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Mean Well

Mean Well MSP-300-12 Power Supply 324W 12V 27A

built-in active PFCmedical safety approvedhigh efficiencyno load power consumption < 0.5~0.8W
SKU MSP-300-12
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Select model — 6 in this family

MSP-300-12
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Overview

MSP-300-12 is the 12V output model of this series: rated current 27A, rated power 324W, typical efficiency 88%.

Features

  • Universal AC input / Full range
  • Built-in active PFC function, PF>0.95
  • High efficiency up to 89%
  • Withstand 300VAC surge input for 5 seconds
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Built-in constant current limiting circuit
  • 1U low profile 41mm
  • Medical safety approved (MOOP level)
  • Built-in cooling fan ON-OFF control
  • Built-in DC OK signal
  • Built-in remote ON-OFF control
  • Standby 5V@0.3A
  • Built-in remote sense function
  • No load power consumption<0.5W (Note.6)
  • 5 years warranty

Specifications

MSP-300-12Specifications from the official datasheet (2026-02-09 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
27A
CURRENT RANGE
0 ~ 27A
RATED POWER
324W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE ADJ. RANGE
10.2 ~ 13.8V
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.3%
LOAD REGULATION
±0.5%
SETUP, RISE TIME
1000ms, 50ms/230VAC 2500ms, 50ms/115VAC at full load
HOLD UP TIME (Typ.)
16ms/230VAC 16ms/115VAC at full load

INPUT

VOLTAGE RANGENote.5
85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE
47 ~ 63Hz
POWER FACTOR (Typ.)
PF>0.95/230VAC PF>0.99/115VAC at full load
EFFICIENCY (Typ.)
88%
AC CURRENT (Typ.)
4.5A/115VAC 2.25A/230VAC
INRUSH CURRENT (Typ.)
35A/115VAC 70A/230VAC
LEAKAGE CURRENT
Earth leakage current < 450μA/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
14.4 ~ 16.8V 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 turns on : 3.3 ~ 5.6V ; PSU turns off : 0 ~ 1V
REMOTE CONTROL
RC+ / RC-: 4 ~ 10V or open = power on ; 0 ~ 0.8V or short = power off
FAN CONTROL (Typ.)
Load 35±15% 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
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note 4)

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
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/ EN55035, BS EN/ EN60601-1-2 , EAC TP TC 020

OTHERS

MTBF
1337.5K hrs min. Telcordia SR-332 (Bellcore) ; 175.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
199*105*41mm (L*W*H)
PACKING
0.95Kg;15pcs/15.3Kg/0.83CUFT
Test conditions and notes7
  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 0.1μF & 47μF parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. 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 )
  5. 5. Derating may be needed under low input voltages. Please check the derating curve for more details.
  6. 6. No load power consumption<0.5W when RC- & RC+ (CN100 pin4,6) 0 ~ 8V or short.
  7. 7. 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-300-12 Mechanical Specification
Mechanical Specification
MSP-300-12 Block Diagram
Block Diagram
MSP-300-12 Derating Curve
Derating Curve
MSP-300-12 M S P - 3 0 0 series
M S P - 3 0 0 series
MSP-300-12 2.DC-OK Signal
2.DC-OK Signal
MSP-300-12 3.Remote Control
3.Remote Control

Downloads

FAQ

Can I use the MSP-300-12 for a 12V industrial control panel or automation system?

Yes, if the equipment requires constant 12V DC and the combined load stays within 27A and 324W. The 85-264VAC input also makes it practical for standardized panel builds used across different AC supply regions.

Is the MSP-300-12 suitable for 12V CCTV, access control, or security hardware?

It can be a fit for larger 12V security loads that need a constant voltage source, as long as total demand does not exceed 27A and 324W. The output can also be fine-tuned between 10.2V and 13.8V to offset cable losses.

Can this model power a 12V embedded computing or communications rack load?

It is suitable for 12V DC equipment that expects a regulated constant voltage input. Output capacity is 12V at up to 27A, with total power up to 324W.

Is the MSP-300-12 suitable for outdoor or temperature-challenging locations?

The operating temperature range is -40°C to +70°C, with output derating required per the datasheet's derating curve, which supports use in demanding thermal environments. No IP rating is listed in the provided specs, so outdoor exposure or wet-area suitability is not confirmed by this data alone.

How does the MSP-300-12 compare with the other MSP-300 versions?

The MSP-300 group includes 198W at 3.3V and 60A, 300W at 5V and 60A, 300W at 7.5V and 40A, 324W at 12V and 27A, 330W at 15V and 22A, 336W at 24V and 14A, 324W at 36V and 9A, and 336W at 48V and 7A. The MSP-300-12 is the 12V member of that range, with 324W total output and 27A available current.

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Mean Well MSP-300-12 Power Supply 324W 12V 27A
Mean Well

Mean Well MSP-300-12 Power Supply 324W 12V 27A

Log in to see price

MSP-300-12 is the 12V output model of this series: rated current 27A, rated power 324W, typical efficiency 88%.

Features

  • Universal AC input / Full range
  • Built-in active PFC function, PF>0.95
  • High efficiency up to 89%
  • Withstand 300VAC surge input for 5 seconds
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Built-in constant current limiting circuit
  • 1U low profile 41mm
  • Medical safety approved (MOOP level)
  • Built-in cooling fan ON-OFF control
  • Built-in DC OK signal
  • Built-in remote ON-OFF control
  • Standby 5V@0.3A
  • Built-in remote sense function
  • No load power consumption<0.5W (Note.6)
  • 5 years warranty

Model

  • 100W 12V
  • 1000W 12V
  • 200W 12V
  • 300W 12V
  • 450W 12V
  • 600W 12V
View product

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