Power switching equipment for boilers used in the heating of regulated water with direct electric current from photovoltaic panels

摘要

Power switching equipment for boilers used in the heating of regulated water with direct current from photovoltaic panels, consisting of a terminal box with a first positive DC terminal (X4) interconnected with a first input terminal (1) of normally open contacts of a first contactor and with a heating element (R) through a sixth output terminal (6) of normally open contacts in the first contact; a first negative DC terminal (X5) being interconnected from the terminal box to the heating element (R); an AC protective earth terminal (X1) of the terminal box is interconnected with a thermostat (T); an AC line terminal (X2) is interconnected with a thermal fuse (TP) and with the thermostat (T) through first normally closed contacts (Y1) of the thermal fuse (TP) and with a first terminal (A1) of the coil of the first contactor through normally closed contacts of the thermostat (T); an AC neutral terminal (X3) of the terminal box is interconnected with the thermal fuse (TP) and with a second terminal (A2) of the first contactor coil through second normally closed contacts (Y2) of the thermal fuse ( TP); a first signaling device (S1) is connected between the second contact output (Y2) of the thermal fuse (TP) and the thermostat output (T); A second signaling device (S2) is connected between an output contact and an input contact of the heating element (R), characterized in that the terminal (X2) of the AC line is interconnected with a seventh input terminal (7 ) of the first contactor (ST1) and with a first terminal (A1) of the coil of a second contactor (ST2) through an eighth output terminal (8) of the first contactor (ST1); the neutral terminal (X3) in AC is interconnected with a second terminal (A2) of the coil of the second contactor (ST2); the first positive terminal (X4) in DC is interconnected with the first terminal (1) of the first contactor (ST1) and with a first input terminal (1) of the second contactor (ST2) and with the second positive terminal (X7) a through the sixth output terminal (6) of the second contactor (ST2); The first negative terminal (X5) in DC is interconnected with the second negative terminal (X6) in DC.