SS-48/I, SS-48/II series time relays are static digital time relays that generate standard input signals using quartz crystal oscillators. They use CMOS integrated circuits to form a logic circuit and set the delay value through one or two sets of three bit BSD code toggle switches. The SS-46 model adopts the shell structure of DS-110 and 120 series, which can replace DS-100 and 120 series time relays. The SS-47 model adopts a DS-20 housing, which can replace the DS-20 series time relay. The SS-48 model adopts the DS-30 series housing and can replace the DS-30 series time relay.

SS-48/I, SS-48/II series time relay