Hi, so I'm not an engineer and I don't know nothing at all on this topic.

These days when I tried to power on my amp, the switch button broke. Now I'm looking for another switch, which is a 2-way, 250V, 10A, 4 pins. Now my question is: Can I use a switch that has more or less than 10A? and why?

Thanks!

 

It will be rated at 10A to take the transformer's inrush current, so don't use anything lower. There will be plenty of 16A rated switches available and they would be OK.
If it is a rocker switch, then pay attention to the specification as there are two almost identical standards for the mounting hole that it snaps into, and they are not interchangeable.

 

Hi, so I'm not an engineer and I don't know nothing at all on this topic.

These days when I tried to power on my amp, the switch button broke. Now I'm looking for another switch, which is a 2-way, 250V, 10A, 4 pins. Now my question is: Can I use a switch that has more or less than 10A? and why?

Thanks!

YES, a switch rated to carry more than ten amps will safely handle a smaller load current. The rating is the maximum value allowed for the product claimed lifetime. The only possible challenge would be the physical dimensions of the switch.
One caution is that the 4 pin switch is switching off both sides of the mains power, so be sure to connect the replacement with the same arrangement.

 

Please report when this repair is completed, it is good to know that advice has worked out.