Ma miniature circuit breakers ndi zida zamagetsi zomwe zimagwiritsidwa ntchito poyang'anira zamakono ndipo zimagwiritsidwa ntchito kwambiri m'nyumba, malonda, ndi mafakitale. Pakali pano yomwe ili ndi nambala ya 3P imatanthawuza kuchulukirachulukira kwa woyendetsa dera, yomwe ndi yomwe imakhalapo yomwe imatha kupirira pamene mphamvu yamagetsi ikudutsa panopa.
3P imatanthawuza mawonekedwe omwe ophwanya dera ndi fuse amaphatikizidwa kuti apange unit yomwe imakhala ndi chosinthira chachikulu ndi chipangizo chowonjezera choteteza (fuse). Mtundu woterewu wamtunduwu ukhoza kupereka chitetezo chapamwamba chifukwa sikuti umangodula dera, komanso umaphatikizana ndi vuto ngati kuli kolakwika kuteteza zida zamagetsi kuti zisawonongeke mochulukira.