Question on Current Capacity

[minuteman62-64]

I've got a thermostatic switch that has a rated current of 2.0 amps at 250 volts. Does this mean the max current capacity is 2.0 amps and the max voltage is 250 volts? Or is it a power rating, where the allowable current increases as the voltage applied drops?

I'll be using this in a 12 volt application, so what I actually need to know is the allowable current at 12 volts.

 

[bruceb58]

Re: Question on Current Capacity

2.0 Amps if that's all you know.

Sometimes switches are rated for higher current at lower voltages but the manufacturer needs to state this.

Contact the switch manufacturer. They should be able to give you the DC specs

 

[kahuna123]

Re: Question on Current Capacity

2 amps. Don't confuse power ratings with amp ratings. The contacts are only able to handle 2 amps. The voltage rating is the point at which the switch may arc.

 

[minuteman62-64]

Re: Question on Current Capacity

Got it! Thanks, guys.

This morning I checked the current draw if the device I want to power (a buzzer) and, based on my trusty HF multi-meter, it only draws 180 mA - so not a big issue in any event. Looks like if I use a 1 amp fuse it will be protected and function just fine.