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Mean Well

Mean Well ERDN20-24 Redundancy Module Power Supply 20A

redundancy modulesupport 1+1 and 1+N redundancyrelay contacts for monitoring power status
SKU ERDN20-24
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Overview

ERDN20-24 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

ERDN20-24Specifications from the official datasheet (2026-03-06 edition)

INPUT

NUMBER OF INPUT
2 Channels
DC NORMAL VOLTAGE
24Vdc
DC VOLTAGE RANGE
19~29Vdc
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
<18V or >31V (±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

ERDN20-24 20A Enclosed Type Redundancy Module
20A Enclosed Type Redundancy Module
ERDN20-24 Output Derating VS Input Voltage
Output Derating VS Input Voltage
ERDN20-24 1. 1+1 Redundancy
1. 1+1 Redundancy
ERDN20-24 2. 1+N Redundancy
2. 1+N Redundancy
ERDN20-24 3. Single Use
3. Single Use
ERDN20-24 Illustration (page 5)
Illustration (page 5)
ERDN20-24 Dimensions (mm)
Dimensions (mm)
ERDN20-24 Function Connector(CN11): TKP DH2I-2X2 or equivalent
Function Connector(CN11): TKP DH2I-2X2 or equivalent
ERDN20-24 Illustration (page 5)
Illustration (page 5)

Downloads

FAQ

Can I use the ERDN20-24 in a 24V redundant PLC or automation control system?

Yes, the ERDN20-24 is the 24V version of this redundancy module, with a 19~29Vdc input range, and is rated for up to 20A continuous output. Its listed features include support for 1+1 and N+1 redundancy, which aligns with redundant 24V control power designs.

Is the ERDN20-24 suitable for 24V industrial control panels that need power status monitoring?

It can be a fit for 24V control systems that need redundant power architecture and monitoring. The feature list includes relay contacts for monitoring power status, and the module is rated for 20A output.

Can the ERDN20-24 be used for redundant 24V DC loads in factory automation?

Yes, when the system runs on 24V DC and the total load stays within 20A continuous (30A peak for 5 seconds). The module is specifically described as a redundancy module, not a general-purpose single-output PSU.

How does the ERDN20-24 compare with other ERDN20 redundancy modules?

The series includes the ERDN20-5 for 5V, ERDN20-12 for 12V, ERDN20-24 for 24V and ERDN20-48 for 48V systems. All are rated for 0~20A continuous and 30A peak for 5 seconds; they differ in input voltage range and alarm thresholds, e.g. 19~29Vdc and <18V or >31V on the ERDN20-24.

Is the ERDN20-24 appropriate for harsh indoor environments or outdoor installations?

Its operating temperature range is -40°C to +80°C (derating above +60°C), which supports demanding temperature conditions. No IP rating is listed in the provided specs, so these specs do not identify it as an outdoor-rated module.

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Mean Well ERDN20-24 Redundancy Module Power Supply 20A
Mean Well

Mean Well ERDN20-24 Redundancy Module Power Supply 20A

Log in to see price

ERDN20-24 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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