The PS-100 is a 30W external power supply for SR-1000/S chassis. The PS-100 features universal input voltage of 100-240VAC, 50/60 Hz and is 78.6% efficient. When the output gets short-circuited, the input power will reduce itself for self-protection. As soon relieving the short-circuit the product will recover itself to be normal. FCC docket 20780 Class B standard.