> I'm designing a PCB that needs to be able to handle at least 5 A, 
> preferably up to 15 A.

> Right now I'm using PCB screw terminals, but the ones I'm using are 
> rated at no more than 4 A.  This is ok as in the prototype I'm only 
> handling 1 A or so max.  I thought of spade lugs, which can handle 
> 15 A easily, but they tend to be somewhat bulky.

There is a world full of high power connectors and a competent 
connector supplier will be able to advise.
If it's for in house use or where specialists use the connector then 
an XLR connector may meet your need.
Very available, OK price.

eg the dread Maplin say

        http://www.maplin.co.uk/Free_UK_Delivery/3-Pin_XLR_Plug_1025/3-Pin_XLR_Plug_1025.htm

They rate this one at 15A, 120 VAC. DC rating probably similar if not 
using as a power make break switch very often.
Contact resistance of 5 milliohm max would give under 0.1v drop per 
contact at 15A and about 2.5 watts loss for two contacts. You can buy 
versions with more pins which would make it less likely that someone 
would plug a microphone into it :-).

A standard IEC mains connector may work well for you. Again, beware 
what people may plug into it :-(.

Do note that specs may vary with specific product and checking the 
proper spec sheet is always wise.


        RM

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