The Allen-Bradley 140U-Q6X3 circuit breaker is a circuit breaker from the Bulletin 140U series which has operational current rating of 600 Amps. There are three poles on the 140U-Q6X3 circuit breaker and this breaker is available in a Q-frame enclosure. The interrupting capacity rating for the circuit breaker is from 60 to 69 kiloamps. Q-frame breakers from the 140U family like this one support 300 to 600 Amps current ratings. Q-frame breakers support both electronic and thermal-magnetic trip units. The interrupting ratings at 380 to 415 Volts AC voltage for Q-frame breakers range from 45 to 70 kiloamps. At 480 Volts AC, the interrupting rating range is 35 to 65 kiloamps, at 600 Volts AC, the interrupting capacity range is 25 to 35 kiloamps, and at 690 Volts AC, the interrupting capacity range is 20 to 25 kiloamps.

The 140U-Q6X3 circuit breaker complies with the following standards: the UL 489, CE, KEMA – KEUR, CSA 22.2, and the IEC 60947-2 standards. The service breaking capacity specifications for the 140U-Q6X3 circuit breaker at 50 Hertz are as follows: 100 kiloamps at 220 to 240 Volts AC, 70 kiloamps at 380 to 415 Volts AC, 50 kiloamps at 500 Volts AC, and 25 kiloamps at 690 Volts AC. The interrupting capacity specifications for the 140U-Q6X3 circuit breaker at 60 Hertz are 100 kiloamps at 240 Volts AC, 65 kiloamps at 480 Volts AC, and 35 kiloamps at 600 Volts AC. The available field-installable accessories for the 140U-Q6X3 circuit breaker include flex-cable operating mechanisms, rotary variable-depth operating mechanisms, phase barriers, a padlock kit, an operating handle extension, and terminal lugs. The planning and implementation of electrical systems should only be performed by trained technicians. Failure to follow this precaution can lead to serious injury and even death.