Siemens 6EP4136-3AB00-1AY0 SITOP UPS1600 24 V DC/20 A, USB Uninterruptible Power Supply. SITOP UPS1600 20 A USB uninterruptible power supply with USB interface input: 24 V DC output: 24 V DC/20 A. It belongs to SITOP UPS1600 DC UPS modules. Recorded manufacturer technical characteristics include Interface: USB; Efficiency: 98.2 %; Protection class: IP20; Input voltage range: 22 ... 29 V DC; Active power supplied: 480 W; Output current Rated value: 20 A; Input Supply voltage DC Rated value: 24 V; Output voltage DC Rated value (buffering mode): 24 V.