Mai jujjuyawa yana nufin na'urar da za ta iya rufewa, ɗauka, da karya halin yanzu a ƙarƙashin yanayin da'ira na al'ada kuma tana iya rufewa, ɗauka, da karya halin yanzu ƙarƙashin yanayin da'ira mara kyau a cikin ƙayyadadden lokaci. Ana iya amfani dashi don rarraba makamashin lantarki akai-akai. Yana fara motar asynchronous kuma yana kare layin wuta da motar. Yana iya yanke da'ira ta atomatik lokacin da nauyi mai nauyi, gajeriyar kewayawa, rashin ƙarfi da sauran kurakurai suka faru. Ayyukansa yayi daidai da haɗuwa da fuse switch da overheating da relay underheating, da dai sauransu, kuma gabaɗaya babu buƙatar canza kayan aiki bayan karya halin yanzu. An yi amfani da shi sosai.
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