Akutumizandi gawo lamagetsi lomwe limagwiritsa ntchito mfundo zamagetsi kapena zotsatira zina zakuthupi kuti likwaniritse "kuyatsa/kuzima" kwa ma circuits. Ntchito yake yayikulu ndikulamulira kuyatsa kwa ma circuits akuluakulu amagetsi/magetsi okwera ndi magetsi/zizindikiro zazing'ono, komanso kukwaniritsa kulekanitsidwa kwa magetsi pakati pa ma circuits kuti zitsimikizire chitetezo cha mbali yowongolera.

Ntchito zake zazikulu zitha kugawidwa m'magulu atatu:

1. Kulamulira ndi Kukulitsa: Imatha kusintha ma signal ofooka owongolera (monga ma currents a milliampere-level omwe amatulutsidwa ndi ma microcomputer ndi masensa a single-chip) kukhala ma currents amphamvu okwanira kuyendetsa zida zamagetsi amphamvu (monga ma mota ndi ma heater), omwe amagwira ntchito ngati "signal amplifier". Mwachitsanzo, m'nyumba zanzeru, ma signal ang'onoang'ono amagetsi omwe amatumizidwa ndi mapulogalamu a pafoni amatha kulamulidwa kudzera mu relay kuti ayatse ndikuzimitsa mphamvu ya ma air conditioner ndi nyali zapakhomo.

2. Kupatula magetsi: Palibe kulumikizana kwa magetsi mwachindunji pakati pa dera lowongolera (voltage yotsika, current yaying'ono) ndi dera lowongolera (voltage yokwera, current yayikulu). Malangizo owongolera amangotumizidwa kudzera mu ma electromagnetic kapena ma optical signals kuti aletse voltage yokwera kulowa mu control terminal ndikuwononga zida kapena kuyika chitetezo cha ogwira ntchito pachiwopsezo. Izi zimapezeka nthawi zambiri m'magawo owongolera zida zamafakitale ndi zida zamagetsi.

3. Logic ndi Chitetezo: Ikhoza kuphatikizidwa kuti igwiritse ntchito logic yovuta ya circuit, monga kulumikiza (kuletsa ma mota awiri kuti ayambe nthawi imodzi) ndi kuchedwetsa kuwongolera (kuchedwetsa kulumikizana kwa katundu kwa nthawi inayake pambuyo poyatsa). Ma relay ena odzipereka (monga ma relay opitilira muyeso ndi ma relay opitilira muyeso) amathanso kuyang'anira zolakwika za circuit. Pamene current ili yayikulu kwambiri kapena kutentha kuli kokwera kwambiri, amadula circuit yokha kuti ateteze zida zamagetsi ku kuwonongeka kwakukulu.