Siemens 6EP1931-2EC21 SITOP DC UPS MODULE 24 V/15 A UNINTERRUPTIBLE POWER SUPPLY WITHOUT INTERFACE. SITOP DC UPS module 24 V/15 A uninterruptible power supply without interface input: 24 V DC/16 A output: 24 V DC/15 A. It belongs to SITOP DC UPS. Recorded manufacturer technical characteristics include IP Rating: IP20; Protection Class: III; Input Voltage Range: 22 ... 29 V DC; Short-circuit proof: Yes; Rated Output Current: 15 A; Input Voltage Rated Value: 24 V DC; Reverse polarity protection: Yes; Efficiency (Normal Operation): 96.2 %.