The 140G-H3C3-C40 circuit breaker is a 40 Amps rated circuit breaker from the Allen-Bradley 140G series. The breaker has a 25,000-hour mechanical life and an 8000-hour electrical life. The 140G-H3C3-C40 circuit breaker is a molded case circuit breaker. The number of poles on the breaker is 3. It has a 35 kiloamps interrupting rating at 480 Volts AC, a 100 kiloamps interrupting rating at 240 Volts AC, and an 18 kiloamps interrupting rating at 600 Volts AC. The breaking capacity for the 140G-H3C3-C40 circuit breaker at 50 to 60 Hertz according to the IEC 60947-2 standards is 85 kiloamps at 220 Volts AC, 50 kiloamps at 415 Volts AC, 50 kiloamps at 440 Volts AC, and 12 kiloamps at 690 Volts AC. For DC voltages, the breaking capacity for the 140G-H3C3-C40 circuit breaker according to the IEC 60947-2 standards is 50 kiloamps at 250 to 500 Volts DC.

The trip unit on the 140G-H3C3-C40 circuit breaker is a thermal/magnetic unit which is non-adjustable. The breaker rating for the thermal trip is 50 Amps, and for the magnetic trip, it is 400 Amps. The dimensions of the H Frame 140G-H3C3-C40 circuit breaker are 130 x 90 x 82 millimeters. The weight of the breaker is approximately 2.65 pounds. The copper wire used with the breaker should have a temperature rating of at least 167 degrees Fahrenheit. When not in use, the 140G-H3C3-C40 circuit breaker should be kept in storage where the ambient temperature is between -40 and 176 degrees Fahrenheit. The maximum ambient operating temperature for the 140G-H3C3-C40 circuit breaker which does not lead to derating is 104 degrees Fahrenheit. The 140G-H3C3-C40 circuit breaker should only be installed when the system electrical power is disconnected.