The 140U-JD3D3-D25 circuit breaker from Allen-Bradley is a JD-frame circuit breaker with a 250 Amps continuous current rating. The thermal trip setting on the 140U-JD3D3-D25 circuit breaker is fixed. However, magnetic trip settings can be set to different values according to application requirements. The configurable magnetic trip settings are 1250 Amps, 1405 Amps, 1565 Amps, 1720 Amps, 1875 Amps, 2030 Amps, 2185 Amps, 2340 Amps, and 2500 Amps. The NEMA starter size for the breaker is Size 5 and the Horsepower ratings are as follows: 150 to 200 Horsepower at 575 Volts AC, 125 to 150 Horsepower at 460 Volts AC, 100 to 125 Horsepower at 380 to 415 Volts AC, 60 to 75 Horsepower at 230 Volts AC, and 50 to 60 Horsepower at 200 Volts AC.

The 140U-JD3D3-D25 circuit breaker is part of the Bulletin 140U series which supports both electronic and thermal-magnetic trip modules, which means that 70 to 200 Amps is the available range of ratings for breakers with electronic trip modules and 15 to 800 Amps is the available range of ratings for breakers with thermal-magnetic trip modules. One of the key features of the 140U series breakers is the support for accessories which can be ordered and installed in the field or that can be ordered as preinstalled modules from the factory. The breaking capacity/interrupting rating range for the 140U-JD3D3-D25 circuit breaker is 30 to 39 kiloamps. The 140U-JD3D3-D25 circuit breaker has three poles. The 140U-JD3D3-D25 circuit breaker is suited for use in applications that require main circuit or branch circuit protection against short circuits, ground faults, or current overloads. The compact 140U-JD3D3-D25 circuit breaker can be installed inside industrial panelboards or enclosures.