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Mean Well EPP-400-12 Power Supply 250W 12V 20.8A

Name: Mean Well EPP-400-12 Power Supply 250W 12V 20.8A
Brand: Mean Well
SKU: EPP-400-12
Price: 86.96 USD
Availability: InStock

5" x 3"high efficiency up to 93%economical PFCno load power consumption<0.5W

SKU EPP-400-12

$86.96 USD

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In stock

Overview

EPP-400-12 is the 12V output model of this series: typical efficiency 91.5%.

EPP-400 is a 400W highly reliable green PCB type power supply with a high power density on the 5" by 3" footprint. It accepts 80~264VAC input and offers various output voltages between 12V and 48V. The working efficiency is up to 94% and the extremely low no load power consumption is down below 0.5W. EPP-400 is able to be used for both ClassⅠ(with FG) and Class Ⅱ(no FG) system design. EPP-400 is equipped with complete protection functions; it is complied with the international safety regulations such as TUV BS EN/EN62368-1, TUV BS EN/EN60335-1, UL62368-1 and IEC62368-1. EPP-400 series serves as a high price-performance power supply solution for various industrial applications.

Features

5"×3" miniature size
Universal AC input / Full range
Built-in active PFC function
EMI Class B for ClassⅠ& Class A for Class Ⅱ configuration
No load power consumption<0.5W by PS-ON control
High efficiency up to 94%
Protections: Short circuit / Overload / Over voltage / Over temperature
Cooling by free air convection for 250W and 400W with 25CFM forced air
Built-in 12V/0.5A FAN supply
Standby 5V@1A with fan , 0.6A without fan
Built-in remote sense function
LED indicator for power on
Output 18V available
Operating altitude up to 5000 meters
3 years warranty

Specifications

EPP-400-12Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 12V
CURRENT 25CFM: 33.3A
CURRENT Convection: 20.8A
RATED POWER 25CFM: 399.6W
RATED POWER Convection: 249.6W
RIPPLE & NOISE (max.)^Note.2: 120mVp-p
VOLTAGE ADJ. RANGE (MAIN OUTPUT): 11.4~12.6V
VOLTAGE TOLERANCE^Note.3: ±3.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 1000ms, 30ms/230VAC 1500ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.): 16ms/230VAC 12ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 80 ~ 264VAC 113 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR: PF>0.94/230VAC PF>0.98/115VAC at full load
EFFICIENCY (Typ.): 91.5%
AC CURRENT (Typ.): 4.2A/115VAC 2.1A/230VAC
INRUSH CURRENT (Typ.): COLD START 40A/115VAC 80A/230VAC
LEAKAGE CURRENT: <0.75mA / 240VAC

PROTECTION

OVERLOAD: 105 ~ 135% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 13.2 ~ 15.6V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Protection type : Shut down o/p voltage, recovers automatically after temperature goes down

FUNCTION

5V STANDBY: 5VSB : 5V@0.6A without fan, 1A with fan 25CFM ; tolerance ±2%, ripple : 120mVp-p(max.)
FAN SUPPLY: 12V@0.5A for driving a fan ; tolerance -15% ~+10% at main output 35% rated current (25CFM)
PS-ON INPUT SIGNAL: Power on: PS-ON = "Hi" or " > 2 ~ 5V" ; Power off: PS-ON = "Low" or " < 0 ~ 0.5V"
POWER GOOD / POWER FAIL: 500ms>PG>10ms ; The TTL signal goes high with 10ms to 500ms delay after power set up ; The TTL signal goes low at least 1ms before Vo below 90% of rated value

ENVIRONMENT

WORKING TEMP.: -30 ~ +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℃)
OPERATING ALTITUDE^Note.7: 5000 meters
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS: UL62368-1, TUV BS EN/EN62368-1,BS EN/EN60335-1, IEC62368-1, CCC GB4943.1, EAC TP TC 004 approved
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:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032 (CISPR32) Class B, BS EN/EN61000-3-2,-3,CCC GB17625.1, GB/T9254, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035, BS EN/EN61000-6-2, heavy industry level, EAC TP TC 020

OTHERS

MTBF: 1395.2K hrs min. Telcordia SR-332 (Bellcore) ; 194.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 127*76.2*35mm (L*W*H)
PACKING: 0.39Kg; 36pcs/15Kg/0.96CUFT

Test conditions and notes7

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. Touch current was measured from primary input to DC output.
6. The power supply is considered a component which will be installed into a final equipment. All the ClassⅠ(with FG) EMC test are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The ClassⅡ (without FG) EMC test is been executed by mounting the unit on a 130mm*86.6mm metal plate with 1mm of thickness. 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 )
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

EPP-400-12 E P P - 4 0 0 series — E P P - 4 0 0 series

EPP-400-12 Derating Curve — Derating Curve

EPP-400-12 E P P - 4 0 0 series (2) — E P P - 4 0 0 series (2)

Typical applications

Industrial automation machinery
Industrial control system
Mechanical and electrical equipment
Electronic instruments, equipments or apparatus

Downloads

Datasheet1

EPP-400-12 datasheetEPP-400-SPEC.PDF · 2026-03-31 edition PDF Download

Certificates11

Mean Well E183223 UL Certificate PDF Download

Mean Well 0147476-EAC Certificate PDF Download

Mean Well EPP-400-500-TUV(62368) Certificate PDF Download

Mean Well EPP-400-500-TUV(60335) Certificate PDF Download

Mean Well EPP-400-CCC Certificate PDF Download

Mean Well EPP-400-500-CB Certificate PDF Download

Mean Well EPP-400-500-CB(UL) Certificate PDF Download

Mean Well EPP-400-CB(TUV) Certificate PDF Download

Mean Well EPP-400-EMC Certificate PDF Download

Mean Well EPP-400-CE-dec Certificate PDF Download

Mean Well EPP-400-UK-dec Certificate PDF Download

Test reports1

Mean Well EPP-400-12 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the EPP-400-12 for a 12V PLC, HMI, or control-panel power bus?

Yes, for 12V constant-voltage control equipment with a combined load up to 20.8A and 249.6W with convection cooling, or 33.3A and 399.6W with 25CFM forced airflow. That makes it suitable for higher-current 12V panel applications where multiple devices share one DC supply.

Is the EPP-400-12 suitable for 12V embedded computers or industrial electronics?

It can be a fit for embedded or industrial electronics that require regulated 12V DC and stay within 20.8A with convection cooling (33.3A with 25CFM airflow). The available 249.6W, or 399.6W with forced air, gives headroom for higher-power 12V loads.

Can this model power several 12V automation accessories from one supply?

Yes, provided the accessories are 12V constant-voltage loads and their total demand does not exceed 20.8A or 249.6W with convection cooling (33.3A or 399.6W with 25CFM airflow). This is useful when a single 12V source is needed for multiple industrial or automation devices.

Is the EPP-400-12 appropriate for 12V test benches or production fixtures?

It can be used where a fixture or bench setup needs a constant 12V output with up to 20.8A available with convection cooling (33.3A with 25CFM airflow). The 80-264VAC input range also supports facilities with different AC mains conditions.

Can the EPP-400-12 be used in outdoor or temperature-variable environments?

Its specified operating range is -30°C to +70°C, with output derating at higher ambient temperatures per the derating curve. No IP rating is listed in these specs, so weather-exposed outdoor use should not be assumed without additional enclosure protection.

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