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225x124x50mm Enclosed | 3.3V DC Output | 75A Rated Current | Remote Sense | Fan-Cooled | UL Listed | 2-Year Warranty
The SE-450-3.3 is the ultra-low-voltage output model in MEAN WELL's SE-450 series. Delivering 75A at 3.3V DC with 247.5W rated power, this model is purpose-built for legacy industrial equipment, TTL/digital logic systems, FPGA power rails, and automated test equipment requiring a stable 3.3V supply at massive current.
Like all SE-450 models, the SE-450-3.3 uses a switchable 90~132VAC / 180~264VAC input and supports 254~370VDC input. It features built-in DC fan cooling, active inrush current limiting, and the series' remote sense function via CN102 connector - essential for 3.3V applications where even small cable voltage drops can cause logic-level errors.
With 75A continuous at 3.3V, this model serves applications where open-frame supplies are typically required - the SE-450-3.3 provides an enclosed alternative with the safety and durability of a metal chassis. Note that total wattage is limited to 247.5W at this voltage due to secondary-side design constraints.
The SE-450-3.3 is UL62368-1 listed with EAC TP TC 004 certification, backed by a 2-year warranty. Protection requires a power cycle to recover after tripping. Not EN61000-3-2 compliant for certain EU applications.
| Model | SE-450-3.3 |
| DC Output Voltage | 3.3V |
| Rated Current | 75A (0 ~ 75A) |
| Rated Power | 247.5W |
| Ripple & Noise (max) | 200mVp-p |
| Voltage Adjustment Range | 2.97 ~ 3.63V |
| Voltage Accuracy | +/-3.0% |
| Line Regulation | +/-0.5% |
| Load Regulation | +/-2.0% |
| Efficiency (Typ.) | 74% |
| Overvoltage Protection | 3.8 ~ 4.6V (shutdown output; power cycle to recover) |
| Input Voltage Range | 90~132VAC / 180~264VAC (switch-selectable); 254~370VDC |
| Inrush Current Limiting | Active inrush current limiting circuit built-in |
| Frequency Range | 47~63Hz |
| AC Current (Typ.) | 10A / 115VAC | 6A / 230VAC |
| Inrush Current (Typ.) | 35A / 115VAC | 55A / 230VAC (cold start) |
| Leakage Current | < 2.5mA / 240VAC |
| Overload Protection | 105%~150% rated power -> output shutdown; power cycle to recover |
| Short Circuit Protection | Output shutdown, power cycle to recover |
| Over-temperature Protection | Shutdown output, auto-recovery after temperature drops |
| Remote Sense | Via CN102 connector (compensates up to 0.5V line drop per wire) |
| Operating Temperature | -10~+60C (refer to derating curve) |
| Operating Humidity | 20~90% RH, non-condensing |
| Storage Temp / Humidity | -40~+85C, 10~95% RH |
| Vibration Resistance | 10~500Hz, 2G, 10 min/cycle, 60 min each for X, Y, Z axes |
| MTBF | >= 1,557.5K hrs (Telcordia SR-332); >= 224.1K hrs (MIL-HDBK-217F, 25C) |
| Dimensions | 225 x 124 x 50 mm (LxWxH) |
| Net Weight / Packaging | 1.25 kg / 12 pcs per carton / 16 kg / 1.0 CUFT |
| Safety Standards | UL62368-1, EAC TP TC 004 certified; Design refers to: BS EN/EN62368-1 |
| Withstand Voltage | I/P-O/P: 3KVAC | I/P-FG: 2KVAC | O/P-FG: 0.5KVAC |
| Insulation Resistance | I/P-O/P, I/P-FG, O/P-FG: > 100Mohm / 500VDC / 25C / 70% RH |
| EMC Note | Not compliant with BS EN/EN61000-3-2 harmonic current limits for certain EU applications. |
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