Mai watsa lokacina'urar sarrafawa ce da ke amfani da ƙa'idar lantarki ko ƙa'idar injiniya don cimma nasarar sarrafa jinkirin lokaci. Tana da nau'ikan iri-iri, kamar nau'in damƙar iska, nau'in lantarki da nau'in lantarki. Ana iya raba relay na lokaci zuwa nau'i biyu: nau'in damƙar lokaci mai ƙarfi da nau'in damƙar kashe lokaci. Relay na lokaci mai damƙar iska suna da babban kewayon jinkiri (0.4 ~ 60s da 0.4 ~ 180s), tsari ne mai sauƙi, amma ba shi da daidaito.
Idan aka kunna na'urar, sai armature da pallets ɗin su fara motsawa nan take, suna kunna ko kashe aikin nan take. Amma sandar piston da lever ba za su iya bin na'urar tare da faɗuwa ba, saboda ƙarshen saman sandar piston yana haɗe da membrane na roba a cikin ɗakin iska, lokacin da sandar piston a cikin sakin bazara ta fara motsawa ƙasa, membrane na roba ya faɗi a kwance, ɗakin iska da ke sama da iska ya zama siriri kuma sandar piston ta jike kuma ta faɗi a hankali. Bayan wani lokaci, sandar piston ta faɗi zuwa wani matsayi, za ta tura aikin tuntuɓar jinkiri ta cikin lever, don haka rufewar wutar lantarki ta rufe, hulɗar wutar lantarki ta rufe. Daga na'urar wutar lantarki zuwa hulɗar jinkirin lokaci don kammala aikin, wannan lokacin shine lokacin jinkirin relay. Ana iya canza tsawon lokacin jinkiri ta hanyar daidaita girman ramin shiga ɗakin iska da sukurori. Bayan an rage ƙarfin jan hankali, relay ɗin ya murmure ta hanyar aikin maɓuɓɓugar dawowa. Iska tana fitar da sauri ta cikin ramin fitar da iska.