The Siemens 6EP3437-8UB00-0AY0 is a SITOP modular power supply rated for 40 A continuous output, with a 94% efficiency at rated load. It accepts a three-phase input of 400–500 V AC, 45–65 Hz, and delivers a safety extra-low voltage output (SELV) per EN 60950-1 and EN 50178.
The 40 A rating holds over 0 to +60 °C ambient; above that, derate 4% per Kelvin up to +70 °C. That means full output up to 60 °C, then linear reduction — plan your thermal budget accordingly if the cabinet runs hot. The unit is UL 508 and CSA C22.2 No. 107.1 listed (File E197259), so it qualifies for North American panel builds without a separate evaluation. Input protection requires a 3-pole miniature circuit breaker, 10–16 A characteristic C, or a specific Siemens breaker (3RV2011-1DA10 or 3RV2711-1DD10 for UL 489).
Mounts on DIN rail EN 60715 35x15 mm. Input terminals accept 0.5–4 mm² single-core or finely stranded wire (one screw terminal per phase, L2, L3, and PE). Output side: two screw terminals for + (0.5–16 mm²) and three for – (0.5–16 mm²), giving flexibility for parallel feeds or larger cable. Clearance: 40 mm top and bottom, 0 mm left and right — so it can sit tight against adjacent devices side-to-side, but needs breathing space above and below for convection cooling.