The 140U-Q6D3-D60 circuit breaker is an Allen-Bradley circuit breaker with a Q-frame enclosure. The maximum current rating for the Q-frame breakers is 600 Amps. The continuous current rating for the 140U-Q6D3-D60 circuit breaker is 600 Amps. The number of poles provided on the 140U-Q6D3-D60 circuit breaker are three. The trip unit on the 140U-Q6D3-D60 circuit breaker is fixed thermal–adjustable magnetic. At 480 Volts AC, the interrupting rating/breaking capacity range for the 140U-Q6D3-D60 circuit breaker runs from a minimum of 60 kiloamps to a maximum of 69 kiloamps. The in-service current breaking capacity specifications for the breaker at 50 Hertz line frequency are as follows: 100 kiloamps at 220 or 240 Volts AC, 70 kiloamps at 380 to 415 Volts AC, 38 kiloamps at 500 Volts AC, and 13 kiloamps at 690 Volts AC.

Several internal accessories are available for the 140U-Q6D3-D60 circuit breaker with a Q-frame enclosure. These include an auxiliary contact which indicates the on/off breaker status, an alarm contact which gives an indication when the breaker is tripped, an auxiliary/alarm contact which is a combination of an alarm contact and auxiliary contact, a shunt trip which is used for remote breaker tripping, and an undervoltage release which automatically trips the circuit breaker when it falls to a present voltage level. External accessories are also available and these include a flex-cable operating mechanism, phase barriers, terminal lugs, operating handle extensions, a padlock kit, and a variable-depth operating mechanism. Technical staff tasked with servicing or installing the 140U-Q6D3-D60 circuit breaker should possess the relevant training and experience. All the necessary tools which are recommended for ensuring the safety of the users and equipment should be made available to the working teams.