Gabaɗaya -wasan gudun hijira shine ainihin abin sarrafawa da ake amfani da shi sosai a fagen sarrafa wutar lantarki. Yana sarrafa buɗewa da rufewa da'irori ko maɓalli bisa sauye-sauye a cikin shigar da siginonin lantarki (kamar ƙarfin lantarki da na yanzu) ko waɗanda ba - siginonin lantarki (kamar zafin jiki da matsa lamba), samun ikon sarrafawa ta atomatik da ayyukan kariya.
Daga ka'idar aiki, gabaɗaya{0}maƙasudin isar da saƙo yana aiki da farko bisa ƙa'idar shigar da wutar lantarki. Lokacin da nada ya sami kuzari, ƙarfin lantarki yana jan hankalin ƙwanƙwasa, yana sa lambobin sadarwa su rufe ko buɗewa. Domin gama-garin na'urorin lantarki na gama gari{3}}maƙasudin maƙasudi, jan{4}}a cikin lokaci yawanci yakan tashi daga dubun zuwa ɗaruruwan millise seconds, kuma lokacin sakin ya yi kama da haka, kodayake takamaiman ƙima na iya bambanta dangane da ƙayyadaddun bayanai da ƙirar relay.
Gabaɗaya{0}maƙasudin isar da saƙo yana da nau'ikan tuntuɓar sadarwa daban-daban, gami da buɗe adireshi na yau da kullun, rufaffiyar lambobin sadarwa, da masu canza lambobi. Yawanci buɗe lambobi suna buɗewa lokacin da ba a kunna relay ba kuma a rufe bayan kunnawa; Kullum rufaffiyar lambobi ana rufe su lokacin da ba a kunna relay ba kuma a buɗe bayan kunnawa; masu canza lambobi suna haɗa ayyukan duka biyun, suna ba da damar sauyawar kewayawa. A cikin aikace-aikacen aikace-aikacen, ana iya zaɓar nau'in lambar sadarwa mai dacewa bisa ga buƙatun sarrafawa. Juriyar juriya na gabaɗaya{4}maƙasudin isar da saƙo shine muhimmin ma'auni, yana shafar amfaninsa da azancinsa. Juriyar juriya na ƙaramin janareta-maƙasudin isar da saƙo ya fito ne daga ɗaruruwan ohms zuwa ohms dubu da yawa, yayin da juriyar juriya ta mafi girma-wasan isar da wutar lantarki ya yi ƙasa da ƙasa. Wannan don tabbatar da cewa ana iya wuce isasshiyar halin yanzu don samar da ƙarfin lantarki da ake buƙata. Daidaitawar muhalli na gama-gari{10}maƙasudi shi ma yana da mahimmanci; dole ne ya iya aiki akai-akai a ƙarƙashin wasu yanayi na muhalli, kamar zazzabi, zafi, da tsayi.
Misali, wasu na gabaɗaya{0}maƙasudin relays na iya aiki da ƙarfi a cikin kewayon zafin jiki na -25 digiri zuwa digiri 70, tare da ɗanɗanon zafi ya kai kusan 95%, kuma yana iya daidaitawa zuwa tsayin mita 2000 ko ma sama. Rarraba ta aikace-aikace, ana iya raba maƙasudin maƙasudin gabaɗaya zuwa relays masu sarrafawa da relay na kariya. Ana amfani da relays masu sarrafawa da yawa a cikin tsarin sarrafawa ta atomatik don aiwatar da sarrafa dabaru na da'irori; Ana amfani da relay na kariya don kare kayan aikin lantarki daga wuce gona da iri, da rashin ƙarfi, da rashin ƙarfi, da sauri yanke da'ira lokacin da yanayi mara kyau ya faru.
