Key rating that matters
The 6ES7193-7DB20-0AA0: This module doesn’t have a rated current or voltage of its own—it’s a mechanical-electrical backplane. What matters is the redundant power supply module it accepts: the unit covers both 120/230 V AC and 24 V DC inputs (via the fitted PSU), and the TM-PS-B provides the Ex e increased-safety enclosure and the ia/ib intrinsic safety barrier connections. If your BOM calls for a redundant PSU on an ET200iSP segment in an Ex area, this is the specific backplane to order.
