Elecraft KPA500 Owner's Manual - Manual (Page 6)

6
Mains Voltage Settings
Your KPA500 is supplied with the power cable you ordered; either one using the 115VAC connector common
in the USA, one with the common European (Schuko) plug for 200 VAC, or the NEMA 6-15P for 240V/15A
outlets. .
CAUTION
Do not connect mains power to your KPA500 or attempt to turn it on before
setting the fuse block switch and internal jumpers to match your supply
voltage as described below; otherwise you may do extensive damage to your
amplifier.
Fuse Block
Check to ensure the fuse block
is set for either 115 VAC or 230 VAC to match your mains voltage. The
current voltage setting is shown in the red window.
If needed, change the fuse block setting as follows:
 Position the rocker switch to off (O) and disconnect the mains cord (if connected). Then open the door
covering the fuse block and then carefully pry the red fuse block out of the holder as shown below:
 Install the proper fuses in the block. Use two 12A fuses for 115V or two 6A fuses for 230V. Use
normal (fast-blow) size 3AG fuses. Both 12A and 6A fuses are supplied in marked envelopes. Note
that the fuse block has a spring contact that presses one end of the fuse outward where it will rest
against an electrical contact when the fuse block is reinstalled in the holder.