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Mean Well EPS-45S-12 Power Supply 45W 12V 3.8A

Name: Mean Well EPS-45S-12 Power Supply 45W 12V 3.8A
Brand: Mean Well
SKU: EPS-45S-12
Price: 15.69 USD
Availability: InStock
Rating: 5.0 (1 reviews)

5.0 (1 review)

3" x 2"economical non-PFCsmall sizehigh efficiency

SKU EPS-45S-12

$15.69 USD

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Overview

EPS-45S-12 is the 12V output model of this series: rated current 3.8A, rated power 45.6W, typical efficiency 88%.

EPS-45S is a 45W highly reliable green PCB type industrial power supply with a high power density on the 3” by 2” footprint. It accepts 80~264VAC input and offers various output voltages between 3.3V and 48V. The working efficiency is up to 91% and the extremely low no load power consumption is down below 0.1W. EPS-45S is able to be used for ClassⅡ(no FG) system design.

Features

3"×2" miniature size
Universal AC input / Full range
ClassⅡ(without FG) installations
No load power consumption<0.1W
High efficiency up to 91%
For 1U applications
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
-30~70℃wide range of operating temperature
Operating altitude up to 5000 meters
LED indicator for power on
3 years warranty

Specifications

EPS-45S-12Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 3.8A
CURRENT RANGE: 0 ~ 4.18A
RATED POWER: 45.6W
PEAK LOAD(10sec.)^Note.2: 50.2W
RIPPLE & NOISE (max.)^Note.3: 120mVp-p
VOLTAGE ADJ.RANGE: 11.4~13.2V
VOLTAGE TOLERANCE^Note.4: ±2.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±2.0%
SETUP, RISE TIME: 500ms, 30ms / 230VAC 500ms, 30ms / 115VAC at full load
HOLD UP TIME (Typ.): 30ms / 230VAC 12ms / 115VAC at full load

INPUT

VOLTAGE RANGE^Note.5: 80 ~ 264VAC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 88%
AC CURRENT (Typ.): 1.2A / 115VAC 1A / 230VAC
INRUSH CURRENT (Typ.): COLD STAR 30A/115VAC 60A/230VAC
LEAKAGE CURRENT(max.): 0.25mA/264VAC

PROTECTION

OVERLOAD: 115 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 13.8~16.2V Protection type : Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: -30 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03% / ℃ (0 ~ 50℃)
OPERATING ALTITUDE^Note.7: 5000 meters
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note. 8)

SAFETY STANDARDS: UL62368-1, TUV BS EN/EN62368-1, BS EN/EN60335-1, CCC GB4943.1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: I/P-O/P: 3KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032(CISPR32) Class B, BS EN/EN61000-3-2,3, GB9254.1 Class B,GB17625 Class A, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035, Heavy industry Level , EAC TP TC 020

OTHERS

MTBF: 3334.3K hrs min. Telcordia SR-332 (Bellcore) ; 706.6K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 76.2*50.8*24mm or 3" * 2" *0.945" inch (L*W*H)
PACKING: 0.11Kg; 120pcs/14.2Kg/0.94CUFT

Test conditions and notes8

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. 33% Duty cycle maximum within every 30 seconds. Average output power should not exceed the rated power.
3. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
4. Tolerance : includes set up tolerance, line regulation and load regulation.
5. Derating may be needed under low input voltages. Please check the derating curve for more details.
6. Touch current was measured from primary input to DC output.
7. 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).
8. 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 )

Technical drawings

EPS-45S-12 Block Diagram — Block Diagram

EPS-45S-12 Derating Curve — Derating Curve

EPS-45S-12 Mechanical Specification — Mechanical Specification

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Handheld electronic device

Downloads

Datasheet1

EPS-45S-12 datasheetEPS-45S-SPEC.PDF · 2026-03-31 edition PDF Download

Certificates9

Mean Well E183223 UL Certificate PDF Download

Mean Well EPS-65S-45S TUV Certificate PDF Download

Mean Well EPS-45S-65S TUV Certificate PDF Download

Mean Well EPS-45S-65S CB Certificate PDF Download

Mean Well EPS-45S-65S CB(UL) Certificate PDF Download

Mean Well EPS-45S-65S CB(TUV) Certificate PDF Download

Mean Well EPS-45S-EMC Certificate PDF Download

Mean Well EPS-45S-65S CE-dec Certificate PDF Download

Mean Well EPS-45S-65S UK-dec Certificate PDF Download

Test reports1

Mean Well EPS-45S-12 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the EPS-45S-12 for a 12V PLC accessory or control module?

Yes, this constant voltage model delivers 12V at up to 3.8A and 45.6W. It is suitable for industrial control, PLC accessory, or embedded equipment that requires 12V DC within those limits.

Is the EPS-45S-12 suitable for 12V embedded systems inside compact OEM equipment?

It can be a good fit for 12V embedded electronics that draw no more than 3.8A. The 76.2 x 50.8 x 24.0 mm footprint is notably compact for internal OEM assemblies.

Can this 12V power supply be used for industrial monitoring or communication devices?

Yes, if the device is designed for constant 12V input and the total draw stays within 45.6W and 3.8A. The 80-264VAC input range also supports use in equipment intended for varied AC mains conditions.

Would the EPS-45S-12 work in a low-power automation cabinet where space is tight?

It is suited to compact automation equipment because it provides 12V constant voltage output in a 3 inch x 2 inch package. Electrically, the load still needs to remain at or below 3.8A and 45.6W.

Is the EPS-45S-12 rated for outdoor installations?

No IP rating is listed, so the product information does not establish outdoor or washdown protection. The operating temperature range is -30°C to +70°C, which covers a wide temperature span, but enclosure sealing is not specified.

How does the EPS-45S-12 compare with other 12V models in the EPS family?

The EPS-45S spec sheet lists one 12V model, the EPS-45S-12 at 45.6W and 3.8A. The other versions are EPS-45S-3.3 at 26.4W, 3.3V, 8A; EPS-45S-5 at 40W, 5V, 8A; EPS-45S-7.5 at 40.5W, 7.5V, 5.4A; EPS-45S-15 at 45W, 15V, 3A; EPS-45S-24 at 45.6W, 24V, 1.9A; and EPS-45S-48 at 45.1W, 48V, 0.94A. The EPS-45S-12 shares the series' highest rated power of 45.6W with the EPS-45S-24.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well EPS-45S-7.5 Power Supply 40W 7.5V 5.4A	40.5W	7.5V	5.4A	IP20	$15.69	View
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Mean Well EPS-45S-48 Power Supply 45W 48V 940mA	45.1W	48V	0.94A	IP20	$15.69	View
Mean Well EPS-45S-3.3 Power Supply 26W 3.3V 8A	26.4W	3.3V	8A	IP20	$15.69	View
Mean Well EPS-45S-24 Power Supply 45W 24V 1.9A	45.6W	24V	1.9A	IP20	$15.69	View
Mean Well EPS-45S-15 Power Supply 45W 15V 3A	45W	15V	3A	IP20	$15.69	View

Customer reviews

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Reviewed by 1 customer across the EPS series

Replacement PS
By Gary Z.|2026-07-09✓ Verified Buyer
Model: EPS-15-15 ×1, EPS-15-5 ×1, EPS-15-7.5 ×1Quantity: 1
Power Supplies were used to replace the one that was removed on a Phillips PM6680 counter, a +5V, +15V and -7V. They seem to work well so far. I have to put in a boost converter on the +15V for space and not use the +15V EPS.

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