[PSUBS-MAILIST] relay's

[Sean T. Stevenson via Personal_Submersibles]

Be careful with that.  At such low voltages, I suspect its unlikely to
be a problem, but you can only guarantee isolation up to the rating. 
Going over current is a bigger problem, because components get hot and
fail by melting, welding, or in some cases, starting electrical fires (I
presume that you do have fuses / breakers installed?)  Higher voltages
can potentially break through insulators or jump circuit traces, in
which case the relay would fail, but still not expose you to anything
dangerous else it wouldn't have passed CSA / UL.  Again, 36 V DC
wouldn't worry me, but I would definitely test it first to make sure it
will do what you want.  Ratings are given for a reason.

Incidentally, standard hardware store electrical tape, when applied
without stretching it, provides about 600 V of isolation.

Sean


On 2016-05-08 06:05, hank pronk via Personal_Submersibles wrote:
> Hi Sean,
> Thanks' , I was thinking to use 12 v to activate the relay and run 36v
> through the load side.  I just want to be sure the relay rated at
> 30\40 A at 12 V can handle 20A at 36 V on the load side.   So my amp
> draw is less than rated but my voltage is higher than rated.
> Hank
>
>
> On Saturday, May 7, 2016 7:16 PM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> You can't necessarily use a relay at higher than designed voltage. The
> coils are specific to a particular voltage and type (AC / DC).   On
> the load side, you can use any voltage and current within the rated
> maximums.
> Sean
>
>
> On May 7, 2016 7:00:23 PM MDT, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>     Hi All,
>     I have some 30\40 amp 12 volt relays, what would the rating be at
>     36 volts.  Would they still be at 30\40 amp or 1\3 that.
>     Hank
>     ------------------------------------------------------------------------
>

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