Let me help clear everything up.
The datasheet for the relay we use is at
https://industrial.panasonic.com/ac/cdn/e/control/relay/signal/catalog/mech_eng_tx.pdf
The DC rating is actually the lower of 2A or 60W. Which means at 56V (48V
nominal) you only get around 1A out of it.
An equivalent amount of AC power won't be a problem. Relays generally are
happier with AC than DC. A twin (different brand) of this relay that we
used to use states 125VA (roughly the same as W) is the max for AC.
Another item which often comes up is why don't we put a heavier duty relay
in the unit? The answer is rather simple: We're mindful that our
customers have a lot of 48VDC floating around, and that particular relay
has a rather high DC wattage rating For example, the datasheet for a
common 5A relay is only rated at 10W @ DC, so at 48VDC you can only switch
around 0.2A, or 1/5th of the current that the relay we use. If I could
find a reasonably priced and more importantly physically sized DC relay
which actually switched more than 1A at 48VDC we'd switch to it.
On Mon, Sep 21, 2020 at 1:44 PM Ken Hohhof <af...@kwisp.com> wrote:
> The issue Mark is talking about is that relay contact ratings are lower
> for DC because AC arcs are self-extinguishing.
>
>
>
> On the other hand, AC is RMS and the peak will be higher, so technically
> 24VAC is around 34V peak on a sinewave. But I suspect you’d be fine.
>
>
>
> *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Bill Prince
> *Sent:* Monday, September 21, 2020 2:28 PM
> *To:* af@af.afmug.com
> *Subject:* Re: [AFMUG] Site Monitor Relay Question
>
>
>
> He was talking about the output, so I assume we're talking about the
> voltage that's being switched, not the input.
>
>
>
> bp
>
> <part15sbs{at}gmail{dot}com>
>
> On 9/21/2020 12:25 PM, Mark Radabaugh wrote:
>
> Are we talking about AC on the contacts?
>
>
>
> Coil will only work with what it’s specified for (AC or DC).
>
>
>
> Contacts will be fine with AC if they have a DC rating. The inverse
> isn’t necessarily true.
>
>
>
> Mark
>
>
>
> On Sep 21, 2020, at 3:17 PM, Bill Prince <part15...@gmail.com> wrote:
>
>
>
> But the reverse is generally not a problem. AC RMS current is much less
> demanding than continuous DC current.
>
>
>
> bp
>
> <part15sbs{at}gmail{dot}com>
>
> On 9/21/2020 9:40 AM, ch...@wbmfg.com wrote:
>
> I have had AC coil relays get stuck closed with putting DC on them.
>
>
>
> *From:* TJ Trout
>
> *Sent:* Monday, September 21, 2020 10:30 AM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] Site Monitor Relay Question
>
>
>
> it will work fine
>
>
>
> On Mon, Sep 21, 2020 at 8:34 AM <ch...@wbmfg.com> wrote:
>
> Yes, some do. Some will get magnitized if they are AC relays and you use
> DC
> on them.
>
> -----Original Message-----
> From: Nate Burke
> Sent: Monday, September 21, 2020 9:29 AM
> To: Animal Farm
> Subject: [AFMUG] Site Monitor Relay Question
>
> The Specsheet for the 4 channel relay output unit says 1A@24VDC. I want
> to control some HVAC Dampers that are running at 24VAC. The Relay
> doesn't care if it's VAC or VDC right?
>
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