MEAN WELL SE-450-3.3 is a single-output enclosed AC/DC switching power supply rated at 3.3 V DC, 75 A and 247.5 W. It provides forced-air cooling and remote sensing. Output ratings are subject to the input-voltage, ambient-temperature and installation conditions below.
Product Datasheet
Download MEAN WELL SE-450 Datasheet (PDF)
This combined SE catalog contains the SE-450 section on pages 1–2; the specification revision is 2024-09-30. Refer to its full mechanical and function drawings when selecting wiring and installation hardware.
The manufacturer datasheet lists a 2-year warranty; coverage is subject to the applicable manufacturer warranty terms.
Model and Output Specifications
| Item |
Specification / condition |
| Complete model |
SE-450-3.3 |
| Datasheet family |
SE-450 |
| Nominal DC output |
3.3 V |
| Rated output current |
75 A |
| Current range |
0–75 A |
| Rated output power |
247.5 W |
| Ripple and noise, maximum |
200 mVp-p |
| Output voltage adjustment |
2.97–3.63 V |
| Voltage tolerance |
±3.0% |
| Line regulation |
±0.5% |
| Load regulation |
±2.0% |
| Typical efficiency |
74% |
Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient.
Ripple and noise: 20 MHz bandwidth; 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors.
Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Input and Start-up
| Item |
Specification / condition |
| AC input range |
90–132 VAC or 180–264 VAC |
| AC range selection |
AC input range selected by switch. |
| DC input range |
254–370 VDC |
| Input frequency |
47–63 Hz |
| Typical AC input current |
10 A at 115 VAC; 6 A at 230 VAC |
| AC surge-current control |
Active surge-current limiting |
| Typical inrush current |
35 A at 115 VAC; 55 A at 230 VAC |
| Leakage current |
<2.5 mA at 240 VAC |
| Setup time |
1500 ms at 115 VAC; 1500 ms at 230 VAC |
| Rise time |
50 ms at 115 VAC; 50 ms at 230 VAC |
| Typical hold-up time |
12 ms at 115 VAC; 16 ms at 230 VAC |
Setup, rise and hold-up times apply at full load and the stated input voltage. Select any required AC input range before operation; the separated ranges are not an automatic continuous 90–264 VAC input rating.
Protection and Recovery
| Item |
Specification / condition |
| Short-circuit protection |
Listed in the datasheet. |
| Overload threshold |
105–150 % of rated output power; Shut down output voltage; re-power on to recover. |
| Overvoltage threshold |
3.8–4.6 V; Shut down output voltage; re-power on to recover. |
| Overtemperature protection |
Shut down output voltage; automatically recovers after temperature goes down. |
The overload percentage is a protection threshold, not a specified timed peak-power rating. Do not size the load as though this percentage were an additional continuous output capability.
Cooling and Control Connections
Forced-air cooling is provided by a built-in DC ball-bearing fan.
An LED indicator shows power-on status.
Remote sensing is provided at CN102: pins 1 and 3 are +S, and pins 2 and 4 are -S.
| Item |
Specification / condition |
| CN102 pin 1 |
+S |
| CN102 pin 2 |
-S |
| CN102 pin 3 |
+S |
| CN102 pin 4 |
-S |
Mating Connectors and Ordering Details
| Item |
Specification / condition |
| Board connector, as printed |
HRS DF11-4DP-2DS or equivalent |
| Mating housing reference, as printed |
HRS DF11-4DS or equivalent |
| Contact reference, as printed |
HRS DF11-**SC or equivalent |
| Connector positions |
4 |
CN102 is identified as HRS DF11-4DP-2DS or equivalent. The listed mating housing is HRS DF11-4DS or equivalent; the contact reference is HRS DF11-**SC. The contact code contains a wildcard, so confirm the exact contact variant and wire suitability before ordering. One four-position housing serves this port; four contacts populate all positions.
The housing/contact quantities above describe the connection needed to populate the port, not an included accessory kit. Inclusion of mating parts is not stated in this datasheet. Use the printed references to confirm exact compatible ordering variants; do not treat a wildcard or abbreviated family reference as a complete contact order code.
Dimensions, Mounting and Wiring
| Item |
Specification / condition |
| Case drawing |
986A |
| Housing dimensions, L × W × H |
225 × 124 × 50 mm |
| Drawing tolerance |
±1 mm |
| Mounting callouts, as printed |
4-M4 L=5mm; 8-M4 (Both Sides) L=6mm |
Housing dimensions are 225 × 124 × 50 mm (L × W × H), with drawing tolerance ±1 mm. The mounting callouts are 4-M4, L=5 mm, and 8-M4 across both sides, L=6 mm. Terminal projection is marked 13 mm max. AC terminals 1/2/3 are L/N/FG; output terminals 4–6 are -V and 7–9 are +V. Select the AC input range using the built-in selector switch before operation.
Case dimensions are separate from terminal projections and the space needed for wiring. Mounting-hole callouts describe the drawing, not supplied screw quantities. Use the full drawing for hole locations and any stated thread-depth limits.
Operating Environment and Derating
| Item |
Specification / condition |
| Working ambient temperature |
-10–60 °C; apply derating curves |
| Working humidity |
20–90 % RH, non-condensing |
| Storage temperature |
-40–85 °C |
| Storage humidity |
10–95 % RH |
| Temperature coefficient |
±0.05%/°C over 0–50 °C |
| Vibration |
10–500 Hz; 2 G; 10 min/cycle; 60 min each along X/Y/Z |
| Item |
Specification / condition |
| Temperature-derating curve, this output |
-10 °C: 100% load; 45 °C: 100% load; 60 °C: 50% load |
| Curve mounting orientation |
Horizontal |
| Item |
Specification / condition |
| Input derating, 90–132 VAC |
90 VAC: 70% load; 105 VAC: 100% load; 132 VAC: 100% load |
| Input derating, 180–264 VAC |
180 VAC: 90% load; 200 VAC: 100% load; 264 VAC: 100% load |
The input-voltage static-characteristics graph is specified at 60 Hz. Values above are the labelled curve points for this model, not a replacement for the complete curves. Apply temperature and input-voltage derating together; consult the original graphs between labelled points. The rightmost plotted input label does not replace the specified operating range.
For operation above 2,000 m, apply the datasheet ambient-temperature derating of 5°C per additional 1,000 m for fan-cooled models.
Keep the illustrated fan-airflow path clear. The catalog temperature-derating curves are specified for horizontal mounting.
The altitude note gives an additional temperature derating above 2,000 m; this datasheet does not state a maximum operating altitude.
Safety, Insulation and Integration Conditions
| Item |
Specification / condition |
| Approvals listed in this datasheet for the model |
UL62368-1; EAC TP TC 004 |
| Design standard reference, not an approval claim |
BS EN/EN62368-1 |
| Withstand voltage |
Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC |
| Isolation resistance |
100 MΩ at 500 VDC; I/P-O/P, I/P-FG, O/P-FG; 25°C / 70% RH |
| MTBF reference, Telcordia SR-332 (Bellcore) |
1557.5 thousand hours minimum |
| MTBF reference, MIL-HDBK-217F |
224.1 thousand hours minimum at 25°C |
The listed approvals and design references reflect this datasheet revision and model scope. They do not certify a complete end product or remove installation and application restrictions.
The datasheet states that this supply does not meet EN 61000-3-2 harmonic-current requirements. It excludes use in end equipment in the European Union connected to public mains rated 220 VAC or higher when the end equipment has average or continuous input power above 75 W, or when the supply forms part of a lighting system. The listed exceptions are professional equipment with total rated input power above 1,000 W, and symmetrically controlled heating elements rated at 200 W or less.
Weight and Packing Reference
| Item |
Specification / condition |
| Catalog packing reference per unit |
1250 g (1.25 kg) |
| Carton reference |
12 units / 16 kg / 1 CUFT |
The per-unit value is the catalog PACKING reference. It is not a measured net mass or an actual shipping-parcel weight; the carton figures are separate packing data.
