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Mean Well ERPF-400-48 Switching Power Supply 400W 48V 8.3A

high efficiency up to 91%design against rain splashlow cost and high reliability

SKU ERPF-400-48

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Overview

ERPF-400-48 is the 48V output model of this series: rated current 8.3A, rated power 398.4W, typical efficiency 91%.

ERPF-400 series is a 400W single output enclosed type AC/DC power supply with the active PFC design. It adopts a aluminum case and the interior is semi-potted, protecting the internal electronic components from rain splash and dust. With the complete protection functions, ERPF-400 is suitable for the applications such as outdoor LED channel letters, commercial display, etc.

Features

Universal AC input / Full range (Withstand 300VAC surge input for 5 seconds)
Built-in active PFC function
High efficiency up to 91%
Design against rain splash
Protections: Short circuit / Overload / Over voltage/ Over temperature
Cooling by free air convection
LED indicator for power on
Low cost, high reliability
100% full load burn-in test
3 years warranty

Specifications

ERPF-400-48Specifications from the official datasheet (2025-12-12 edition)

OUTPUT

DC VOLTAGE: 48V
RATED CURRENT: 8.3A
CURRENT RANGE^Note.5: 0 ~ 8.3A
RATED POWER: 398.4W
RIPPLE & NOISE (max.)^Note.2: 240mVp-p
VOLTAGE ADJ. RANGE: 43.2 ~ 52.8V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME: 2000ms, 100ms/230VAC; 3000ms, 100ms/115VAC at full load
HOLD UP TIME (Typ.): 10ms/230VAC; 10ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 90 ~ 264VAC 127 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF≧0.95/230VAC, PF≧0.98/115VAC
EFFICIENCY (Typ.): 91%
AC CURRENT (Typ.): 2.5A/230VAC 3A/115VAC
INRUSH CURRENT (Typ.): cold start 45A/115VAC, 90A/230VAC
LEAKAGE CURRENT: <1mA / 240VAC

PROTECTION

OVER LOAD: 105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT: Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 55.2 ~ 64.8V 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

ENVIRONMENT

WORKING TEMP.: -30 ~ +60℃ (Refer to output load derating curve)
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -30 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.1%/℃ (0 ~ 35℃ )
VIBRATION: 10 ~ 500Hz, 3G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.6)

SAFETY STANDARDS: UL60950-1,IEC/BS EN/EN62368-1, GB 4943.1, EAC TP TC 004, IS13252(Part1)(for 12,24 only) 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, O/P-FG:100M Ohms/500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032 (CISPR32) class A, GB17625.1,GB/T 9254.1; BS EN/EN61000-3-2; BS EN/EN61000-3-3, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035; light industry level, EAC TP TC 020

OTHERS

MTBF: 1981.2K hrs min. Telcordia SR-332 (Bellcore) 233.4Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 220.4*130*48mm (L*W*H)
PACKING: 1.1Kg; 9pcs / 11Kg / 0.63CUFT

Test conditions and notes6

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 0.1uf & 47uf 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 static characteristics for more details.
5. Please refer to “Static Characteristics".
6. 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 450mm*450mm 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)

Technical drawings

ERPF-400-48 Mechanical Specification — Mechanical Specification

ERPF-400-48 Block Diagram — Block Diagram

ERPF-400-48 Derating Curve — Derating Curve

Typical applications

LED decoration/signage
LED channel letters
LED display

Downloads

Catalogues2

Mean Well Catalog (Industrial) PDF Download

Mean Well Inverter Catalog PDF Download

FAQ

What is the output rating of the Mean Well ERPF-400-48?

The ERPF-400-48 is rated for 48V DC output with a rated current of 8.3A. Its power rating is 398.4W, so it is typically marketed as a 400W power supply.

What input voltage range does the ERPF-400-48 support?

This model accepts a universal AC input range of 90 to 264VAC at 47 to 63Hz and also supports 127 to 370VDC input. Derating may be needed under low input voltages, as shown in the static characteristics.

Is the ERPF-400-48 suitable for security and enclosed power supply applications?

Yes, this model is positioned for enclosed AC-DC and security-related power supply applications. Its 48V output, built-in protections, and high-power enclosed design make it suitable for commercial and industrial use where a regulated 48V supply is needed.

How does the ERPF-400-48 perform in demanding temperature environments?

The ERPF-400-48 has an operating temperature range of -30°C to +60°C, subject to the output load derating curve. It also includes over-temperature protection that shuts down output voltage and recovers automatically after the temperature drops.

What protection features are included in the ERPF-400-48?

This power supply includes short circuit, overload, over-voltage, and over-temperature protection. Short circuit and overload protection use constant current limiting with automatic recovery, while over-voltage protection shuts down the output and requires re-powering to recover.

What are the efficiency and cooling characteristics of this model?

The ERPF-400-48 offers a typical efficiency of 91%, which helps reduce wasted energy in continuous-duty operation. It operates from -30°C to +60°C, with output load derating at higher ambient temperatures per the derating curve.

What certifications does the ERPF-400-48 have?

The ERPF-400-48 is approved to standards including UL60950-1, IEC/BS EN/EN62368-1, GB 4943.1, and EAC TP TC 004. Its EMC emission complies with BS EN/EN55032 (CISPR32) class A.

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Model	Power	Voltage	Current
Mean Well ERPF-400-24 Switching Power Supply 400W 24V 16.7A	400.8W	24V	16.7A	View
Mean Well ERPF-400-12 Switching Power Supply 400W 12V 30A	360W	12V	30A	View

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