A Mai Katse Wutar Lantarkina'urar sauyawa ce wadda za ta iya yanke wutar lantarki ta atomatik lokacin da da'ira ta fuskanci nauyin kaya, gajeren da'ira ko wasu yanayi marasa kyau, tana kare da'irar da kayan aiki. Dangane da yanayin amfani, ƙa'idar aiki da matakin ƙarfin lantarki, ana iya ƙara rarraba masu karya da'ira zuwa nau'ikan da dama:

An rarraba ta hanyar ƙarfin lantarki mai aiki
Masu katse wutar lantarki mai ƙarancin ƙarfin lantarki (LV): Ana amfani da su a cikin da'irori na gida, na kasuwanci da na masana'antu masu sauƙi, tare da ƙarfin lantarki na gabaɗaya wanda bai wuce 1000V ba. Suna kare da'irori da kayan aikin lantarki. Nau'ikan da aka fi amfani da su sun haɗa da ƙananan masu katse wutar lantarki (MCB) da masu katse wutar lantarki mai siffar case (MCCB).
Masu katse wutar lantarki mai ƙarfin lantarki (HV): Ana amfani da su a masana'antu, tsarin watsa wutar lantarki da rarraba wutar lantarki, tare da ƙarfin lantarki gabaɗaya sama da 1kV. Suna iya yanke manyan kwararar wutar lantarki da kuma kare lafiyar hanyoyin wutar lantarki. Nau'ikan da aka fi sani sun haɗa da masu katse wutar lantarki, masu katse wutar lantarki mai rufi da iskar gas (GIS), da masu katse wutar lantarki.
Rarraba ta hanyar hanyar kashewa ta baka
Mai katse wutar lantarki ta iska (ACB): Yana amfani da iska a matsayin hanyar kashe wutar lantarki kuma ya dace da da'irori masu matsakaicin ƙarfi da ƙarancin wutar lantarki.
Injin kashe wutar lantarki (VCB): Ana kammala kashe wutar lantarki a cikin injin tsabtace iska, wanda ya dace da aiki mai yawan gaske kuma yana da tsawon rai.
Mai karya da'irar mai (OCB): Yana amfani da mai a matsayin matsakaiciyar kashe baka kuma ya dace da layukan wutar lantarki masu ƙarfi.
Mai katse wutar lantarki ta hanyar amfani da iskar gas (SF6 CB): Yana kashe wutar lantarki ta hanyar amfani da iskar gas mai suna sulfur hexafluoride, wanda ya dace da tsarin wutar lantarki mai ƙarfi da ƙarfin lantarki mai ƙarfi.
An rarraba ta hanyar amfani
Mai katse wutar lantarki: Ana amfani da shi musamman don ɗaukar kaya da kuma kariyar da'ira ta gajere.
Na'urar karya da'ira ta nau'in sarrafawa: Ana amfani da ita don sarrafa da'ira ta kashewa kuma tana da aikin kariya.

Masu karya da'ira ba wai kawai suna kare kayan aikin da'ira daga lalacewa ba, har ma suna tabbatar da amincin ma'aikata, suna ƙara aminci da kwanciyar hankali na aikin tsarin, kuma su ne muhimman abubuwa masu mahimmanci a tsarin wutar lantarki na zamani da kuma sarrafa kansa na masana'antu.