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Mean Well

Mean Well HEP-185-48A Power Supply 187.2W 48V 3.9A

fanless designhigh efficiency up to 96%rugged metal case with IP65 design(IP68 option available)withstand 10G vibrationsuitable for harsh environment
SKU HEP-185-48A
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Select model — 15 in this family

HEP-185-48A
Available to order
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Overview

HEP-185-48A is the 48V output model of this series: rated current 3.9A, rated power 187.2W, typical efficiency 94%.

HEP-185 is a 185W industrial AC/DC power supply featuring the outstanding capability to operate under highly humid, dusty, oily, and high-vibration harsh environment. The entire series is housed with the aluminum case and fully potted with heat-conducted silicone. Thanks to state-of-the-art design, the working efficiency is up to 94%, enabling HEP-185 perfectly work between -55℃ and +70℃ under free air convection.

Features

  • Universal AC input / Full range
  • Built-in active PFC function
  • High efficiency up to 94%
  • Fanless design, cooling by free air convection
  • -55~+70℃ wide operating range
  • Aluminum case and filling with heat-conducted silicone
  • IP65 design, optional IP68 rated model available
  • Meet 6KV surge immunity level
  • Withstand 10G vibration test
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Operating altitude up to 5000 meters (Note.9)
  • 6 years warranty

Specifications

HEP-185-48ASpecifications from the official datasheet (2025-10-10 edition)

OUTPUT

DC VOLTAGE
48V
RATED CURRENT
3.9A
RATED POWER
187.2W
RIPPLE & NOISE (max.)Note.2
200mVp-p
VOLTAGE ADJ. RANGENote.5
43 ~ 53V
CURRENT ADJ. RANGE
1.95 ~ 3.9A
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.5%
LOAD REGULATION
±0.5%
SETUP, RISE TIMENote.7
1000ms,50ms/115VAC 500ms,50ms/230VAC at full load
HOLD UP TIME (Typ.)
16ms at full load 230VAC /115VAC

INPUT

VOLTAGE RANGENote.4
90~264VAC (277VAC operational) 128~370VDC(390VDC operational)
FREQUENCY RANGE
47 ~ 63Hz
POWER FACTOR (Typ.)
PF>0.98/115VAC, PF>0.95/230VAC, PF>0.92/277VAC at full load
EFFICIENCY (Typ.)
94%
AC CURRENT (Typ.) 12V
1.8A / 115VAC 0.8A / 230VAC 0.7A / 277VAC
AC CURRENT (Typ.) 15V ~ 54V
2.1A / 115VAC 1A / 230VAC 0.8A / 277VAC
INRUSH CURRENT(Typ.)
COLD START 65A at 230VAC
LEAKAGE CURRENT
<0.75mA / 277VAC

PROTECTION

OVERLOAD
105 ~ 125% Protection type : Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT
Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE
54 ~ 63V
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-55 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY
-60 ~ +80℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 60℃)
VIBRATION
20 ~ 500Hz, 10G 12min./1cycle, period for 72min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDSNote.6,9
UL62368-1, IEC62368-1, IP65 (or IP68 for HEP-185 Blank type), EAC TP TC 004 approved ; Design refer to BS EN/EN62368-1
WITHSTAND VOLTAGE
I/P-O/P:3.75KVAC I/P-FG:2KVAC O/P-FG:1.5KVAC
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 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, light industry level (surge 6KV), EAC TP TC 020

OTHERS

MTBF
1967.4K hrs min. Telcordia SR-332(Bellcore) ; 164.2K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
228*68*38.8mm (L*W*H)
PACKING
1.15Kg; 12pcs/14.8Kg/0.8CUFT

Certifications & ratings

IP level
IP65 IP68 (Optional)
Test conditions and notes10
  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. Derating may be needed under low input voltages. Please check the static characteristics for more details.
  5. 5. A type only.
  6. 6. Safety and EMC design refer to BS EN/EN60598-1, CNS15233, GB7000.1, FCC part18.
  7. 7. Length of set up time is measured at cold first start. Turning ON/OFF the power supply may lead to increase of the set up time.
  8. 8. The power supply is considered as a component that will be operated in combination with final equipment. Since EMC performance will be affected by the complete installation, the final equipment manufacturers must re-qualify EMC Directive on the complete installation again. (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
  9. 9. The water protection level test for the IP68 rating is performed 1000mm below the surface of the water for 1 month.
  10. 10. 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

HEP-185-48A Block Diagram
Block Diagram
HEP-185-48A Mechanical Specification
Mechanical Specification

Typical applications

  • Outdoor telecommunication equipment
  • Outdoor electronic signage and billboard
  • Petroleum plant or mine shaft facility

Downloads

FAQ

Can I use the HEP-185-48A for a 48V industrial control or automation system?

Yes, this model is a constant-voltage 48V supply rated for 187.2W and 3.9A, which fits 48V DC industrial and automation equipment that needs that output class. Its wide 90-264VAC input (277VAC operational) and IP65 rating also make it practical for installations where AC supply conditions vary and low-maintenance operation matters.

Is the HEP-185-48A suitable for 48V embedded or edge-computing equipment?

It can be a fit for embedded or edge systems designed for a 48V constant-voltage source, as long as the total load stays within 187.2W and 3.9A. The 94% typical efficiency and IP65 rating are useful where dust intake or thermal management are concerns.

Can this power supply be used for 48V networking or telecom-style DC loads?

It is appropriate for 48V DC loads that require a constant-voltage supply and draw no more than 3.9A or 187.2W. Buyers commonly look for 48V models for communications and network-adjacent equipment, and this unit matches that voltage class with UL62368-1 and IEC62368-1 safety approval (design refers to BS EN/EN62368-1) and EAC approval.

Is the HEP-185-48A okay for outdoor or harsh industrial environments?

This version is rated IP65 and has an operating range of -55°C to +70°C (subject to the derating curve), so it is built for demanding indoor or outdoor environments where water resistance and wide temperature tolerance are needed. Its 10G vibration resistance also supports use in harsher industrial conditions.

How does the HEP-185-48A compare with other 48V models in the HEP series?

On this sheet, the 48V models are the HEP-185-48A (IP65) and the HEP-185-48 (IP68), both rated 187.2W at 3.9A. The other HEP-185 outputs are 156W at 12V, 172W at 15V, 187.2W at 24V and 36V, and 186.3W at 54V. Ratings of other HEP power classes are listed on their own datasheets.

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Mean Well HEP-185-48A Power Supply 187.2W 48V
Mean Well

Mean Well HEP-185-48A Power Supply 187.2W 48V 3.9A

Log in to see price

HEP-185-48A is the 48V output model of this series: rated current 3.9A, rated power 187.2W, typical efficiency 94%.

HEP-185 is a 185W industrial AC/DC power supply featuring the outstanding capability to operate under highly humid, dusty, oily, and high-vibration harsh environment. The entire series is housed with the aluminum case and fully potted with heat-conducted silicone. Thanks to state-of-the-art design, the working efficiency is up to 94%, enabling HEP-185 perfectly work between -55℃ and +70℃ under free air convection.

Features

  • Universal AC input / Full range
  • Built-in active PFC function
  • High efficiency up to 94%
  • Fanless design, cooling by free air convection
  • -55~+70℃ wide operating range
  • Aluminum case and filling with heat-conducted silicone
  • IP65 design, optional IP68 rated model available
  • Meet 6KV surge immunity level
  • Withstand 10G vibration test
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Operating altitude up to 5000 meters (Note.9)
  • 6 years warranty

Typical applications

  • Outdoor telecommunication equipment
  • Outdoor electronic signage and billboard
  • Petroleum plant or mine shaft facility

Model

  • 100W 48V
  • 100W 48V Adjustable
  • 1000W 48V
  • 150W 48V
  • 150W 48V Adjustable
  • 185W 48V
  • 185W 48V Adjustable
  • 240W 48V
  • 240W 48V Adjustable
  • 320W 48V
  • 320W 48V Adjustable
  • 480W 48V
  • 480W 48V Adjustable
  • 600W 48V
  • 600W 48V Adjustable
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