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Mean Well

Mean Well ERDN20-12 Redundancy Module Power Supply 20A

redundancy modulesupport 1+1 and 1+N redundancyrelay contacts for monitoring power status
SKU ERDN20-12
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Overview

ERDN20-12 is the model of this series: rated current 0~20A per input Continuous, typical efficiency 98%.

The E RDN20 series is a 20A redundancy module that can be used with a power supply to improve overall system operation reliability. Product key features include: 5V/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 5V/12V/24V/48V system
  • Output current up to 20A
  • 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

ERDN20-12Specifications 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
0~20A per input Continuous
VOLTAGE DROP (Vin-Vout) (max.)
0.2V
PEAK CURRENT
0~30A per input 5Sec.
EFFICIENCY (Typ.)
98%
INPUT REVERSE CURRENT (max.)
1mA
INPUT REVERSE VOLTAGE (max.)
40Vdc

OUTPUT

RATED CURRENT
0~20A, Continuous
PEAK CURRENT (max.)
30A, 5Sec.
CAPACITANCE(Typ.)
320uF
STANDBY POWER LOSSES(Typ.)
1.5W

PROTECTION

OVERLOAD
<30A, 5Sec. No damage
SHORT CIRCUIT
<30A, 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
1853.5K hrs min. Telcordia SR-332 (Bellcore) ; 378.7K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
82*99*36mm (W*D*H)
PACKING
0.206Kg;45psc/10.3Kg/0.76CUFT
Test conditions and notes4
  1. 1. All parameters NOT specially mentioned are measured at normal input (5V/12V/24V/48V) , 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

ERDN20-12 20A Enclosed Type Redundancy Module
20A Enclosed Type Redundancy Module
ERDN20-12 Output Derating VS Input Voltage
Output Derating VS Input Voltage
ERDN20-12 1. 1+1 Redundancy
1. 1+1 Redundancy
ERDN20-12 2. 1+N Redundancy
2. 1+N Redundancy
ERDN20-12 3. Single Use
3. Single Use
ERDN20-12 Illustration (page 5)
Illustration (page 5)
ERDN20-12 Dimensions (mm)
Dimensions (mm)
ERDN20-12 Function Connector(CN11): TKP DH2I-2X2 or equivalent
Function Connector(CN11): TKP DH2I-2X2 or equivalent
ERDN20-12 Illustration (page 5)
Illustration (page 5)

Downloads

FAQ

What does the Mean Well ERDN20-12 do?

The ERDN20-12 is a redundancy module designed for DC power systems rather than a standalone AC-DC power supply. It supports 1+1 and N+1 redundant setups by taking two DC inputs and providing one DC output, helping maintain output if one supply path fails.

Is the ERDN20-12 specifically for 12V systems only?

Yes. The ERDN20 series covers 5V, 12V, 24V and 48V systems, but each model is made for one system voltage. The ERDN20-12 is the 12V version, with a 12Vdc normal input voltage and a 9~14Vdc input range; the ERDN20-5, ERDN20-24 and ERDN20-48 cover the other system voltages.

What current capacity does the ERDN20-12 support?

This redundancy module is rated for output current up to 20A. It also allows peak current of 0-30A per input for 5 seconds, and the overload and short circuit protection notes specify no damage below 30A for 5 seconds.

When is the ERDN20-12 a better choice than using a single DC power supply?

The ERDN20-12 is intended for systems that need higher power-path reliability than a single supply can provide. It is a practical choice for industrial control and other DC applications where a redundant 1+1 or N+1 architecture is preferred to reduce downtime risk.

Can the ERDN20-12 be used in demanding industrial environments?

It is specified for operation from -40 to +80 degrees C (with derating above +60 degrees C) and uses free air convection cooling, which suits a wide range of industrial environments. The module also lists EMC compliance to EN55032 Class B and EN61000-4 immunity standards, along with IEC62368-1 and UL62368-1 safety standards.

Does the ERDN20-12 provide status monitoring for redundancy systems?

Yes. It includes built-in 2-channel DC OK signaling and an alarm relay contact for status indication. The general specification also lists the DC OK signal as relay contact.

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Mean Well ERDN20-12 Redundancy Module Power Supply 20A
Mean Well

Mean Well ERDN20-12 Redundancy Module Power Supply 20A

Log in to see price

ERDN20-12 is the model of this series: rated current 0~20A per input Continuous, typical efficiency 98%.

The E RDN20 series is a 20A redundancy module that can be used with a power supply to improve overall system operation reliability. Product key features include: 5V/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 5V/12V/24V/48V system
  • Output current up to 20A
  • 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
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