The Siemens 6EP3333-6SB00-0AY0 is a 24 V DC regulated power supply from the SITOP PSU8200 series, rated for a continuous 4 A output. Input accepts 100–240 V AC at 47–63 Hz, so it handles both 50 Hz and 60 Hz line feeds without adjustment. The 24 V DC output is galvanically isolated, delivering SELV per EN 60950-1 and EN 50178 — meaning the output is safe to touch and suitable for powering PLCs, sensors, and I/O modules in a control panel.
The headline rating is 4 A continuous at 24 V DC, but that's only valid up to +55 °C ambient. Above that, up to +70 °C, you derate 2 % per Kelvin — so at 60 °C you're looking at about 3.6 A usable, and at 70 °C roughly 2.8 A. If your cabinet runs hot, size the load accordingly. The internal fuse is rated for a maximum I²t of 2.5 A²·s, which limits inrush. The recommended upstream protection is a 10 A B-curve or 6 A C-curve miniature circuit breaker — that's the feeder breaker spec, not the output load breaker. MTBF at 40 °C is listed at 2,391,480 hours — roughly 273 years of continuous operation. That's a calculated figure under ideal conditions, but it tells you the design is solid-state and fanless, with no wear items beyond the electrolytic caps.
Mounts via snap-on to DIN rail EN 60715, or can be direct-mounted in different positions. Clearance: 20 mm top and bottom, zero left and right — so you can pack units tight side-by-side, but need breathing room above and below for convection cooling. No ATEX or IECEx certification, so not for hazardous locations.
Approvals and compliance — what the nameplate carries
cULus-Listed under UL 508 and CSA C22.2 No. 107.1 (File E197259), plus cURus-Recognized under UL 60950 and CSA C22.2 No. 60950 (File E151273). Also carries CE and EAC marks, plus DNV GL marine type approval. No NEC Class 2 rating, no FM registration, no UL hazloc.