The 140U-I0C3-C20 circuit breaker is designed and manufactured by Allen-Bradley/Rockwell Automation and it is available through the 140U product series. The circuit breakers with the 140U product code are built for motor protection and they are available in several different frames. Every frame has its own current rating, thus providing the versatility that allows the users to choose the device which fits their system the best. The 140U offers optional internal control modules and control module combinations with accessories that can further expand the capabilities of these devices. Also, the molded case circuit breakers from the 140U series offer different protection types to meet different application requirements. Allen-Bradley offers different combinations of fixed and adjustable thermal/magnetic protection types, along with special electronic protection types.

The 140U-I0C3-C20 circuit breaker features a NEMA starter size of 1 and three poles. The unit has an interrupting rating or breaking capacity of less than or equal to 100 kiloAmps and a continuous current rating of 20 Amps. The 140U-I0C3-C20 circuit breaker has an I Frame and it features THE thermal-magnetic/non-adjustable magnetic trip protection type. The operating magnetic trip range of device is 500 to 1000 Amps. The 140U-I0C3-C20 circuit breaker does not include an internal control module, but it includes many features that are sufficient for a variety of systems. The unit is made in accordance with standards such as the UL 489, CSA C22.2 (No. 5), and the IEC 60947-2 standards. So, the device is CE marked, CSA certified, and UL listed. The protection class of the 140U circuit breakers when it is wired is the IP2X class. Some of the featured functions of the 140U-I0C3-C20 circuit breaker are as rotary operators, flex cable operators, and molded case switches.