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Mean Well

Mean Well ERDN40-12 Redundancy Module Power Supply 40A

redundancy modulesupport 1+1 and 1+N redundancyrelay contacts for monitoring power status
SKU ERDN40-12
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Overview

ERDN40-12 is the model of this series: rated current 0~40A per input Continuous, typical efficiency 98%.

The E RDN 4 0 series is a 4 0A redundancy module that can be used with a power supply to improve overall system operation reliability. Product key features include: 12V/24 V/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°C.

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°C ultra-wide operating temperature ( >+60°C derating)
  • Built-in 2 channels DC OK signal and alarm relay contact
  • 3 years warranty

Specifications

ERDN40-12Specifications from the official datasheet (2026-03-06 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.)
0.2V
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 ALTITUDENote.3
5000 meters/OVC II

SAFETY & EMC

SAFETY STANDARDS
IEC62368-1, UL62368-1, EAC TP TC 004 approved, Design refer to BS EN/EN62368-1
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
ParameterStandardTest Level
ConductedBS EN/EN55032(CISPR32)Class B
RadiatedBS EN/EN55032(CISPR32)Class B
EMC IMMUNITY

BS EN/EN55035, BS EN/EN61000-6-2(BS EN/EN50082-2)

ParameterStandardTest Level
ESDBS EN/EN61000-4-2Level 4, 15KV air; Level 3, 8KV contact; criteria A
RadiatedBS EN/EN61000-4-3Level 3, 10V/m; criteria A
EFT / BurstBS EN/EN61000-4-4Level 3, 2KV; criteria A
SurgeBS EN/EN61000-4-5Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-Chassis ;criteria A
ConductedBS EN/EN61000-4-6Level 3, 10V; criteria A
Magnetic FieldBS EN/EN61000-4-8Level 4, 30A/m; criteria A

OTHERS

MTBF
1687.9K hrs min. Telcordia SR-332 (Bellcore) ; 294.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
97*99*36mm (W*D*H)
PACKING
0.276Kg;45psc/14Kg/0.94CUFT
Test conditions and notes4
  1. 1. All parameters NOT specially mentioned are measured at normal input , rated load and 25℃ of ambient temperature.
  2. 2. Derating may be needed over high ambient temperature. Please check the derating curve for more details.
  3. 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. 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

ERDN40-12 Derating Curve
Derating Curve
ERDN40-12 Typical Application Notes
Typical Application Notes
ERDN40-12 Mechanical Specification
Mechanical Specification

Typical applications

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

Downloads

FAQ

Can I use the ERDN40-12 for a redundant 12V PLC or control cabinet power system?

Yes. The ERDN40-12 is a redundancy module for 12V systems (9~14Vdc input) rated for 40A continuous, and it supports both 1+1 and N+1 redundancy. That makes it appropriate for 12V industrial control and automation systems where redundant DC power is required.

Is the ERDN40-12 suitable for 12V embedded or industrial computer loads that need power-path redundancy?

Yes. It is designed as a redundancy module for 12V systems with 40A output current, so it fits 12V embedded and industrial electronics that need a redundant power architecture. The built-in DC OK relay contacts for monitoring power status also support systems that need power-state signaling.

Can this redundancy module be used in a 12V automation panel with multiple power supplies in parallel redundancy?

Yes. The ERDN40-12 supports both 1+1 and N+1 redundancy, which is the intended use case for multi-supply redundant 12V systems. Its 40A continuous output current (60A peak for 5 seconds) defines the 12V load range it is built to support.

Is the ERDN40-12 a good fit for 12V communications or security equipment that must stay online if one supply fails?

It can be a fit for 12V equipment that needs redundant power continuity. The module is designed for 12V systems, rated for 40A, and it includes DC OK relay contacts for monitoring power status in uptime-sensitive systems.

What is the difference between the ERDN40-12, ERDN40-24, and ERDN40-48?

All three are 40A redundancy modules in the same series; they differ in system voltage. The ERDN40-12 is for 12V systems (9~14Vdc input), the ERDN40-24 for 24V systems (19~29Vdc), and the ERDN40-48 for 48V systems (36~60Vdc).

Can the ERDN40-12 be used outdoors or in harsh temperature conditions?

Its operating temperature range is -40°C to +80°C (with derating above +60°C), which covers a wide temperature span. However, no IP rating is listed in these specs, so outdoor suitability is not established by the provided enclosure information.

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Other ERDN40 Models

2 other models
ModelPowerVoltageCurrentIP Rating
Mean Well ERDN40-48 Redundancy Module Power Supply 40A 1920W 48V 40A IP20 View
Mean Well ERDN40-24 Redundancy Module Power Supply 40A 960W 24V 40A IP20 View
View all 7 ERDN Series models
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Mean Well ERDN40-12 Redundancy Module Power Supply 40A
Mean Well

Mean Well ERDN40-12 Redundancy Module Power Supply 40A

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ERDN40-12 is the model of this series: rated current 0~40A per input Continuous, typical efficiency 98%.

The E RDN 4 0 series is a 4 0A redundancy module that can be used with a power supply to improve overall system operation reliability. Product key features include: 12V/24 V/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°C.

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°C ultra-wide operating temperature ( >+60°C derating)
  • Built-in 2 channels DC OK signal and alarm relay contact
  • 3 years warranty

Typical applications

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

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