The 140U-Q3D3-D60 circuit breaker is a three-pole molded case circuit breaker with a built-in fixed thermal–adjustable magnetic trip unit. The rated continuous current and thermal trip ratings for the 140U-Q3D3-D60 circuit breaker are both 600 Amps. Buttons are provided on each of the 3-poles on the breaker for changing the magnetic trip settings. A suitably sized screwdriver can be used for adjusting the magnetic trip threshold. The interrupting capacity ratings at 400 Volts AC and 480 Volts AC voltage are 45 kiloamps and 35 kiloamps, respectively. The 140U-Q3D3-D60 circuit breaker comes in a Q-frame enclosure and it belongs to Bulletin 140U product series from Allen-Bradley. The maximum current rating for the Q-fame circuit breakers is 600 Amps. The dimensions of the 140U-Q3D3-D60 circuit breaker are 12.5 x 8.25 x 4.375 inches.

Agency approvals for the 140U-Q3D3-D60 circuit breaker include the UL 489, KEMA – KEUR, CE CSA 22.2, and IEC 60947-2 standards. The terminal box lugs for the circuit breaker need to be ordered separately from Allen-Bradley. Performance specifications for the 140U-Q3D3-D60 circuit breaker include the following interrupting ratings at 60 Hertz: 65 kiloamps at 240 Volts AC, 35 kiloamps at 480 Volts AC, and 25 kiloamps at 600 Volts AC. The ultimate breaking capacity specifications at 50 Hertz are 85 kiloamps at 220 Volts AC, 45 kiloamps at 415 Volts AC, 30 kiloamps at 500 Volts AC, and 20 kiloamps at 690 Volts AC. Applications for the 140U-Q3D3-D60 circuit breaker include branch circuit and main circuit protection applications. The breaker can provide protection against short circuits and overloads. To minimize the risk of injury and equipment damage, only experienced and trained professionals should install, service, and repair the 140U-Q3D3-D60 circuit breaker.