Will this PSU fit the 24 V rail your panel already trusts
The part is a Siemens 6EP3310-6SB00-0AY0, a single-phase DIN rail switched-mode supply rated 3 A at 24 V, with the 3.8 A maximum figure given as both the typical and ceiling load point (cite: cite:). Output current is rated 0 … 3 A across the operating range, derated 2 %/K above +55 °C up to the +70 °C ceiling — meaning the headline 3 A only holds while the cabinet air stays below 55 °C; in a sealed enclosure with summer ambient, the continuous figure drops before the electronics do (cite: cite:). Input accepts 85 … 264 V AC at 47 … 63 Hz or 110 … 300 V DC, so the same unit rides a 120 V control transformer, a 230 V European rail, or a 220 V DC battery-backed plant bus without re-spec (cite: cite: cite: cite: cite:). The wide AC window makes it usable across the single-phase voltages found in most switchrooms and MCC lineups without a step-down transformer ahead of it.
What the agency marks buy you at the tender desk
ATEX, IECEx, FM, and UL hazloc are all absent from the file, so any Ex-area application needs a different SITOP line (cite: cite: cite: cite:). Output is safety extra-low voltage per EN 60950-1 and EN 50178, with internal fusing and an I²t ceiling of 0.8 A²·s — i.e. the inrush profile is bounded enough that a 6 A B-curve or 2 A C-curve MCB on the feeder is the upstream protection Siemens publishes for (cite: cite: cite: cite:).
Mounting, clearance, and panel-side wiring
Snaps onto DIN rail EN 60715 35×7.5/15 and may be mounted in any orientation — the published clearances are 20 mm top and bottom with 0 mm left and right, so the unit sits cleanly between neighbours in a high-density cabinet as long as the airflow path above and below stays open (cite: cite: cite: cite: cite:). That zero side-clearance figure is the panel-space win on retrofit jobs where every DIN slot is already spoken for. IP20 housing — finger-safe at the terminals but not sealed, so it belongs inside an enclosure, not on the machine skin (cite:).
Reliability envelope and lifecycle read
MTBF at 40 °C is published as 2,931,709 h — on the order of three centuries per unit, which is the typical Siemens reliability statement for this class and is the right figure to quote into a tender durability section (cite:). Operating temperature is −25 … +70 °C with natural convection, storage −40 … +85 °C, transport −40 … +85 °C — the unit tolerates a warehouse shelf across a wide climate band before it ever sees a panel (cite: cite: cite:). Availability here runs through independent distribution against an RFQ — quote-level confirmation, with pricing and lead time validated against the BOM line at the time the RFQ is raised, not at order code lookup.