Patent Number: 8,797,720

Title: Manually-controlled arc flash energy reduction system and method for circuit breaker trip units

Abstract: A circuit protection system has a normal mode, and a maintenance mode with reduced potential arc flash energy. A downstream circuit breaker is mounted within a first enclosure comprising a first access panel. A locking mechanism locks the first access panel closed. An upstream breaker is mounted within a second enclosure comprising a second access panel. A current sensor senses current and is in communication with an electronic trip unit that controls current interruptions by the upstream breaker based on a trip setting. A user interface device is accessible when second enclosure is closed, and allows user selections of normal and maintenance modes. When maintenance mode is selected, the trip unit changes the trip setting such that potential arc flash energy is reduced. The system is configured to keep the first access panel locked closed based on normal mode being selected, and allow unlocking based on maintenance mode being selected.

Inventors: Weiher; Helmut (Auburn Township, OH), McGuinness; Sean (Mentor, OH)

Assignee: Utility Relay Company

International Classification: H02B 1/32 (20060101); H02H 3/00 (20060101); H02H 9/08 (20060101)

Expiration Date: 8/05/12018