What this module is, and what it does
The Siemens 6ES7138-7EA01-0AA0 is the 24 V DC power supply module for the ET200iSP distributed I/O system, built for hazardous-area installations. It converts a 24 V DC line-side feed (max. 4 A draw) into backplane power for the Ex-rated I/O stations in an ET200iSP rack. Dimensions are 60 mm wide, 190 mm high, 136.5 mm deep — it drops into the standard ET200iSP slot footprint, same as the I/O modules. Reverse polarity protection on the input saves a service call when the line is down and the tech is in a hurry.
Lifecycle and sourcing reality
Because it's an active catalog item, we source it to order against an RFQ. If you already have the ET200iSP rack in your BOM, this module is the correct power infeed — no cross-reference needed, no last-time-buy scramble.
What the ratings mean for fit
Typical power loss is 20 W — not negligible; make sure your cabinet cooling accounts for that dissipation, especially if the panel has a high density of these racks. The status indicator and diagnostic readable via IM 152 (Ex-specific backplane interface) give you a quick fault-isolation path without opening the Ex zone. CE mark is present, so the module complies with EU directives — no separate documentation hurdle for export or panel certification.