Most transfer switches are latching relays - the coil is only used to switch them from one state to the other. A latching relay does not require power to stay in a given position.
A really simple solution is a contactor (heavy duty relay) with the utility power wired to the coil to hold the relay on when utility power is available with the power wired through the NO contacts (normally open contacts), and the generator power through the NC contacts. Or reverse that so that de-energized relay supplies utility power and when you connnect the generator it pulls in the coil, disconnects the utility, and puts the load on the generator. Mark > On Sep 10, 2020, at 4:43 PM, Chuck McCown <ch...@wbmfg.com> wrote: > > Yep > > Sent from my iPhone > >> On Sep 10, 2020, at 1:31 PM, Adam Moffett <dmmoff...@gmail.com >> <mailto:dmmoff...@gmail.com>> wrote: >> >> >> I wouldn't have thought of that. >> >> Are all transfer switches just relays with an ac powered coil? >> >> >> >> On 9/10/2020 2:01 PM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote: >>> https://www.amazon.com/Enclosed-Pre-Wired-Relay-300VAC-DPDT/dp/B008HOQZ8C >>> <https://www.amazon.com/Enclosed-Pre-Wired-Relay-300VAC-DPDT/dp/B008HOQZ8C> >>> $36.50 Already in a box. >>> >>> https://www.amazon.com/TWTADE-JQX-62F-2Z-Voltage-Electronmagnetic-Relay/dp/B07FCJFGL9/ref=sr_1_19?dchild=1&keywords=120v+relay&qid=1599760852&sr=8-19 >>> >>> <https://www.amazon.com/TWTADE-JQX-62F-2Z-Voltage-Electronmagnetic-Relay/dp/B07FCJFGL9/ref=sr_1_19?dchild=1&keywords=120v+relay&qid=1599760852&sr=8-19> >>> >>> $29.36 >>> >>> Or a pair of simple contactors wired up as a DPDT. >>> >>> >>> From: Sterling Jacobson <> >>> Sent: Thursday, September 10, 2020 11:47 AM >>> To: AnimalFarm Microwave Users Group <> >>> Subject: Re: [AFMUG] Looking for a 20A Auto Transfer Outdoor switch/plug >>> >>> Yeah, yeah. >>> >>> I guess next best thing is to add an outdoor rated reverse twistlock 20A >>> plug to the side of the cabinet and use an internal solution for the >>> automatic transfer part. >>> >>> I’ll go start perusing the RV/Yachting pages for that. >>> >>> From: AF <af-boun...@af.afmug.com> <mailto:af-boun...@af.afmug.com> On >>> Behalf Of Chuck McCown >>> Sent: Thursday, September 10, 2020 11:37 AM >>> To: AnimalFarm Microwave Users Group <af@af.afmug.com> >>> <mailto:af@af.afmug.com> >>> Subject: Re: [AFMUG] Looking for a 20A Auto Transfer Outdoor switch/plug >>> >>> Not sure you will find an auto transfer. But a $10 contractor will do the >>> job, >>> >>> Sent from my iPhone >>> >>> >>> On Sep 10, 2020, at 11:18 AM, Sterling Jacobson < <>sterl...@avative.net >>> <mailto:sterl...@avative.net>> wrote: >>> >>> >>> I should have just asked this here first instead of the Facebook groups. >>> Sometimes people are just so lazy it makes me doubt humanity. >>> All I got out of Facebook so far with this questions is idiots mansplaining >>> hack about things I already know. >>> >>> Anywho: >>> >>> If you know of a product that exists that fits the bill, please point me in >>> the right direction because I’m having a hell of a time finding it. >>> >>> Basically this, but AUTO TRANSFER instead of manual: >>> >>> http://www.steadypower.com/products.php?product=Reliance-CSR201L-Transfer-Switch-%2820A%29 >>> >>> <http://www.steadypower.com/products.php?product=Reliance-CSR201L-Transfer-Switch-%2820A%29> >>> -- >>> AF mailing list >>> <>AF@af.afmug.com <mailto:AF@af.afmug.com> >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> >>> >>> -- >>> AF mailing list >>> AF@af.afmug.com <mailto:AF@af.afmug.com> >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> >>> >> -- >> AF mailing list >> AF@af.afmug.com <mailto:AF@af.afmug.com> >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > -- > AF mailing list > AF@af.afmug.com <mailto:AF@af.afmug.com> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com>
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