# Switch Power Rating

Discussion in 'Electronic Design' started by Mike Miller, Jan 6, 2014.

1. ### Mike MillerGuest

There is a switch that I am considering using for a new design. From the datasheet I can see that there are several current ratings given. For example, 5A, 7A and 10A.

From the datasheet:

Power Rating: 5A/250VAC, 10A/125VAC (UL); 7A/250VAC, 10A/125VAC (CSA); 6A/250VAC~µT85 (D, S, N, FI, VDE)

My application will be using 24 VDC at 10A.

If I am given 125VAC is this 125 * .707 = 88.375 VDC?

Anyone know what the µT85 is?

Thank you.

Mike

Mike Miller, Jan 6, 2014

2. ### Tom MillerGuest

"Mike Miller" <> wrote in message
news:...
There is a switch that I am considering using for a new design. From the
datasheet I can see that there are several current ratings given. For
example, 5A, 7A and 10A.

From the datasheet:

Power Rating: 5A/250VAC, 10A/125VAC (UL); 7A/250VAC, 10A/125VAC (CSA);
6A/250VAC~µT85 (D, S, N, FI, VDE)

My application will be using 24 VDC at 10A.

If I am given 125VAC is this 125 * .707 = 88.375 VDC?

Anyone know what the µT85 is?

Thank you.

Mike

++++++++++++++++++++++++++
You need to find a switch that has the DC rating specified. Switching DC is
in no way similar to switching AC. The 10A/125VAC rating when used for DC
will be much lower, maybe around an amp or so. The reason is the arc that
happens when the circuit is broken. The zero crossing of the AC signal tends
to quench high currents and that does not happen with DC.

You might contact the manufacturer to see what they recommend for your
application.

Tom Miller, Jan 8, 2014