Patent ID: 8351171
Filing Date: 2013-01-08
Classification: H02H

Abstract:
1. A monitor control system for an electrical distribution system, comprising a trip unit for a circuit breaker operational in at least three modes including a normal operation mode, a safety mode and a maintenance mode; at least one sensor associated with the electrical distribution system and coupled to the trip unit, wherein the at least one sensor is connected to one or more components of the electrical distribution system to detect whether the electrical distribution system will be or is being serviced when a presence of a human being is also detected; and a selector coupled to the trip unit and configured to select the maintenance mode to define a mode of operation of the trip unit when the electrical distribution system will be or is being service and when the presence of the human being is also detected, wherein in the maintenance mode at least one of arc flash reduction and tripping delay reduction greater than in the safety mode are provided such that the trip unit operates based on the maintenance mode.