The 125 Amps rated 140U-H6C2-D12 circuit breaker is a molded-case circuit breaker in an H-Frame enclosure. It is part of the Allen-Bradley Bulletin 140U product range and it offers 60 to 69 kiloamps interrupting ratings or breaking capacities at 480 Volts. The 140U-H6C2-D12 circuit breaker is a two-pole device and it comes with an integrated fixed thermal-magnetic trip unit. The rated power dissipation level is 16 Watts. The dimensions of this H-Frame device are 5.5 x 2 x 3 inches (H x W x D) and it has an approximate weight of 2 pounds. The Bulletin 140U circuit breakers offer 15 to 800 Amps current ratings with thermal-magnetic trip units and 70 to 200 Amps ratings with electronic trip units. Accessories for the breaker can be installed at the factory or in the field.

At 60 Hertz frequency, the interrupting rating for the 140U-H6C2-D12 circuit breaker is 25 kiloamps at 600 or 347 Volts AC. At 50 Hertz frequency, the breaking capacity ratings are 100 kiloamps of ultimate breaking capacity and 50 Amps of service breaking capacity at 220 or 240 Volts AC and 70 kiloamps of ultimate breaking capacity and 35 kiloamps of service breaking capacity at 380 or 415 Volts AC. The interrupt rating at 480 Volts AC is 65 kiloamps. The low setting and high setting derating factor specifications are 73% at 73 degrees Celsius, 83% at 60 degrees Celsius, 87% at 55 degrees Celsius, 92% at 50 degrees Celsius, and 100% at 40 degrees Celsius. The working ambient temperature range for the 140U-H6C2-D12 circuit breaker is from -8.9 to 60 degrees Celsius. The standards with which the 140U-H6C2-D12 circuit breaker complies include the UL 489, KEMA, CCC, and the CSA 22.2 standards.