Siemens 6EP1961-3BA21 SITOP PSE202U Redundancy Module DC24V/40A. SITOP PSE202U redundancy module input/output: 24 V DC/40 A suitable for decoupling two SITOP power supplies with maximal per 20 A output current. It belongs to Redundancy module. Recorded manufacturer technical characteristics include Efficiency: 96.6 %; Net weight: 0.5 kg; Input voltage DC: 24 ... 28.8 V; Protection class: Class III; Dimensions (WxHxD): 70 x 125 x 120 mm; Power loss typical: 34 W; IP protection class: IP20; Rated output current: 40 A.