Siemens 6EP1961-3BA01 SITOP PSE201U Buffer Module/10S. SITOP PSE201U buffer module buffer time 100 ms to 10 s depending on load current. It belongs to Buffer module. Recorded manufacturer technical characteristics include Net weight: 1.2 kg; Backup time: 100 ms to 10 s; IP protection: IP20; Dimensions (WHD): 70 × 125 × 121 mm; Rated input voltage: 24 V DC; Rated output current: 40 A; Operating temperature: -25 to +70 °C.