The Siemens 6EP1933-2NC11 is a DC buffer module that holds up the 24 V DC bus through short mains dips using internal capacitor storage. Rated for 7 A continuous output with a peak of 22.5 A, it delivers 168 W of active power and stores 10 kW·s of energy — enough to ride through a typical half-cycle dropout or sequence a controlled shutdown. The IP65 enclosure (470 mm wide × 80 mm deep × 80 mm high) makes it suitable for washdown areas or dusty environments where a standard IP20 buffer would need a separate cabinet.
The 24 V ±3 % output matches the standard 24 VDC control voltage. The 7 A continuous rating covers a moderate control cabinet. The 22.5 A peak handles inrush loads.
Screw mounting — no DIN-rail clip, so plan for four fasteners through the enclosure flanges. The 470 mm width is substantial; it will not fit a standard cabinet depth if rear access is needed.
Connections and indicators
Power connections are via plug-in connector sets — no hardwired terminals, so you can pre-wire the cabinet and slide the module in last. A USB interface is on board for PC-based diagnostics or firmware updates. Status LEDs give clear feedback: green (OK) for normal operation, yellow (BAT) when buffering, red (ALARM) for pre-warning or lack of buffer standby, and green (CAP. > 85%) when the capacitor bank is charged above 85 %. That last one is handy during commissioning — you can see at a glance whether the module is ready to ride through a dip.