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Don tsawaita rayuwar sabis na motar motar DC, ana amfani da na'urori masu kariya da masu kula da motoci don kare shi daga lalacewar injiniya, danshi mai yawa, matsananciyar dielectric da yawan zafin jiki ko yawan zafin jiki.Waɗannan na'urori masu kariya suna jin yanayin kuskuren motar kuma ko dai suna sanar da ƙararrawa don sanar da ma'aikaci ko kashe wutar lantarki ta atomatik lokacin da wani yanayi mara kyau ya faru.Don yanayin da aka yi ɗorewa, ana kiyaye injiniyoyi tare da relays masu ɗaukar zafi.Masu kariyar dumama dumbin zafi suna sanye a cikin iskar motar kuma an yi su daga wasu karafa guda biyu iri ɗaya.An ƙirƙira su ta yadda ɗigon bimetallic za su lanƙwasa a saɓani dabam-dabam lokacin da aka kai wurin saita zafin jiki don buɗe da'irar sarrafawa da kuma rage kuzarin motar.Masu dumama dumama su ne masu kariyar daɗaɗɗen zafin jiki na waje da aka haɗa a jere tare da iskar motsin motsi kuma an ɗora su a cikin mai tuntuɓar motar.Solder tukunyar tukunyar jirgi narke a cikin wani obalodi yanayin, wanda ya sa da'irar sarrafa motor ya kashe kuzarin da mota.Na'urorin dumama na bimetallic suna aiki iri ɗaya da masu kare bimetallic da aka saka.Fuses da na'urorin da'ira sune masu karewa ko gajeriyar kewayawa.

Relays na kuskuren ƙasa kuma yana ba da kariya mai wuce gona da iri.Suna lura da yanayin wutar lantarki tsakanin iskar motar da tsarin ƙasa.A cikin injina janareta, juyar da relays na yanzu yana hana baturi yin caji da motsa janareta.Tun da asarar filin motar DC na iya haifar da gudu mai haɗari ko yanayin saurin wuce gona da iri, ana haɗa hasarar isar da saƙon filin daidai da filin motar don jin halin da ake ciki.Lokacin da halin yanzu filin ya ragu a ƙasan wurin da aka saita, relay ɗin zai ƙara ƙara ƙarfin ƙarfin motar.Yanayin rotor da aka kulle yana hana mota yin hanzari bayan an fara jerin sa.Relays masu nisa suna kare injina daga kuskuren kulle-kulle.Ƙarƙashin wutar lantarki yawanci ana haɗa shi cikin masu sarrafa motoci ko masu farawa.Bugu da kari, ana iya kiyaye injina daga wuce gona da iri ko tashe-tashen hankula tare da keɓe masu canza wuta, kayan kwandishan wuta, MOVs, masu kamawa da masu tacewa.Yanayin muhalli, kamar ƙura, tururi mai fashewa, ruwa, da yanayin zafi, na iya yin illa ga aikin injin DC.Don kare mota daga waɗannan yanayi na muhalli, Ƙungiyar Masu Samar da Wutar Lantarki ta ƙasa (NEMA) da Hukumar Kula da Wutar Lantarki ta Duniya (IEC) sun daidaita ƙirar shingen motoci bisa kariyar muhalli da suke bayarwa daga gurɓatattun abubuwa.Hakanan za'a iya amfani da software na zamani a matakin ƙira, kamar Motor-CAD, don taimakawa haɓaka haɓakar yanayin zafi na injin.