The present invention relates to a device to display the operation status of a branch breaker and an operation cause by forming a plurality of branch breakers installed in a distribution board and a bus bar forming a branch line connected to each of the branch breakers. The present invention comprises: a current detecting part combined with each branch line of a bus bar connected to a branch breaker to detect a current of each branch line; a plurality of branch MICOMs including each ADC connected with each current detecting part to convert the detected current into a digital signal, each measurement part reading the current value converted through the ADC by microsecond to measure an effective value and a maximum value or waveform of an alternating current in real time, and each storage part updating and storing the current value of a predetermined time measured through the measurement part; a main MICOM communicating with the measurement part of the branch MICOMs by millisecond to sense that the branch breaker is operated when a current value measured from the branch line is 0, and including a comparing part comparing a measurement current value stored in the storage part of the branch MICOMs to a rated current value of the branch breaker, an analyzing part analyzing an operation cause of the branch breaker by calculating the current values compared through the comparing part, and a transmitting part transmitting a result analyzed through the analyzing part to the outside; and a display part receiving the result transmitted through the transmitting part of the main MICOM to display the result. Therefore, when the branch breaker is operated, the operation status and the operation cause of the branch breaker are informed.;COPYRIGHT KIPO 2019
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