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Mean Well

Mean Well SE-450-3.3 Power Supply 247.5W 3.3V 75A

economical model medium to high power(450W~1500W)
SKU SE-450-3.3
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Overview

SE-450-3.3 is the 3.3V output model of this series: rated current 75A, rated power 247.5W, typical efficiency 74%.

Features

  • AC input active surge current limiting
  • AC input range selected by switch
  • Protections: Short circuit /Overload / Over voltage / Over temperature
  • Forced air cooling by built-in DC ball bearing fan
  • Built-in remote sense function
  • LED indicator for power on
  • UL approved
  • 2 years warranty

Specifications

SE-450-3.3Specifications from the official datasheet (2024-09-30 edition)

OUTPUT

DC VOLTAGE
3.3V
RATED CURRENT
75A
CURRENT RANGE
0 ~ 75A
RATED POWER
247.5W
RIPPLE & NOISE (max.)Note.2
200mVp-p
VOLTAGE ADJ. RANGE
2.97 ~ 3.63V
VOLTAGE TOLERANCENote.3
±3.0%
LINE REGULATION
±0.5%
LOAD REGULATION
±2.0%
SETUP, RISE TIME
1500ms, 50ms/230VAC 1500ms, 50ms/115VAC at full load
HOLD UP TIME (Typ.)
16ms/230VAC 12ms/115VAC at full load

INPUT

VOLTAGE RANGE
90 ~ 132VAC / 180 ~ 264VAC selected by SW 254 ~ 370VDC
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
74%
AC CURRENT (Typ.)
10A/115VAC 6A/230VAC
INRUSH CURRENT (Typ.)
35A/115VAC 55A/230VAC
LEAKAGE CURRENT
<2.5mA / 240VAC

PROTECTION

OVERLOAD
105 ~ 150% rated output power Protection type : Shut down o/p voltage, re-power on to recovery
OVER VOLTAGE
3.8 ~ 4.6V Protection type : Shut down o/p voltage, re-power on to recovery
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-10 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃,10 ~ 95% RH
TEMP. COEFFICIENT
±0.05%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY

SAFETY STANDARDS
UL62368-1, EAC TP TC 004 approved; Design refer to BS EN/EN62368-1
WITHSTAND VOLTAGE
I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH

OTHERS

MTBF
1557.5 K hrs min. Telcordia SR-332 (Bellcore) ; 224.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
225*124*50mm (L*W*H)
PACKING
1.25Kg;12PCS/16Kg/1CUFT
Test conditions and notes5
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
  5. 5. This power supply does not meet the harmonic current requirements outlined by BS EN/EN61000-3-2. Please do not use this power supply under the following conditions: a) the end-devices is used within the European Union, and b) the end-devices is connected to public mains supply with 220Vac or greater rated nominal voltage, and c) the power supply is: - installed in end-devices with average or continuous input power greater than 75W, or - belong to part of a lighting system Exception: Power supplies used within the following end-devices do not need to fulfill BS EN/EN61000-3-2 a) professional equipment with a total rated input power greater than 1000W; b) symmetrically controlled heating elements with a rated power less than or equal to 200W

Technical drawings

SE-450-3.3 Mechanical Specification
Mechanical Specification
SE-450-3.3 Block Diagram
Block Diagram
SE-450-3.3 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the SE-450-3.3 for a high-current 3.3V embedded system or processor board rack?

Yes, this model provides constant voltage 3.3V output at up to 75A, with a total power rating of 247.5W. It is suited to high-current 3.3V embedded electronics or board-level systems that are designed around a 3.3V rail.

Is the SE-450-3.3 appropriate for 3.3V industrial logic or control electronics?

It can be appropriate when the electronics require a fixed 3.3V DC supply and the load remains within 75A and 247.5W. Its constant voltage operation is intended for equipment expecting regulated 3.3V input.

Can the SE-450-3.3 support a centralized 3.3V bus in a lab or manufacturing test fixture?

Yes, if the fixture distributes 3.3V DC and the combined demand stays under 75A and 247.5W. Its 90-132VAC / 180-264VAC input, selected by a switch, also helps when the fixture may be used in different facility power environments.

Is the SE-450-3.3 meant for exposed outdoor use?

The specs show an operating temperature range of -10°C to +60°C, but they do not provide an IP rating. Because no IP protection level is listed, it should normally be used indoors or inside a protective enclosure.

How does the SE-450-3.3 differ from the other SE-450 outputs?

The listed SE-450 outputs are 3.3V 75A 247.5W, 5V 75A 375W, 12V 37.5A 450W, 15V 30A 450W, 24V 18.8A 451.2W, 36V 12.5A 450W, and 48V 9.4A 451.2W. The SE-450-3.3 is the lowest-voltage version and also carries the lowest listed power rating at 247.5W.

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Mean Well SE-450-3.3 Power Supply 247.5W 3.3V 75A
Mean Well

Mean Well SE-450-3.3 Power Supply 247.5W 3.3V 75A

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SE-450-3.3 is the 3.3V output model of this series: rated current 75A, rated power 247.5W, typical efficiency 74%.

Features

  • AC input active surge current limiting
  • AC input range selected by switch
  • Protections: Short circuit /Overload / Over voltage / Over temperature
  • Forced air cooling by built-in DC ball bearing fan
  • Built-in remote sense function
  • LED indicator for power on
  • UL approved
  • 2 years warranty
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