Siemens 6EP4231-7HC00-0AX0 SITOP BUF1200 Buffer Module. SITOP BUF1200 buffer module Buffer time 300 ms at 40 A buffer time dependent on load current 24V DC input. It belongs to Buffer module. Recorded manufacturer technical characteristics include Depth: 155 mm; Width: 70 mm; Height: 135 mm; Net weight: 1.2 kg; Buffer time: 300 ms at 40 A; IP protection: IP20; Input voltage range: 20 ... 30 V DC; Rated output current: 40 A.