The 140G-JTF3-D17 circuit breaker is an Allen-Bradley trip unit circuit breaker or programmer in the 140G series. This circuit breaker has 3 poles and it runs on 170 Amps of current and 600 Volts AC operating voltage. It also comes with li–long-time and real-time trip features that are uniquely designed to be utilized with the molded case circuit breakers such as the 140G-J circuit breakers, with the thermal-magnetic current of 250 Amps. Generally, the 140G circuit breakers like the 140G-JTF3-D17 molded case circuit breaker come in 9 distinct frame sizes ranging from 10 to 3000 Amps to fit the requirements of all the breaking capacities as well as all the current ratings. This module is available with a variety of accessories, with circuit protection against any likely short circuit, overload protection, and ground fault protection.

The 140G-JTF3-D17 circuit breaker and molded case circuit breakers, in general, provide thermal protection for both overcurrent and short circuits. Also, the 140G-JTF3-D17 circuit breaker is specially designed with protection features that work through mechanical means by using the heater elements or electronics to identify the flow of current and also to model the accompanying heat that the current generates. When the electronic 140G-JTF3-D17 circuit breaker is applied, the ability for a machine to regulate the rating of a thermal trip to help in shaping the trip curve becomes available. As a result, fewer trip units will be needed to help cover a wide range of current values. Even though the trip unit may be used to offer protection within the current range, the rating plug can also be used in limiting the adjustability range.