# Relay and Switch Help...

#### Dynaman

Joined Jan 17, 2008
66
First time poster...

I was wondering if anybody had any documentation, links, or can tell me why running moderate currents through a switch or relay at high frequencies say 10-15khz vs. 60 hz. shortens the life of the contacts. I am trying to explain the physics, but am having difficulty.

Thanks!

#### scubasteve_911

Joined Dec 27, 2007
1,203
Just a guess, but wouldn't the skin effect have a lot to do with this? Having the current isolated to the perimeter of the conductor and contacts may decrease life.

Steve

#### beenthere

Joined Apr 20, 2004
15,819
Moderate currents at what voltage? 60 ma at 12 volts is .72 watts, but at 60,000 volts is 3600 watts.

#### bloguetronica

Joined Apr 27, 2007
1,372
Moderate currents at what voltage? 60 ma at 12 volts is .72 watts, but at 60,000 volts is 3600 watts.
When talking about relays, current is the factor. It can be 60mA at 12V or 60mA at 60000V. It doesn't matter. Current is the damaging factor for the relay contacts.