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Mean Well HEP-185-54A 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-185-54A
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Select model — 14 in this family

HEP-185-54A
Available to order
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Overview

HEP-185-54A 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-185-54ASpecifications 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-185-54A Block Diagram
Block Diagram
HEP-185-54A 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-185-54A for a 54V control cabinet or machine DC supply?

Yes, this unit is a 54V constant-voltage model rated for 186.3W and 3.45A, which makes it suitable for machine and control systems built around 54V DC. It is best matched to loads that specifically call for 54V output.

Is the HEP-185-54A suitable for 54V industrial electronics or embedded hardware?

It is a good fit for industrial electronics or embedded hardware that requires a stable 54V DC source and stays within 3.45A and 186.3W. The 94% typical efficiency and IP65 rating can be useful where low maintenance and heat control matter.

Can this power supply be used in a 54V communications or monitoring system?

Yes, for communications or monitoring equipment designed for a 54V constant-voltage input, this model provides 186.3W with up to 3.45A output current. Its safety approvals include UL62368-1 and IEC62368-1 (design refers to BS EN/EN62368-1), plus EAC approval, which can matter in regulated industrial environments.

Is the HEP-185-54A intended for indoor use only, or can it handle exposed conditions?

The HEP-185-54A carries an IP65 water-resistant rating and a -55°C to +70°C operating range (subject to the derating curve), so it can handle demanding indoor installations and many outdoor or semi-exposed environments. Its 10G vibration resistance also supports use in harsh industrial settings.

How does the HEP-185-54A fit into the HEP 54V lineup?

On this sheet, the 54V models are the HEP-185-54A (IP65) and the HEP-185-54 (IP68), both rated 186.3W at 3.45A. Across the HEP-185 series the other outputs are 156W at 12V, 172W at 15V, and 187.2W at 24V, 36V and 48V. This model is the IP65, 186.3W, 3.45A option in that 54V pair.

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

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

Log in to see price

HEP-185-54A 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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