a relay socket receiving a relay, the relay socket comprising a plurality of openings each having a same size and a same shape;

a power source connected to the relay socket; and

a positive temperature coefficient thermistor (PTC) connected between the relay socket and the power source, wherein the PTC is directly connected to a positive side of the power source, wherein the relay is connected to the relay socket via a plurality of pins, and wherein the relay includes an integrated diode directly connected between two pins of the plurality of pins, and wherein a third pin of the plurality of pins is directly connected to a negative side of the power source.