The 140U-H3C3-D10 circuit breaker is an H-Frame molded case circuit breaker with a 100 Amps operating current rating. It belongs to the Bulletin 140U product line from Allen-Bradley which includes circuit breakers that are rated from a minimum of 15 Amps to a maximum of 1200 Amps. This series of circuit breakers includes breakers with electronic trip modules, including the LS, LSI, LSG, and the LSIG circuit breaker variants, and it also includes breakers with thermal-magnetic trip modules. The 140U-H3C3-D10 circuit breaker comes with a thermal-magnetic trip module and it is rated for interrupting ratings between 30 and 39 kiloamps. The number of poles provided on the breaker is three. The maximum current ratings of the H-Frame breakers is 125 Amps and this line of circuit breakers complies with various standards, including the KEME, CE, CSA, UL 489, and IEC standards.

The total power dissipated as heat during operation by the 140U-H3C3-D10 circuit breaker is 20 Watts. For optimal operation, Allen-Bradley recommends that the ambient temperature of the area where the 140U-H3C3-D10 circuit breaker is installed be kept between 16 and 140 degrees Fahrenheit. The mechanical specifications for the 140U-H3C3-D10 circuit breaker include a weight of 3 pounds and circuit breaker dimensions of 5.5 x 3 x 3 inches (139.7 x 76.2 x 76.2 millimeters). For the main poles on the 140U-H3C3-D10 circuit breaker, the rated insulation voltage according to the IEC 60947-2 standards is 750 Volts AC. The rated impulse withstand voltage for the main conductors on the breaker is 6 kilovolts. At 50 Hertz line voltage, the service breaking capacity ratings are as follows: 43 kiloamps at 220 to 240 Volts AC and 30 kiloamps at 380 to 415 Volts AC.