2 Position Rotary Switch

[emretelci]

Hi there,

I am looking for a two position rotary switch for the power switch of a tube amp I am building... (220VAC)

I have seen many but I am confused... I need a simple, small and quality one. Any recommendations?

Thanks...

 

[Mooly]

Something like this,

LORLIN - RMS1035 - Rotary Switch, RMS Series, Non Illuminated, 45 °, 4 A, 10 A, 250 V | CPC UK

 

[emretelci]

Thank you Mooly. I am looking at it...

 

[emretelci]

@Mooly

Thank you for the suggestion. The switch body is plastic. I'd be tightening the M10 nut on plastic threads. It wouldn't take much torque to strip the threads.

Also, the shaft appears to be plastic too. Even though it's available with a flatted shaft, I'd be tightening the knob's set screw into plastic. Not good engineering practice, and the plastic shaft would swell and stick in the knob.

So do you think there is metal option for a similar thing?

 

[Mooly]

I've not seen a metal one on my travels.

The plastic (nylon) is tough. You won't strip any threads by securely tightening its fixing nut and the set screw would certainly bite into the shaft but it won't deform it. I've never had issues with plastic parts similar to these.

 

[ZUM911]

I've gotten switches like you are after from Apex Jr.Home Page
All metal and good quality. I don't see them listed now but I'd contact him to see.

 

[DF96]

Using plastic parts for a mains switch may make the insulation and distance requirements easier to meet.

 

[emretelci]

Thank you all... What do you think for this, anyone used before?

M3786/35-025 Grayhill | Mouser

 

[Mooly]

Look at the current rating. 0.2 Amps 'aint gonna be enough I'm afraid. It might work... just the once 😉

 

[emretelci]

Look at the current rating. 0.2 Amps 'aint gonna be enough I'm afraid. It might work... just the once 😉

Hey Mooly,

Sorry that I am not into electronics that much. Is 0.2 Amps not suitable for 220VAC power switch? 🙄

 

[Mooly]

0.2 amps is a very small current, about the same as a 50 watt mains bulb would draw on 230 volts. And that is an absolute maximum 'resistive' rating.

An on/off switch for an amplifier needs to be rated high enough to withstand not just the steady state current but also the arcing that occurs each time the contacts make and break as they switch the highly inductive load of the transformer.

 

[emretelci]

Thanks Mooly, I think I am going to use the one you have suggested... Cheers..

 

[Mooly]

I'm sure you won't have any problems with them. Good luck 🙂