PURPOSE: To facilitate inspection and enable preventive measures by providing a normal current indicator, a dangerous current indicator, and a nonenergization indicator visible even from a great distance, a load circuit and all, on the surface of a breaker body used for a distribution board.

CONSTITUTION: A breaker is attached, a load circuit and all, to a distribution board, a switchboard, or the like. A normal current indicator 2, a dangerous current indicator 3, and a nonenergization indicator 4 visible even from a great distance is attached to the surface of a breaker body 1. The normal current indicator 2 indicates the condition that the breaker is used normally within the tolerable range. The dangerous current indicator 3 indicates the condition that the current above the threshold current near to the break current of the breaker is flowing. Moreover, the nonenergization indicator 4 indicates the condition that a current is not flowing to load. Hereby, the inspection is performed easily, and also a preventive measure is taken.