
I have used these over the years as a kid in school, for science fairs.
For anything else, do some hunting for a REAL knife-switch... One made with solid copper contacts, knives, and mounted to a porcelain block.
They're found as antiques, and the newest ones date from the 1940s. Leviton used to make them, they came in DPDT, fused DPST, SPDT, and SPST. They were rated 120volts/30 amperes.
this sucks dont buy
great