How to calculate DC switch amperage if AC amperage is known ?

[stormalong]

Originally Posted by Kolchac

Consider, that your switch switches the power, means A multiply by V. So if you need to switch 100V and you expect 1A you can use 1V 100A switch. Also, and it is important, you have to use 3-5 times more powerful switch than calculated max. Does not matter AC or DC. BTW, connecting LED, you should check the polarity.
Very strange to read comments from people, who understand nothing in electricity.

Wow, amazing that you claim to know something about electricity. Why don't you try carrying 100 amps at one volt in a 1 amp switch. The contacts will melt. Just like dc wiring has to be much heavier at low voltages so do switches. When a switch is closed ideally it has near zero resistance and near zero voltage drop so it is all about the current flow. The current interruption, ie operating the switch is like operating an arc welder - those contacts will be burnt in no time flat at 100 amps.

[Cadence]

Originally Posted by Kolchac

Consider, that your switch switches the power, means A multiply by V. So if you need to switch 100V and you expect 1A you can use 1V 100A switch. Also, and it is important, you have to use 3-5 times more powerful switch than calculated max. Does not matter AC or DC. BTW, connecting LED, you should check the polarity.
Very strange to read comments from people, who understand nothing in electricity.

It sounds as if you are in your afore mentioned category. I little knowledge is dangerous.

[john manning]

Aside from the amperage question which others here have already answered, is your switch connected correctly.

An illuminated switch requires both positive and negative wires connected to it. There will be a negative terminal for the illumination LED.

[GordMay]

Originally Posted by GordMay:
For example, a switch which is rated at 10A 250VAC; 15A 125VAC; 3/4HP 125-250VAC, will be likely to perform satisfactorily at 15 amps up to 30 volts DC (VDC).

Originally Posted by alanrothenbush

I'm not sure I agree. It might perform satisfactorily for a while, but I suspect that long term life might well be a different story...

I don’t entirely disagree with your disagreement.
But, as I previously noted:
My previous post quoted Carling* Technologies’ “Switch Learn More Pages”.
Specifically, “Amp Ratings, HP, Volts”
➥ https://www.carlingtech.com/amp-hp-volts

*Carling are one of the prime manufacturers of switches & breakers, used on boats.