The Allen-Bradley 140U-I6C3-C70 UL listed circuit breaker is a discontinued I-Frame UL listed circuit breaker that is designed to provide overcurrent protection (both thermal over current protection and short-circuit protection) in an industrial control application. This circuit breaker is designed to be small, and its compact design makes it ideal for tight panel spaces. The 140U-I6C3-C70 Circuit Breaker has a higher interrupting rating, and it comes with a fixed thermal and fized magnetic trip unit. It is suitable for control circuit applications, feeder circuit applications, high-intensity discharge applications, HACR applications, and for reverse feed use. The 140U-I6C3-C70 Circuit Breaker has a three-phase voltage rating of 480 Volts AC (in a 230 to 690 Volts AC operating range) and a trip current rating of 70 Amps. It has a maximum breaking capacity rating of 64 kA and a rated insulation voltage of 750 Volts. It also has an impulse withstand rating of 6000 Volts AC (UL) and a mechanical lifespan of up to 100,000 operations.

The Allen-Bradley 140U-I6C3-C70 Circuit Breaker has a fixed and non-interchangeable magnetic and thermal trip unit that offers both thermal and magnetic trip actions. The magnetic trip unit utilizes the magnetic force that is created by a current flowing in the opposite direction for an instantaneous trip action, while the thermal trip unit uses a bimetal heat element that is deflected as it is heated by the incoming current, causing the circuit breaker to trip. The 140U-I6C3-C70 Circuit Breaker, like all circuit breakers with mechanical trip units, is temperature-sensitive, and it has a rated permissible operating temperature range of -8 to 60 degrees Celsius. It has approximate mounting dimensions of 5.5 x 3.0 x 3.0 inches and an average shipping weight of 3.0 pounds.