240v switch in a 12v circuit

that

Daz2009 wrote: »

I'm looking for a couple of on off on rocker switches for use in a 12v environment.
I've come across some on ebay that are rated the following
15a 250v ac
20a 125v ac

What current would they be capable of taking in a 12 volt circuit ?

For all practical puposes 15A, and 20A respectively. The voltage guideline tells you not to use it above the rated value

Higher voltage ones tend to have more insulation and higher the voltages the bigger the gap between the two points. Jacobs ladder comes to mind, this vid is a bit ott, but you will get the idea https://www.youtube.com/watch?v=lT3vGaOLWqE

Heedtheadvice

jack_pott wrote: »

No, it's the DC switches that have to cope with arcing, AC current reduces to zero every 10ms.

Well in general for low voltage ac switches (such as 240v RMS you are right but that does not apply at higher voltages ( such as 11kv -and some lower voltages where inductively loaded as you have mentioned). But it is unlikely to be a factor in the OP choice of switch:rotfl:. Perhaps I should not have mentioned it originally

Daz2009

So,here's one that on the face of it should do the job
https://www.ebay.co.uk/itm/SPDT-12v-16A-Mini-Rectangle-Rocker-Switch-Car-Boat-Dash-Light-ON-OFF-ON-I-0-II/270850776449?hash=item3f0ff6dd81:g:Q~cAAOSwHsRYD2vY
The description rates it at 16amp 12v but if you look on the switch itself it's 16amp 125v and 10amp 250v

that

Daz2009, what are you going to use the switch for? Also on where are you going to put it? From new, the rectangular switches take a lot more work to fit than the round ones.

The round ones need rear, or sometimes side access to fit, but you just drill a hole.

Daz2009

I'm replacing a faulty switch ......there are no markings on it hence my dilemma

that

Daz2009 wrote: »

I'm replacing a faulty switch ......there are no markings on it hence my dilemma

I know the old maplin (still trading last week, visit the shop?) catalogue had switch dimensions in them, RS and FARNELL (cpc) had them too.

I'd personally buy the switch for to fit the correct and same hole dimensions, rather than a similar look.

Daz2009

The hole isn't a problem, I just want the correct current rating

Frozen_up_north

RS stock number 3985112
12V, 15A, designed for vehicle use. Full datasheet.
https://uk.rs-online.com/

Daz2009

Frozen_up_north wrote: »

RS stock number 3985112
12V, 15A, designed for vehicle use. Full datasheet.
https://uk.rs-online.com/

Unfortunately that's an on off switch, I need an on off on mate

esuhl

There's are 20A @ 12V rocker switches here:
https://www.12voltplanet.co.uk/on-off-rocker-switch-rectangular-20-amps-at-12-volts-with-without-led-illumination.html

I've no idea what an on-off-on rocker switch is, but here is one 16A & 12V:
https://www.12voltplanet.co.uk/on-off-on-mini-rocker-switch-16-amps-at-12-volts.html

What's the difference between position I and II...? Is it just like two switches in one, except that you can't have both on at the same time...?

EDIT: Hmmm... There is no registered business address shown on the 12voltplanet.co.uk website. Isn't that illegal? Not sure whether they're legit or not...