# Switch current rating - actually current or really wattage rating?

I'm trying to build a dummy load for some power supply testing using some very large power resistors. Basically I will wire up the resistors in parallel and connect more if I want to decrease the resistance and therefore increase the current draw.

I want something to switch on each of these resistors. I thought maybe I could just buy some cheap wall switches but the ones I find are only 15-20A rated @ 125V AC but the testing I want to do could go to as much as 35A at 5V DC. I noticed that the switches would often be rated for 10A @ 240V and 20A @ 120V. Since I'm running such low voltage and only DC, could I run much higher than 20A?

• Why not just connect the ground with an alligator clip and then touch leads to suddenly apply load? Jul 29, 2014 at 19:07
• Also you might want to consider writing questions with more than two run-on sentences. Jul 29, 2014 at 19:09
• Because I want something a little fancier than an alligator clip. Jul 29, 2014 at 19:22
• But...its just testing, it isn't anything anybody will see. It will give you the purest results. Jul 29, 2014 at 19:27
• possible duplicate of Calculating current load for a switch? Jul 29, 2014 at 19:30