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Mean Well MSP-450-3.3 Power Supply 297W 3.3V 90A

Name: Mean Well MSP-450-3.3 Power Supply 297W 3.3V 90A
Brand: Mean Well
SKU: MSP-450-3.3
Price: 189.87 USD
Availability: InStock

built-in active PFCmedical safety approvedhigh efficiencyno load power consumption < 0.5~0.8W

SKU MSP-450-3.3

$189.87 USD

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Select model — 5 in this family

MSP-450-3.3

MSP-100-3.3 100W 3.3V Backorder$62.05 USD

MSP-200-3.3 200W 3.3V Low stock$100.89 USD

MSP-300-3.3 300W 3.3V Low stock$138.77 USD

MSP-450-3.3 450W 3.3V Low stock$189.87 USD

MSP-600-3.3 600W 3.3V Backorder$211.91 USD

Product variants

In stock

Overview

MSP-450-3.3 is the 3.3V output model of this series: rated current 90A, rated power 297W, typical efficiency 80%.

Features

Universal AC input / Full range
Built-in active PFC function, PF>0.95
High efficiency up to 89.5%
Withstand 300VAC surge input for 5 seconds
Protections: Short circuit / Overload / Over voltage / Over temperature
Built-in constant current limiting circuit
Medical safety approved (MOOP level)
Built-in cooling Fan ON-OFF control
Built-in DC OK signal
Built-in remote ON-OFF control
Stand by 5V@0.3A
Built-in remote sense function
No load power consumption<0.6W (Note.6)
5 years warranty

Specifications

MSP-450-3.3Specifications from the official datasheet (2025-12-05 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 90A
CURRENT RANGE: 0 ~ 90A
RATED POWER: 297W
RIPPLE & NOISE (max.)^Note.2: 80mVp-p
VOLTAGE ADJ. RANGE: 2.8 ~ 3.8V
VOLTAGE TOLERANCE^Note.3: ±2.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 1000ms, 100ms/230VAC 2500ms, 100ms/115VAC at full load
HOLD UP TIME (Typ.): 16ms/230VAC 16ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF>0.95/230VAC PF>0.99/115VAC at full load
EFFICIENCY (Typ.): 80%
AC CURRENT (Typ.): 5A/115VAC 2.4A/230VAC
INRUSH CURRENT (Typ.): 35A/115VAC 70A/230VAC
LEAKAGE CURRENT: Earth leakage current < 300μA/264VAC , Touch leakage current < 100μA/264VAC

PROTECTION

OVERLOAD: 105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 3.96 ~ 4.62V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, recovers automatically after temperature goes down

FUNCTION

5V STANDBY: 5VSB : 5V@0.3A ; tolerance±5%, ripple : 50mVp-p(max.)
DC OK SIGNAL: PSU turn on : 3.3 ~ 5.6V ; PSU turn off : 0 ~ 1V
REMOTE CONTROL: RC+ / RC-: 4 ~ 10V or open = power on ; 0 ~ 0.8V or short = power off
FAN CONTROL (Typ.): Load 20±10% or RTH2≧50℃ Fan on

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS: IEC 60601-1:2005+A1+A2, ANSI/AAMI ES60601-1:2005+A2, CAN/CSA C22.2 No. 60601-1:2014+A2 EAC TP TC 004 approved;Design refer to BS EN/EN60335-1, BS EN/EN 62368-1(by request)
ISOLATION LEVEL: Primary-Secondary: 2×MOOP, Primary-Earth: 1×MOOP, Secondary-Earth: 1×MOOP
WITHSTAND VOLTAGE: I/P-O/P:4KVAC 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
EMC EMISSION: Compliance to BS EN/EN55011 (CISPR11) Class B, BS EN/ EN61000-3-2,-3, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/ EN61000-4-2,3,4,5,6,8,11, BS EN/ EN60601-1-2 , EAC TP TC 020

OTHERS

MTBF: 159.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 218*105*41mm (L*W*H)
PACKING: 1.19Kg; 12pcs/15.3Kg/0.81CUFT

Test conditions and notes9

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Derating may be needed under low input voltages. Please check the derating curve for more details.
5. Length of set up time is measured at first cold start. Turning ON/OFF the power supply may lead to increase of the set up time.
6. No load power consumption<0.5W when RC- & RC+ (CN100 pin1,2) 0 ~ 0.8V or short.
7. When the input voltage is less than 40VAC, the SPS may exhibit degradation of performance. The final product manufacturers must re-confirm this deviation that does not affect basic safety or essential performance.
8. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
9. 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).

Technical drawings

MSP-450-3.3 Mechanical Specification — Mechanical Specification

MSP-450-3.3 Block Diagram — Block Diagram

MSP-450-3.3 Derating Curve — Derating Curve

MSP-450-3.3 Function Manual — Function Manual

Downloads

Datasheet1

MSP-450-3.3 datasheetMSP-450-SPEC.PDF · 2025-12-05 edition PDF Download

Certificates3

UL Certificate(MSP-450)(EN) PDF Download

CB Certificate(MSP-450)(EN) PDF Download

EMC Certificate(MSP-450)(EN) PDF Download

Test reports1

Test Report(MSP-450-3.3)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the MSP-450-3.3 for a high-current 3.3V industrial control backplane?

Yes, this model is a constant voltage power supply rated for 3.3V output with up to 90A and 297W. That makes it suitable for 3.3V industrial control electronics that need very high current on a single DC rail.

Is the MSP-450-3.3 a fit for powering 3.3V embedded processors or FPGA systems in test equipment?

It can be a fit where the equipment is designed for a 3.3V constant voltage source and needs substantial current headroom, since the unit provides 3.3V at up to 90A. The wide 85-264VAC input also suits facilities that may have different AC supply standards.

Can this 3.3V power supply be used for low-voltage automation electronics with heavy current demand?

Yes, the MSP-450-3.3 is intended for constant voltage output at 3.3V and can deliver up to 297W. That profile fits low-voltage automation electronics, controller assemblies, or embedded platforms that run on 3.3V and draw high current.

Would the MSP-450-3.3 work for a rack-based electronics bench or burn-in fixture?

It is suited to bench or rack environments where a regulated 3.3V rail is required, especially when loads can approach 90A. Its compact 218.0 × 105.0 × 41.0 mm form factor and 1.19 kg weight can help in dense equipment layouts.

Is the MSP-450-3.3 suitable for outdoor or harsh-environment use?

The provided specs show an operating temperature range of -40°C to +70°C, with output derating at higher ambient temperatures per the derating curve. No IP rating is listed, so the specs do not identify it as an outdoor or washdown power supply.

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Mean Well MSP-450-3.3 Power Supply 297W 3.3V 90A

Select model — 5 in this family

Overview

Features

Specifications

OUTPUT

INPUT

PROTECTION

FUNCTION

ENVIRONMENT

SAFETY & EMC

OTHERS

Technical drawings

Downloads

Datasheet1

Certificates3

Test reports1

Catalogues1

FAQ

Payment & Security

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Mean Well MSP-450-3.3 Power Supply 297W 3.3V 90A

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