Zaštita od pogrešnog polariteta

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Relej se izabire prema naponu napajanja. Treba voditi računa da kontakti releja moraju izdržati struju napajanja te da bi bilo dobro da su predviđeni za prekidanje DC struje. Prikazani spoj ima prednost u odnosu na upotrebu diode:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700dc00000000.gif" HEIGHT="15" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">nema gubitka napona napajanja</div> <div> <IMG BORDER="0" SRC="Symb075c00b700dc00000000.gif" HEIGHT="15" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">disipacija je tipično 0,5-1W</div> <div> <IMG BORDER="0" SRC="Symb075c00b700dc00000000.gif" HEIGHT="15" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">štiti oba kraja napajanja</div> <bR> <div>      Nedostatci:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700dc00000000.gif" HEIGHT="15" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">disipacija ostaje ista bez obzira na glavnu potrošnju</div> <div> <IMG BORDER="0" SRC="Symb075c00b700dc00000000.gif" HEIGHT="15" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">zauzima više mjesta</div> </td> </tr></table></body>