The 140UE-N7H3-E12 circuit breaker is an N-frame IEC molded case circuit breaker. It is part of the 140UE product line which offers 70 to 1250 Amps current ratings for circuit breakers with electronic trip units and 15 to 800 Amps current ratings for circuit breakers with thermal-magnetic trip units. Features of the Bulletin 140UE circuit breakers includes factory or field-installable accessories, flexible cable operating mechanisms, and rotary variable-depth operating mechanisms. The 140UE-N7H3-E12 circuit breaker is a 3-pole circuit breaker rated for 1250 Amps of current and it comes with an electronic LSI (long, short, high instant) trip unit. The interrupting rating or breaking capacity for the 140UE-N7H3-E12 circuit breaker is from 70 to 79 kiloamps at 400 Volts AC voltage. The current rating for the breaker is 1200 Amps.

The dimensions of the N-frame 140UE-N7H3-E12 circuit breaker are 406 x 210 x 140 millimeters and it weighs 21.3 kilograms. The breaker complies with multiple standards including the KEMA-KEUR, CE, and IEC 60947-2 standards. The power dissipation of the 140UE-N7H3-E12 circuit breaker during operation under a load is 210 Watts. The breaking capacity at 50 Hertz and 240 Volts AC is 100 kiloamps, and it is 70 kiloamps at 380 to 415 Volts AC, 50 kiloamps at 500 Volts AC, and 25 kiloamps at 590 Volts AC. The interrupting rating at 60 Hertz is 100 kiloamps at 240 Volts AC and 65 kiloamps at 480 Volts AC. The ambient temperature for optimal operation ranges from -8.9 to 60 degrees Celsius. The insulation voltage rating is 690 Volts for the auxiliary contacts and 750 Volts for the main poles. The ratings for impulse voltage for the auxiliary contacts and main conductors are 4 kilovolts and 8 kilovolts, respectively.