The 140G-J2F3-D17 circuit breaker is an advanced 140G circuit breaker manufactured by Allen-Bradley. It is designed to provide thermal overcurrent protection and short-circuit protection. The 140G-J2F3-D17 circuit breaker comes with 175 Amps of current rating and a J Frame enclosure. The maximum current specification for J Frame breakers is 250 Amps. A variable thermal/magnetic trip unit is available on the 140G-J2F3-D17 circuit breaker which can be set between 122.5 and 175 Amps for the thermal trip and between 875 and 1750 Amps for the magnetic trip. The 140G-J2F3-D17 circuit breaker is a 3-pole circuit breaker with 25 kiloamps interrupting/breaking capacity at 480 Volts AC. The breaker’s interrupting capacity ratings at 240 Volts AC and 600 Volts AC is 65 kiloamps and 14 kiloamps. Respectively.

The ultimate short-circuit breaking capacity ratings for the 140G-J2F3-D17 circuit breaker are 36 kiloamps at 500 Volts DC (with 3 poles in series), 36 kiloamps at 250 Volts DC (with 2 poles in series), 10 kiloamps at 690 Volts AC, 30 kiloamps at 500 Volts AC, 36 kiloamps at 440 Volts AC, and 65 kiloamps at 220 to 230 Volts AC. The 140G-J2F3-D17 circuit breaker weighs approximately 5.51 pounds. The measurements of the J Frame breaker are 105 x 82.5 x 160 millimeters (width x depth x height). Either copper or aluminum wire with a minimum temperature rating of 167 degrees Fahrenheit is recommended for circuit breaker termination. To prevent output derating, the temperature of the air which surrounds an operating 140G-J2F3-D17 circuit breaker should not be allowed to exceed 104 degrees Fahrenheit. At 240 operations per hour, the rated mechanical life of the 140G-J2F3-D17 circuit breaker is 25,000 operations. At 120 operations per hour and 415 Volts AC, the rated electrical life of the 140G-J2F3-D17 circuit breaker is 8000 operations.