection by opening the contacts automatically. It can be manually tripped by pressing a button. The 140U-LTD3-D30 Trip Unit is designed to sense the heat caused by an overload condition to provide protection for industrial power distribution circuits. It employs a bimetallic strip to sense overload conditions. When a short current occurs, it will create a magnetic force that will unlatch the trip unit. This trip unit is an interchangeable trip unit which is called a rating plug. Its instantaneous magnetic tripping characteristics cause instantaneous trips when the current reaches a set point.

The Allen-Bradley 140U-LTD3-D30 Trip Unit is suitable to provide protection for DC networks and electrical distribution systems. The 140U-LTD3-D30 Trip Unit opens a circuit automatically in a pre-defined overcurrent situation that can cause damages to the breaker. The breakers with this trip unit can be used in large electrical circuits with generators, motor control circuits, commercial electrical systems, and heavy-duty applications. If the ambient temperature is above 40 degrees Celsius, the unit will carry less current compared to its continuous current rating while making nuisance tripping. During installation, the circuit breaker handle must be in the "tripped" position or "off" position so that the technicians can remove the cover.

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