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Mean Well

Mean Well AD-55A Security Power Supply 51.38W 13.8V 3.5A - UPS

100% full load burn-in testfixed switching frequency at 45KHzUPS function
SKU AD-55A
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Select model — 5 in this family

AD-55A
Available to order
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Overview

AD-55A is the model of this series: rated power 51.38W, typical efficiency 71%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage
  • Battery low protections
  • Cooling by free air convection
  • 100% full load burn-in test
  • Fixed switching frequency at 45KHz
  • 2 years warranty

Specifications

AD-55ASpecifications from the official datasheet (2024-09-30 edition)

OUTPUT

OUTPUT NUMBER
CH1 / CH2
DC VOLTAGE CH1
13.8V
DC VOLTAGE CH2
13.4V
RATED CURRENT CH1
3.5A
RATED CURRENT CH2
0.23A
CURRENT RANGE CH1
0 ~ 4A
CURRENT RANGE CH2
--------
RATED POWER
51.38W
RIPPLE & NOISE (max.) CH1Note.2
100mVp-p
RIPPLE & NOISE (max.) CH2Note.2
--------
VOLTAGE ADJ. RANGE
CH1: 12 ~ 14.5V
VOLTAGE TOLERANCE CH1Note.3
±1.0%
VOLTAGE TOLERANCE CH2Note.3
--------
LINE REGULATION CH1
±0.5%
LINE REGULATION CH2
--------
LOAD REGULATION CH1
±0.5%
LOAD REGULATION CH2
--------
SETUP, RISE TIME
800ms, 50ms/230VAC 1600ms, 50ms/115VAC at full load
HOLD UP TIME (Typ.)
80ms/230VAC 16ms/115VAC at full load

INPUT

VOLTAGE RANGE
88 ~ 264VAC 124 ~ 370VDC
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
71%
AC CURRENT (Typ.)
1.6A/115VAC 1A/230VAC
INRUSH CURRENT (Typ.)
COLD START 20A/115VAC 40A/230VAC
LEAKAGE CURRENT
<1mA / 240VAC

PROTECTION

OVERLOAD
105 ~ 150% rated output power Protection type : AC Charging Mode : Hiccup mode, recovers automatically after fault condition is removed UPS Mode : Protected by internal fuse
OVER VOLTAGE
CH1:15.87 ~ 18.63V Protection type : Hiccup mode, recovers automatically after fault condition is removed
BATTERY LOW
9.5 ~ 11V

FUNCTION

DC ALARM SIGNAL(OPTIONAL)
AC fail CN1 PIN2 Battery low under charge voltage 82.5%±2% CN1 PIN1 Normal 0.8V max. Abnormal 5V±0.5V

ENVIRONMENT

WORKING TEMP.
-10 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-20 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0~50℃) on CH1 output
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS
UL62368-1, TUV BS EN/EN62368-1, AS/NZS 62368.1, 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, 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, EAC TP TC 020

OTHERS

MTBF
2380.9K hrs min. Telcordia SR-332 (Bellcore) ; 548.7K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
159*97*38mm (L*W*H)
PACKING
0.5Kg; 24pcs/12.6Kg/0.83CUFT
Test conditions and notes5
  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 0.1μF & 47μF parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. 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 360mm*360mm 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 )
  5. 5. 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

AD-55A Mechanical Specification
Mechanical Specification
AD-55A Block Diagram
Block Diagram
AD-55A Derating Curve
Derating Curve

Downloads

FAQ

What kinds of systems is the AD-55A designed to support?

The Mean Well AD-55A is designed for lower-power security and backup-power applications that need a 13.8V DC output. With 51.38W of rated power and 3.5A output current, it is a practical fit for smaller alarm, access control, and related low-voltage support loads that benefit from UPS-style DC supply behavior.

Can the AD-55A be used in battery-backed security power systems?

Yes. The AD-55A is a single-output supply with a built-in battery charger (UPS function), so it is suitable for systems where the DC load is part of a battery-backed architecture. The connected equipment still needs to remain within the supply's 13.8V, 3.5A, and 51.38W rating.

Is the AD-55A better for smaller 13.8V loads than the AD-155 series?

It suits modest loads. The AD-55A provides 13.8V at 3.5A rated current (0-4A current range) for 51.38W of rated power, which makes it a fit for lighter-duty systems. The AD-155 series is not covered by this datasheet, so check that model's own datasheet before comparing capacities.

Will the AD-55A run from common AC mains inputs?

Yes. The listed AC input range is 88-264VAC, so the AD-55A can operate from common AC mains environments within that range, including typical 120V and 240V supplies. That helps simplify deployment across multiple sites.

How does the AD-55A compare with other AD series models?

The AD-55A is the 13.8V model of the AD-55 series, providing 51.38W at 13.8V and 3.5A. By comparison, the AD-55B delivers 53.92W at 27.6V and 1.8A. Both share the same 88-264VAC input range and 159*97*38mm size, so the choice comes down to your required output voltage (12V vs 24V battery systems) and load size.

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Mean Well AD-55A Security Power Supply 51.38W 13.8V 3.5A - UPS
Mean Well

Mean Well AD-55A Security Power Supply 51.38W 13.8V 3.5A - UPS

Log in to see price

AD-55A is the model of this series: rated power 51.38W, typical efficiency 71%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage
  • Battery low protections
  • Cooling by free air convection
  • 100% full load burn-in test
  • Fixed switching frequency at 45KHz
  • 2 years warranty

Model

  • 13.8V 151W
  • 26.7V 155W
  • 54V 156W
  • 13.8V 51W
  • 26.7V 54W
View product

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