The 140G-J6F3-D12 molded case circuit breaker is a general-purpose circuit breaker from the Allen-Bradley 140G molded case circuit breaker family designed to provide short-circuit protection to most industrial control panel applications. The 140G-J6F3-D12 circuit breaker is a high-performance protection unit consisting of adjustable thermal and magnetic trip elements to accommodate a wider range of applications. The 140G-J6F3-D12 circuit breaker has a continuous current rating of 250 Amps, and a maximum operating voltage rating of 600 Volts AC according to the UL/CSA standards. It has a breaking capacity rating of 65 kA at 480 Volts AC and a rated impulse voltage of 1000 Volts. The 140G-J6F3-D12 circuit breaker has a thermal-magnetic trip unit with an adjustable thermal trip rating between 87.5 and 125 Amps and a magnetic trip range of 625 to 1250 Amps.

The 140G-J6F3-D12 circuit breaker has a bimetallic element that provides thermal trip action when the ambient temperature around the breaker exceeds the user's set values. It also has an electromagnet coil connected in series with a line current that provides instantaneous tripping when the current exceeds the recommended set value. The 140G-J6F3-D12 circuit breaker has a 3-pole design, with standard bolt-on load and line terminal type, and it also comes with the standard 39.2-inch pigtail wiring for the termination of the internal accessories. The tripping of the 140G-J6F3-D12 circuit breaker can be done remotely through an add-on shunt trip which is an optional accessory that can be connected to a PLC or an E-stop relay. The 140G-J6F3-D12 circuit breaker also supports various internal accessories options to further extend its application capabilities and performance. It has an ambient operating temperature limit of 40 degrees Celsius, and it is rated 80% efficient at this temperature value. The 140G-J6F3-D12 circuit breaker weighs approximately 5.51 pounds, and it has total mounting dimensions of 4.1 x 3.2 x 6.3 inches.