I have an old firelpace, and the main switch (originally a circuit for a variable resistor) broke and the old owners just rewired around the circuit board(cut the lines from it). I want to place a switch on one of the the lines. But the only switches I found were all rated at 3A 125VAC, 1.5A 150VAC. There is no circuit boards, and all lines are directly connected. Will the switches I have be safe to use, and now blow up/ catch fire?