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Mean Well

Mean Well MDR-40-12 Single Output Industrial Power Supply 40W 12V 3.33A - DIN Rail

ultra slimbuilt-in active PFC function
SKU MDR-40-12
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MDR-40-12
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Overview

MDR-40-12 is the 12V output model of this series: rated current 3.33A, rated power 40W, typical efficiency 85%.

Features

  • Universal AC input/Full range
  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • Can be installed on DIN rail TS-35/7.5 or 15
  • Class I, Div 2 Hazardous Locations T4
  • LED indicator for power on
  • DC OK relay contact
  • No load power consumption<0.75W
  • 100% full load burn-in test
  • 3 years warranty

Specifications

MDR-40-12Specifications from the official datasheet (2024-10-30 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
3.33A
CURRENT RANGE
0 ~ 3.33A
RATED POWER
40W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE ADJ. RANGE
12 ~ 15V
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±1.0%
LOAD REGULATION
±1.0%
SETUP, RISE TIMENote.5
500ms, 30ms/230VAC 500ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.)
50ms/230VAC 20ms/115VAC at full load

INPUT

VOLTAGE RANGE
85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
85%
AC CURRENT (Typ.)
1.1A/115VAC 0.7A/230VAC
INRUSH CURRENT (Typ.)
COLD START 30A/115VAC 60A/230VAC
LEAKAGE CURRENT
<1mA / 240VAC

PROTECTION

OVERLOAD
105 ~ 150% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE
15.6 ~ 18V Protection type : Shut down o/p voltage, re-power on to recover

FUNCTION

DC OK SIGNAL
Relay contact rating(max.): 30V/1A resistive

ENVIRONMENT

WORKING TEMP.
-20 ~ +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℃)
VIBRATION
Component : 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes ; Mounting : Compliance to IEC60068-2-6

SAFETY & EMC

SAFETY STANDARDS
UL508, UL62368-1, TUV BS EN/EN62368-1,Class I, Div. 2 Group A, B, C, D Hazardous Locations T4, EAC TP TC 004, BSMI CNS14336-1, AS/NZS 60950.1 ,IS13252(Part1)/IEC60950-1(except 48V)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), BS EN/EN61204-3 Class B, BS EN/EN61000-3-2,-3, EAC TP TC 020, CNS13438 Class B
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2, 3, 4, 5, 6, 8, 11, BS EN/EN55035, BS EN/EN61000-6-2, BS EN/EN61204-3, heavy industry level, EAC TP TC 020

OTHERS

MTBF
2418.5K hrs min. Telcordia SR-332 (Bellcore) ; 301.7K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
40*90*100mm (W*H*D)
PACKING
0.3Kg; 42pcs/13.6Kg/0.82CUFT
Test conditions and notes6
  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. 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. Length of set up time is measured at first cold start. Turning ON/OFF the power supply may lead to increase of the set up time.
  6. 6. 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

MDR-40-12 Mechanical Specification
Mechanical Specification
MDR-40-12 Block Diagram
Block Diagram
MDR-40-12 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the MDR-40-12 for a 12V PLC or control panel circuit?

Yes, this model is suited to 12V industrial control applications that need a regulated 12V output up to 3.33A. Its DIN rail form factor and compact 40 x 90 x 100 mm (W x H x D) size make it appropriate for control panels where space is limited.

Is the MDR-40-12 a good fit for building management or access control panels that run on 12V DC?

It can be used where the system requires 12V DC and the total load stays within 40W and 3.33A. The wide 85-264VAC input is useful in building and facility panels fed from standard AC sources.

Can this power supply support 12V sensors, relays, and small automation loads in one cabinet?

It is intended for 12V DC loads with a combined demand up to 40W or 3.33A. That makes it suitable for grouped low-power automation devices in a DIN rail cabinet, provided the total draw stays within the unit's rating.

Would the MDR-40-12 work in a compact DIN rail enclosure with limited space?

Yes, the unit is built for mounting on TS-35/7.5 or TS-35/15 DIN rail and its housing measures 40 x 90 x 100 mm (W x H x D). The 40 mm width is useful in narrow control enclosures where panel density matters.

Is the MDR-40-12 meant for open-air use or for installation inside a control cabinet?

This model is generally suited to use inside a control cabinet or enclosure rather than exposed locations. The stated operating range is -20C to +70C with output derating at higher ambient temperatures (see the derating curve), and no outdoor or washdown protection rating is listed in the provided specs.

How does the MDR-40-12 compare with other MDR series DIN rail models?

Within the MDR-40 series, the MDR-40-12 delivers 12V at 3.33A for 40W. The other versions are MDR-40-5 at 5V, 30W and 6A, MDR-40-24 at 24V, 40.8W and 1.7A, and MDR-40-48 at 48V, 39.8W and 0.83A. All share the 85-264VAC input, convection cooling, DC OK relay and the 40 x 90 x 100 mm DIN rail housing.

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Mean Well MDR-40-12 Single Output Industrial Power Supply 40W 12V 3.33A - DIN Rail
Mean Well

Mean Well MDR-40-12 Single Output Industrial Power Supply 40W 12V 3.33A - DIN Rail

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MDR-40-12 is the 12V output model of this series: rated current 3.33A, rated power 40W, typical efficiency 85%.

Features

  • Universal AC input/Full range
  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • Can be installed on DIN rail TS-35/7.5 or 15
  • Class I, Div 2 Hazardous Locations T4
  • LED indicator for power on
  • DC OK relay contact
  • No load power consumption<0.75W
  • 100% full load burn-in test
  • 3 years warranty

Model

  • 10W 12V
  • 100W 12V
  • 20W 12V
  • 40W 12V
  • 60W 12V
View product

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