The 140G-H3X3 circuit breaker is a 140G molded case circuit breaker manufactured by the Eaton Corporation. The 140G-H3X3 circuit breaker is classified under the Eaton 140G series of circuit breakers and it features a rated insulation voltage of 1000 Volts. The unit features the current range frame while the protection feature is a breaker frame. The molded case circuit breaker is operated by using electronics to detect the current flow and by modeling the associated heat generated by the current. The 140G-H3X3 circuit breaker comes with an interrupting rating of 35 kA at 480 Volts while the unit’s current rating is 125 Amps. The frame type or frame rating is “H,” and the current range is classified as “frame only.”

The 140G-H3X3 circuit breaker features a rated impulse withstand voltage of 8 kV while the unit features a mechanical lifespan of 240 operations per hour. The electrical life is 120 operations per hour. The 140G-H3X3 circuit breaker is designed to provide applications with overcurrent protection for the conductors and the equipment. Whenever the current passes the value and the duration that can cause dangerous temperatures in the conductor or its insulation, the circuit breaker opens or closes to protect the equipment. The molded case circuit breaker is used as the main power disconnecting means on the control panel. It provides protection from overcurrent as well as short currents. Electronic circuit breakers can adjust thermal trip ratings and shape the trip that is available and this leads to a few trip units that have the ability to protect the current range. In some instances, the rating plug can be used for limiting the adjustability range.