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Mean Well DRA-40-12 Single Output Switching Power Supply 40W 12V 3.34A - DIN Rail

Io can be adjusted 10%~100% by 1-10VDCPWM or resistanceVo adjustablepass LPS

SKU DRA-40-12

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Overview

DRA-40-12 is the 12V output model of this series: rated current 3.34A, rated power 40.08W, typical efficiency 85%.

DRA-40 is one 40W AC/DC DIN rail power supply, featuring the adjustable output current. Users are able to easily change the constant output current level, via 1~10Vdc, PWM signal or resistance. DRA-40 can be mounted on DIN rail TS-35/7.5 or 15; in addition, the width of the unit is only 40mm that it is well suited for the installation in a limited spacing. DRA-40 accepts the universal AC input between 90VAC and 264VAC; the efficiency is up to 87% that the entire series can operate, under free air convection, from -30℃ through 70℃.

Features

Universal AC input / Full range
Protections: Short circuit / Overload / Over voltage
Can be installed on DIN rail TS-35/7.5 or 15
Output Voltage adjustable through internal potentiometer
Output Current adjustable through external 1~10Vdc, PWM signal or resistance
Cooling by free air convection
Pass LPS
LED indicator for power on
100% full load burn-in test
3 years warranty

Specifications

DRA-40-12Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 12V
CONSTANT CURRENT REGION: 3~12V
RATED CURRENT: 3.34A
CURRENT RANGE: 0 ~ 3.34A
RATED POWER: 40.08W
RIPPLE & NOISE (max.)^Note.2: 120mVp-p
VOLTAGE ADJ. RANGE: 12 ~ 15V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME^Note.4: 400ms, 90ms/230VAC 800ms, 90ms/115VAC at full load
HOLD UP TIME (Typ.): 50ms/230VAC 10ms/115VAC at full load

INPUT

VOLTAGE RANGE: 90 ~ 264VAC 127 ~ 370VDC [DC input operation possible by connecting AC/L(+), AC/N(-)]
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 85%
AC CURRENT (Typ.): 0.8A/115VAC 0.6A/230VAC
INRUSH CURRENT (Typ.): COLD START 30A/115VAC 60A/230VAC

PROTECTION

OVERLOAD: 95 ~ 108% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 14.49 ~ 18.63V 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 ~ 55℃) on output
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note 5)

SAFETY STANDARDS: UL62368-1, TUV BS EN/EN62368-1, 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, BS EN/EN61204-3, light industry level, criteria A, EAC TP TC 020

OTHERS

MTBF: 2940.7K hrs min. Telcordia SR-332 (Bellcore) ; 439.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 40*90*100mm (W*H*D)
PACKING: 0.3Kg; 42pcs/13.6Kg/0.82CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
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. Tolerance : includes set up tolerance, line regulation and load regulation.
4. 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.
5. The power supply is considered a component which will be installed into a final equipment. 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 )
6. Installation clearances : 40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended when loaded permanently with full power. In case the adjacent device is a heat source, 15mm clearance is recommended.
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).

Technical drawings

DRA-40-12 Derating Curve — Derating Curve

DRA-40-12 10K~100K Ohms resistance — 10K~100K Ohms resistance

DRA-40-12 depends on the configuration of the end systems. — depends on the configuration of the end systems.

DRA-40-12 Mechanical Specification — Mechanical Specification

DRA-40-12 Installation Instruction — Installation Instruction

Typical applications

Machine vision inspection system
Plant cultivation system

Downloads

Certificates4

UL Certificate (DRA-40)(EN) PDF Download

EMC Certificate (DRA-40)(EN) PDF Download

TUV Certificate (DRA-40)(EN) PDF Download

CB Certificate (DRA-40)(EN) PDF Download

Test reports1

Test Report (DRA-40-12)(EN) PDF Download

Catalogues2

Mean Well Catalog (Industrial) PDF Download

Mean Well DIN RAIL Catalog PDF Download

FAQ

Can the DRA-40-12 be used in a 12V PLC or industrial automation control panel?

Yes. The DRA-40-12 provides 12V DC at up to 3.34A with 40.08W output, which suits 12V control panel loads that stay within those limits. Its DIN rail format and 100.0 × 90.0 × 40.0 mm size are also appropriate for cabinet mounting.

Is the DRA-40-12 a good fit for building management cabinets with 12V control devices?

It can be used where the building management panel needs a 12V DC supply up to 3.34A. The 40.08W output supports lower-power 12V control electronics in enclosed DIN rail installations. Buyers should make sure the cabinet load does not exceed 12V, 3.34A, or 40.08W.

Can this model be used where the DC output needs to be adjusted for control applications?

Yes. The DRA-40-12 lists output current adjustment from 10% to 100% by 1-10VDC, PWM, or resistance, and it also states that output voltage is adjustable. That makes it suitable for control cabinet applications where adjustable 12V output behavior is required within its 40.08W and 3.34A limits.

Is the DRA-40-12 suitable for control cabinet or enclosure use over a wide temperature range?

Yes. Its operating temperature range is -30°C to +70°C, with the output load derated at higher ambient temperatures according to the derating curve, which supports enclosure use in demanding indoor industrial conditions. The DIN rail format and 100.0 × 90.0 × 40.0 mm dimensions also fit standard control cabinet layouts.

What is the difference between the DRA-40-12 and the other DRA DIN rail models?

The DRA-40-12 is 40.08W at 12V and 3.34A. Its sister model in the DRA-40 series, the DRA-40-24, is 40.8W at 24V and 1.7A. The differences are output voltage, output current, and total power.

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Model	Power	Voltage	Current	IP Rating
Mean Well DRA-40-24 Single Output Switching Power Supply 40W 24V 1.7A - DIN Rail	40.8W	24V	1.7A	IP20	View

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