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Mean Well

Mean Well HEP-185-54 Power Supply 186.3W 54V 3.45A

fanless designhigh efficiency up to 96%rugged metal case with IP65 design(IP68 option available)withstand 10G vibrationsuitable for harsh environment
SKU HEP-185-54
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Select model — 14 in this family

HEP-185-54
Available to order
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Overview

HEP-185-54 is the 54V output model of this series: rated current 3.45A, rated power 186.3W, 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-185-54Specifications from the official datasheet (2025-10-10 edition)

OUTPUT

DC VOLTAGE
54V
RATED CURRENT
3.45A
RATED POWER
186.3W
RIPPLE & NOISE (max.)Note.2
200mVp-p
VOLTAGE ADJ. RANGENote.5
49 ~ 58V
CURRENT ADJ. RANGE
1.72 ~ 3.45A
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
59 ~ 65V
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-185-54 Block Diagram
Block Diagram
HEP-185-54 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-185-54 for a 54V industrial DC bus or control application?

Yes, this model provides a constant 54V output rated at 186.3W and 3.45A, which suits equipment built around a 54V DC bus. It is intended for systems that specifically require 54V rather than 48V or 24V output.

Is the HEP-185-54 a good fit for 54V automation or communications equipment?

It can be used for automation or communications equipment designed for a 54V constant-voltage supply, provided the load remains within 3.45A and 186.3W. The 90-264VAC input range (277VAC operational) also helps in facilities where the incoming AC source may vary.

Can this model power 54V embedded systems in demanding environments?

Yes, if the embedded system is designed for 54V DC constant-voltage input and stays within the unit's 186.3W and 3.45A output limits. The 94% typical efficiency, IP68 rating, and 10G vibration resistance support use in more demanding equipment environments.

Is the HEP-185-54 suitable for wet or outdoor locations?

This version is rated IP68 and operates from -55°C to +70°C (subject to the derating curve), so it is the better choice where stronger protection against water exposure is needed. That also makes it suitable for harsh indoor or outdoor service conditions.

What are the 54V options around the HEP-185-54 in the HEP family?

On this sheet, the 54V options are the HEP-185-54 (IP68) and the HEP-185-54A (IP65), both rated 186.3W at 3.45A. The other HEP-185 outputs are 156W at 12V, 172W at 15V, and 187.2W at 24V, 36V and 48V. Ratings of other HEP power classes are listed on their own datasheets.

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Mean Well HEP-185-54 Power Supply 186.3W 54V
Mean Well

Mean Well HEP-185-54 Power Supply 186.3W 54V 3.45A

Log in to see price

HEP-185-54 is the 54V output model of this series: rated current 3.45A, rated power 186.3W, 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 54V
  • 100W 54V Adjustable
  • 150W 54V
  • 150W 54V Adjustable
  • 185W 54V
  • 185W 54V Adjustable
  • 240W 54V
  • 240W 54V Adjustable
  • 320W 54V
  • 320W 54V Adjustable
  • 480W 54V
  • 480W 54V Adjustable
  • 600W 54V
  • 600W 54V Adjustable
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