The Allen-Bradley 140G-J0F3-D12 molded case circuit breaker is a J Frame circuit breaker from the 140G circuit breaker series that is built for thermal overcurrent and short-circuit protection to main, branch, and feeder circuits in industrial control applications. The 140G-J0F3-D12 circuit breaker offers a very compact breaker design that makes it ideal for applications with limited mounting space, and it supports a wide variety of customer-fit accessories that help to simplify the configuration and installation processes. The 140G-J0F3-D12 circuit breaker has a 125 Amps breaker rating at 480 Volts AC and it is suitable for applications rated at up to 600 Volts AC. It has a breaking capacity rating of 100 kiloamps at 480 Volts AC and a rated insulation voltage of 1000 Volts.

The 140G-J0F3-D12 circuit breaker has a rated impulse withstand voltage of 8 kilovolts and a designated 120 operations per hour electrical lifespan. It has a trip unit with trip ratings that can be adjusted to meet a wide variety of application currents. This trip unit comprises a thermal heater element with adjustable trip values from 87.5 Amps to 125 Amps, and an electromagnet with an adjustable magnetic trip rating from 625 to 1250 Amps. The 140G-J0F3-D12 circuit breaker has 3-pole wiring with end cap type terminals, and it can be mounted or installed in any configuration without de-rating. Available options like the auxiliary contact, alarm contact, under-voltage release (UVR), residual current release, and shunt trip options can be attached to enhance the breaker performance and PLC connectivity. The 140G-J0F3-D12 circuit breaker has an 80% efficiency rating at 40 degrees Celsius ambient temperature and it is sensitive to temperature changes above this value. The 140G-J0F3-D12 circuit breaker is UL listed, CE marked, and CSA certified, and it has approximate mounting dimensions of 105 x 82.5 x 160 meters.