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Mean Well ERDN40-24 Redundancy Module Power Supply 40A

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

SKU ERDN40-24

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Overview

ERDN40-24 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

ERDN40-24Specifications 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: 0~40A 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: <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 ALTITUDE^Note.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: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32) Class B
Radiated BS EN/EN55032(CISPR32) Class B
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

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: 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. All parameters NOT specially mentioned are measured at normal input , 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

ERDN40-24 Derating Curve — Derating Curve

ERDN40-24 Typical Application Notes — Typical Application Notes

ERDN40-24 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 ERDN20-40 EMC Certificate PDF Download

Mean Well ERDN20-40 CE-dec Certificate PDF Download

Mean Well ERDN20-40 UK-dec Certificate PDF Download

Mean Well E183223 UL Certificate PDF Download

Mean Well EAC Certificate PDF Download

Test reports1

Mean Well ERDN40-24 Test Report PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the ERDN40-24 for a redundant 24V PLC or industrial I/O power system?

Yes. The ERDN40-24 is a redundancy module for 24V systems (19~29Vdc input) rated for 40A continuous, and it supports 1+1 and N+1 redundancy. That matches common 24V industrial automation systems that need redundant DC power paths.

Is the ERDN40-24 suitable for 24V machine control cabinets that need monitored redundant power?

Yes. It is built as a redundancy module for 24V systems and includes DC OK relay contacts for monitoring power status. With a 40A continuous rating, it is intended for higher-current 24V control and automation loads.

Can this module be used for redundant 24V embedded controllers or industrial PCs?

Yes, if the equipment runs on a 24V system. The ERDN40-24 handles 24V inputs (19~29Vdc) with up to 40A continuous output current, and its redundancy support is suited to systems that need continued operation if one source drops.

Is the ERDN40-24 appropriate for 24V telecom or network equipment with dual power sources?

It can be used where the equipment runs on 24V and the design calls for a redundant power module. The unit has two input channels, supports 1+1 and N+1 redundancy and is rated for 40A.

How does the ERDN40-24 compare with the other ERDN40 models?

The ERDN40-24 is the 24V model (19~29Vdc input) with a 40A output rating. The ERDN40-12 is for 12V systems (9~14Vdc) and the ERDN40-48 for 48V systems (36~60Vdc), both also 40A. The main difference across the series is the system voltage.

Is the ERDN40-24 suitable for outdoor cabinets or extreme temperatures?

The operating temperature range is -40°C to +80°C (derating above +60°C), so the temperature spec is broad. However, no IP rating is provided, so the listed specs do not confirm outdoor enclosure protection.

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Model	Power	Voltage	Current	IP Rating
Mean Well ERDN40-48 Redundancy Module Power Supply 40A	1920W	48V	40A	IP20	View
Mean Well ERDN40-12 Redundancy Module Power Supply 40A	480W	12V	40A	IP20	View

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