The Siemens 6ES7138-7EA00-0AA0 is a SIMATIC S7 power supply module for the ET200ISP distributed I/O system, rated at 24 VDC with a typical power loss of 20 W. It occupies 60 mm width on the DIN rail, with a depth of 136.5 mm and height of 190 mm, and carries ATEX certification (II2 G EEx de [ib] IIC T4). Reverse polarity protection is standard, and diagnostic data are readable via an IM 152 interface.
CE mark is listed, together with the KEMA ATEX certification for hazardous locations. The module also includes a status indicator.