Relay nthawindi chida chowongolera chomwe chimagwiritsa ntchito mfundo yamagetsi kapena mfundo zamakina kuti zikwaniritse kuchedwa kwa nthawi. Ili ndi mitundu yambiri, monga mtundu wa mpweya, mtundu wamagetsi ndi mtundu wamagetsi. Kutumiza kwa nthawi kumatha kugawidwa m'mitundu iwiri: mtundu wa kuchedwa kwanthawi yopatsa mphamvu komanso mtundu wa kuchedwa kwanthawi yozimitsa. Kutumiza kwanthawi konyowa ndi mpweya kumakhala ndi kuchedwa kwakukulu (0.4 ~ 60s ndi 0.4 ~ 180s), ndikosavuta pamapangidwe, koma osalondola.
Koyiloyo ikapatsidwa mphamvu, zida ndi pallets zimakopeka ndi pachimake ndikusunthira pansi nthawi yomweyo, kupangitsa kuti kukhudzana kwanthawi yomweyo kuyatse kapena kuzimitsa. Koma ndodo ya pisitoni ndi lever sangathe kutsatira zida pamodzi ndi dontho, chifukwa chapamwamba mapeto a pisitoni ndodo chikugwirizana ndi nembanemba mphira mu mpweya chipinda, pamene pisitoni ndodo mu kumasulidwa kwa kasupe anayamba kusuntha pansi, nembanemba mphira pansi concave, mpweya chipinda pamwamba mpweya amakhala woonda ndi pisitoni ndodo ndi wonyowa ndipo pang'onopang'ono kugwa. Patapita nthawi, pisitoni ndodo pansi pa malo enaake, izo kukankhira kuchedwa kukhudzana kanthu mwa lever, kuti zazikulu yopuma kukhudzana kuzimitsa, zamphamvu kukhudzana kutsekedwa. Kuchokera pa koyilo yopatsidwa mphamvu mpaka kuchedwetsa nthawi kuti mumalize kuchitapo kanthu, ino ndi nthawi yochedwa kutumizirana mauthenga. Kutalika kwa nthawi yochedwa kungasinthidwe posintha kukula kwa bowo lolowera m'chipinda cha mpweya ndi screw. Koyilo yokopa ikatha kuchotsedwa mphamvu, cholumikizira chimabwereranso pochita kasupe wochira. Mpweya umatulutsidwa mofulumira kudzera mu dzenje la mpweya.