Siemens sitop ups1600 ups and sitop ups1100 battery modules siemens 6ep4136 3ab00 1ay0 this 20a 24v ups is a din rail mounting unit that when used in conjunction with a battery module provides an uninterruptible 24v dc supply the sitop ups manager supports configuration and monitoring for pc based systems and the software is free to download siemens 6ep4136 3ab00 1ay0 din rail mounted ups