The 140U-J6D3-D20-A-MU circuit breaker is a 100% rated circuit breaker designed and manufactured by Allen-Bradley. This current limiting breaker provides fixed short circuit and overcurrent protection. It offers high interruption ratings for both single and three-phase devices. The breaker comes with three poles. The 140U-J6D3-D20-A-MU circuit breaker can support up to three circuits at a time. This molded case circuit breaker is listed with the UL standards and it meets all the specifications that are necessary to meet the EMC requirements. This is a 140U series circuit breaker that comes with a high interrupting capacity and it also comes with a visible trip indicator on the front. It is also suitable for backfeeding purposes. The circuit breaker is small in size and it has a smaller footprint than other breakers, which helps in saving panel space. The circuit breaker device is ideal for feeder circuits, control circuits, and air conditioning devices. This breaker variant is HACR rated.

The 140U-J6D3-D20-A-MU circuit breaker comes with features like an instantaneous overcurrent release, the definite time delay, and the inverse time delay. This NEMA certified breaker is designed to protect the circuit from overcurrent without damaging itself. The circuit breaker opens automatically when the current reaches the maximum value which can damage the circuit. The 140U-J6D3-D20-A-MU circuit breaker features a long time and a short time trip functionality along with an instantaneous trip function. The breaker comes with electronic trip units which are used for the protection of the circuit breaker. The surrounding temperature must be between -25 and 60 degrees Celsius for regular operation with a humidity level of up to 95%, non-condensing. The breaker can be mounted with a bolt-on mounting base.