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Mean Well

Mean Well ERDN20-48 Redundancy Module Power Supply 20A

redundancy modulesupport 1+1 and 1+N redundancyrelay contacts for monitoring power status
SKU ERDN20-48
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Overview

ERDN20-48 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

ERDN20-48Specifications from the official datasheet (2026-03-06 edition)

INPUT

NUMBER OF INPUT
2 Channels
DC NORMAL VOLTAGE
48Vdc
DC VOLTAGE RANGE
36~60Vdc
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.)
65Vdc

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
<34.2V or >63V (±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

ERDN20-48 20A Enclosed Type Redundancy Module
20A Enclosed Type Redundancy Module
ERDN20-48 Output Derating VS Input Voltage
Output Derating VS Input Voltage
ERDN20-48 1. 1+1 Redundancy
1. 1+1 Redundancy
ERDN20-48 2. 1+N Redundancy
2. 1+N Redundancy
ERDN20-48 3. Single Use
3. Single Use
ERDN20-48 Illustration (page 5)
Illustration (page 5)
ERDN20-48 Dimensions (mm)
Dimensions (mm)
ERDN20-48 Function Connector(CN11): TKP DH2I-2X2 or equivalent
Function Connector(CN11): TKP DH2I-2X2 or equivalent
ERDN20-48 Illustration (page 5)
Illustration (page 5)

Downloads

FAQ

Can I use the ERDN20-48 for a 48V redundant telecom or industrial DC bus?

Yes, it is the 48V version of this redundancy module, with a 36~60Vdc input range and a 20A continuous rating. The support for 1+1 and 1+N redundancy makes it relevant for systems that need redundant 48V bus continuity.

Is the ERDN20-48 a fit for 48V automation systems with high current demand?

It is designed for 48V systems with loads up to 20A continuous, and 30A peak for 5 seconds. That capacity suits higher-power 48V control and industrial DC systems that require redundancy rather than a single-source design.

Can the ERDN20-48 be used where power-loss monitoring is required on a 48V rail?

Yes, the listed features include relay contacts for monitoring power status. Combined with its 48V, 20A rating, that makes it applicable where redundant 48V power status needs to be supervised.

What is the difference between ERDN20-48 and the other ERDN20 voltage versions?

The ERDN20 series includes the ERDN20-5 for 5V, ERDN20-12 for 12V, ERDN20-24 for 24V and ERDN20-48 for 48V systems, all rated at 20A. ERDN20-48 is the highest-voltage version, with a 36~60Vdc input range, 65Vdc max. input reverse voltage and an alarm at <34.2V or >63V.

Can the ERDN20-48 handle low-temperature or high-temperature industrial environments?

The specified operating range is -40°C to +80°C, with derating above +60°C, so the temperature rating is broad for industrial use. No IP rating is provided, so the published specs do not establish outdoor exposure protection.

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Mean Well ERDN20-48 Redundancy Module Power Supply 20A
Mean Well

Mean Well ERDN20-48 Redundancy Module Power Supply 20A

Log in to see price

ERDN20-48 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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