48V DC is the voltage for jobs where current matters more than the voltage itself: telecom racks, PoE nodes, heavy servo drives and drives, long supply runs. At the same power, 48 V draws half the current of 24 V — thinner wire, lower losses on a long line and less terminal heating. That is why 48 V is chosen when the supply sits far from the load or feeds a heavy node. The catalog carries 48V switch-mode DC supplies from three makers: Mean Well (HDR, MDR, DR, NDR, LRS, RSP), Delta Electronics (DRL, DRP, PMT, PMC) and Schneider Electric (ABLS, ABLU3A), in two form factors: compact DIN-rail units and enclosed/panel types for higher currents. All models share a universal 85–264 V input plus overload, short-circuit and over-temperature protection; the upper series add active PFC.
Sizing 48V by power
The logic is the same as on other voltages: add up the current drawn by every load, add a 20–30 % margin and pick the next larger current — but remember that at 48 V the current is halved, so the same node needs less amperage. A small telecom node or sensors is 15–36 W (Mean Well HDR-30-48, 0.75 A, from UAH 747). A mid PoE switch or drive is 75–120 W (Mean Well NDR-120-48, 2.5 A, from UAH 1282). A heavy drive or equipment rack is 240–504 W (Mean Well NDR-240-48, 5 A; NDR-480-48, 10 A, 92.5 % efficiency; RSP-500-48, 10.5 A).
| Model | Current | Power | Mounting | From, UAH |
|---|---|---|---|---|
| Mean Well HDR-15-48 | 0.32 A | 15.4 W | DIN | 515 |
| Mean Well HDR-30-48 | 0.75 A | 36 W | DIN | 747 |
| Mean Well HDR-60-48 | 1.25 A | 60 W | DIN | 899 |
| Mean Well NDR-75-48 | 1.6 A | 76.8 W | DIN | 1101 |
| Mean Well LRS-100-48 | 2.3 A | 110.4 W | enclosed | 709 |
| Mean Well NDR-120-48 | 2.5 A | 120 W | DIN | 1282 |
| Mean Well LRS-150-48 | 3.3 A | 158.4 W | enclosed | 896 |
| Mean Well NDR-240-48 | 5.0 A | 240 W | DIN | 2373 |
| Mean Well LRS-350-48 | 7.3 A | 350.4 W | enclosed | 1373 |
| Mean Well NDR-480-48 | 10 A | 480 W | DIN | 5077 |
| Mean Well RSP-500-48 | 10.5 A | 504 W | enclosed | 4645 |
| Delta PMC-48V600W1BA | 12.5 A | 600 W | panel | 9808 |
DIN vs enclosed, single- vs three-phase
Anything that mounts in a row with breakers goes on the DIN rail — compact and tidy, and up to ~250 W that covers 90 % of jobs. Enclosed cases (LRS, RSP, Delta PMT) win when you need high current at the lowest cost per watt or the source sits outside the main rack. On input: up to 480 W a single-phase 230 V input is usually enough, while heavy racks fed from a three-phase line are best powered by a three-phase unit — Schneider ABLU3A48100 (3-phase, 480 W, DIN) or ABLU3A48200 (3-phase, 960 W) — for a balanced grid load.
What to check before you buy
Current margin — at least 20–30 % over the calculated draw; at 48 V the amperage is lower, but a margin is still needed. Mounting type — DIN rail for a standard rack, enclosed for remote or high-power nodes. Line length — the main 48 V advantage: at lower current the voltage drop on a long cable is smaller, so for remote loads it is the right choice. Input phase — single-phase up to 480 W, three-phase (ABLU3A48100/48200) for three-phase feeds. PFC — Mean Well NDR from 240 W (NDR-240, NDR-480), RSP and Delta DRP add active correction required by code on larger sites. Unsure about the configuration — send us your load list and we will size a unit within 1 business day. How to calculate cabinet power — see the guide how to choose a power supply for an automation cabinet. The full DC-source category lives on the power supplies page.
