The utility model relates to a technical field of distribution transformer protection, more specifically relates to a two protection load switch switch -fuse combination electrical equipment and circuit structure. The utility model discloses an on traditional load switch switch -fuse combination electrical equipment's basis, increase and synthesize overload protection device and current transformer, monitor the current through setting up of current transformer: when load normal operating, synthesize overload protection device and be failure to actuate, when abnormal conditions appearing, synthesize overload protection device and realize constant time -lag overcurrent protection to the cabinet of being qualified for the next round of competitions, when taking place short -circuit fault, thecurrent increases several times suddenly, and the fast express -melting of fuse is disconnected, and excision short -circuit fault reaches the quick -break effect. The utility model discloses an investment cost is little, and the running cost is low, has overcome the problem that the fuse can not accurately be confirmed must change after load current action value and the protection action at every turn by the slow shortcoming of circuit breaker protective reaction speed and traditional combined electrical apparatus, and the realization is to the constant time -lag overcurrent protection of the cabinet of being qualified for the next round of competitions and quick -break protection's duplicate protection.