DC-DC Converter, 20 A — Panel Fit and Sourcing
The Siemens 6EP4346-7RB00-0AX0 is a DC-DC converter that takes a 10 to 58 V DC input and delivers a controlled 24 V DC output at up to 20 A. That 20 A rating is the headline number for sizing — it tells you the continuous current the converter can supply to a 24 V DC bus feeding PLCs, sensors, relays, and small valve banks. Efficiency runs at 97.5 %, which means less heat to manage inside a sealed enclosure. The enclosure measures 35 mm wide by 125 mm deep by 135 mm high, fitting a single-module width on the rail.
Termination and Approvals
Push-in terminals accept 0.2 to 10 mm² wire on both input and output sides — solid or ferruled stranded. That covers most panel wiring from signal-level to 20 A power runs without needing ring lugs or bootlace ferrules for the larger sizes. The converter carries cULus listing under UL 508 and CSA C22.2 No. 107.1 (File E197259), plus separate CSA C22.2 No. 62368-1 approval. CE marking is present.
Clearance and Compliance Notes
Required clearance above and below the unit is 45 mm each side for natural convection airflow; left and right clearance is 0 mm, so units can be mounted side-by-side without derating for thermal stacking. Emitted interference meets EN 61000-6-3 (residential/commercial/light-industrial environment); immunity meets EN 61000-6-2 (industrial environment). No ATEX, IECEx, or Class I Division 2 hazardous-location approvals — keep this in general-purpose panels only. MTBF at 40 °C is 8,100,000 hours — roughly 925 years continuous operation. That figure is calculated per Telcordia standards at 40 °C ambient, so it is a reliability benchmark for the design, not a warranty or service-life guarantee.