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Mean Well DRDN40-12 Redundancy Module Power Supply 40A - DIN Rail

redundancy modulesupport 1+1 and N+1 redundancyrelay contacts for monitoring power status

SKU DRDN40-12

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Overview

DRDN40-12 is the model of this series: rated current 0~40A per input Continuous, typical efficiency 98%.

The DRDN40 series is a 40A redundancy module that can be used with a power supply to improve overall system operation reliability. Product key features include:12V/24V/48V input voltage for selection, support N+1 and 1+1 redundancy systems,built-in two rails DC input contacts and single output. The MOSFET technology implemented can reduce heat loss and reduce the voltage difference between the input and output voltages, built-in 2 channels DC OK relay contacts for monitoring output status, ultra-wide operating temperature of -40 to +80℃ and narrow width (55mm).

Features

Support 1+1 and N+1 redundancy system
2 channels input and 1 output
Suitable for redundancy operation of 12V/24V/48V system
Output current up to 40A
Cooling by free air convection
-40~+80℃ ultra-wide operating temperature ( >+60℃ derating)
55mm slim width
Built-in 2 channels DC OK signal and alarm relay contact
3 years warranty

Specifications

DRDN40-12Specifications from the official datasheet (2026-03-31 edition)

INPUT

NUMBER OF INPUT: 2 Channels
DC NORMAL VOLTAGE: 12Vdc
DC VOLTAGE RANGE: 9~14Vdc
RATED CURRENT: 0~40A per input Continuous
VOLTAGE DROP (Vin-Vout) (max.): 0.3V
PEAK CURRENT: 0~60A per input 5Sec.
EFFICIENCY (Typ.): 98%
INPUT REVERSE CURRENT (max.): 1mA
INPUT REVERSE VOLTAGE (max.): 40Vdc

OUTPUT

RATED CURRENT: 0~40A, Continuous
PEAK CURRENT (max.): 60A, 5Sec.
CAPACITANCE(Typ.): 320uF
STANDBY POWER LOSSES(Typ.): 1.5W

PROTECTION

OVERLOAD: <60A,5Sec. No damage
SHORT CIRCUIT: <60A,5Sec. No damage

FUNCTION

REDUNDANCY: For 1+1 redundancy ,and support N+1 redundancy
BOTH INPUTS VOLTAGE ALARM: <8.5V or >14.7V (±5%)
RELAY: 30Vdc/1A resistive load
LED STATUS DISPLAY: Green LED OK

ENVIRONMENT

COOLING: Free air convection
WORKING TEMP.^Note.2: -40 ~ +80℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP.: -40 ~ +85℃
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 60℃ )
VIBRATION: Component:10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC61373
OPERATING ALTITUDE^Note.3: 5000 meters/OVC II

SAFETY & EMC (Note.4)

SAFETY STANDARDS: IEC62368-1, UL62368-1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: IP/OP - Chassis : 0.5KVac ; IP/OP- Relay : 0.5KVac ; Relay - Chassis : 0.5KVac
ISOLATION RESISTANCE: IP/OP - Chassis, IP/OP- Relay, Relay - Chassis:>100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32) Class B
Radiated BS EN/EN55032(CISPR32) Class B
Voltage Flicker ----- -----
Harmonic Current ----- -----
EMC IMMUNITY: BS EN/EN55035, BS EN/EN61000-6-2(BS EN/EN50082-2)

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 4, 15KV air; Level 3, 8KV contact; criteria A
Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A
Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-Chassis ;criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A

Parameter	Standard	Test Level
Conducted	BS EN/EN55032(CISPR32)	Class B
Radiated	BS EN/EN55032(CISPR32)	Class B
Voltage Flicker	-----	-----
Harmonic Current	-----	-----

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 4, 15KV air; Level 3, 8KV contact; criteria A
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m; criteria A
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV; criteria A
Surge	BS EN/EN61000-4-5	Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-Chassis ;criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V; criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m; criteria A

OTHERS

MTBF: 1672.9K hrs min. Telcordia SR-332 (Bellcore) ; 499.5K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 55*125.2*100mm (W*H*D)
PACKING: 0.5Kg;20psc/11Kg/1.49CUFT

Test conditions and notes4

1. All parameters NOT specially mentioned are measured at normal input(12V/24V/48V) , rated load and 25℃ of ambient temperature.
2. Derating may be needed over high ambient temperature. Please check the derating curve for more details.
3. 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).
4. The power supply is considered as an independent unit, but the final equipment still need to re-confirm that the whole system complies with the 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

DRDN40-12 Derating Curve — Derating Curve

DRDN40-12 Typical Application Notes — Typical Application Notes

DRDN40-12 Mechanical Specification — Mechanical Specification

Typical applications

Industrial control system
Semiconductor fabrication equipment
Factory automation
Electro-mechanical apparatus

Downloads

Certificates6

Mean Well DRDN20-DRDN40-ERDN20-ERDN40 CB(UL) Certificate PDF Download

Mean Well DRDN20-40 EMC Certificate PDF Download

Mean Well DRDN20-40 CE-dec Certificate PDF Download

Mean Well DRDN20-40 UK-dec Certificate PDF Download

Mean Well EAC Certificate PDF Download

Mean Well E215312-UL Certificate PDF Download

Test reports1

Mean Well DRDN40-12 Test Report PDF Download

Catalogues2

Mean Well Catalog (Industrial) PDF Download

Mean Well DIN RAIL Catalog PDF Download

FAQ

Can I use the DRDN40-12 for a high-current 12V PLC or machine control panel?

Yes, this model is designed for 12V systems and carries up to 40A continuous (60A peak for 5 seconds). That makes it suitable for higher-current PLC or machine control panels that need redundant 12V power on DIN rail.

Is the DRDN40-12 appropriate for a building management cabinet with larger 12V control loads?

It can be used in a building management cabinet when the 12V control side needs up to 40A of continuous current. The redundancy module supports 1+1 and N+1 redundancy, and the relay contacts help monitor power status in the cabinet.

Can the DRDN40-12 support redundant 12V power for industrial automation enclosures with many relays or controllers?

Yes, it is intended for 12V industrial control applications where the redundant path needs up to 40A continuous. The DIN rail format is well suited to automation enclosures that centralize multiple control loads.

Is this a good choice when I need a 12V redundancy module on DIN rail but with more capacity than slimmer 20A models?

Yes, the DRDN40-12 is rated for 40A continuous at 12V, with 60A peak for 5 seconds. Its housing is 125.2 x 100.0 x 55.0 mm, so it needs 55 mm of rail width but provides 40A of redundant current capacity.

How does the DRDN40-12 compare with the other DRDN40 models?

The DRDN40-12 is rated at 12V and 40A with a 9-14Vdc input range. The DRDN40-24 is 24V and 40A (19-29Vdc), while the DRDN40-48 is 48V and 40A (36-60Vdc). All three share the same 125.2 x 100.0 x 55.0 mm dimensions, 0.5 kg weight, -40°C to +80°C operating temperature, and IEC62368-1, UL62368-1 and EAC TP TC 004 safety approvals.

Is the DRDN40-12 intended for use inside a control cabinet or in exposed conditions?

The published specifications support industrial enclosure use, including DIN rail mounting and operation from -40°C to +80°C. Because no IP rating is listed, it is better suited for installation inside a control cabinet or enclosure than in an exposed area.

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