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Mean Well RSD-30L-12 DC-DC Converter - 30W - 18~72V in 12V out 2.5A

Name: Mean Well RSD-30L-12 DC-DC Converter - 30W - 18~72V in 12V out 2.5A
Brand: Mean Well
SKU: RSD-30L-12
Price: 35.12 USD
Availability: InStock

miniature sizeeconomicalwithstand 5G vibration and 70°C operation

SKU RSD-30L-12

$35.12 USD

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In stock

Overview

RSD-30L-12 is the 12V output model of this series: rated current 2.5A, rated power 30W, typical efficiency 90%.

RSD-30 is a 30W enclosed type DC-DC reliable railway converter. This series is compliant with BS EN/EN50155/ IEC60571 railway standard, constituting three types of models with 4:1 wide but different input ranges 9~36V/18~72V/40~160V, suitable for railway and all kinds of transportation systems exploiting the frequently used standard input voltages such as 12V, 24V, 36V, 48V, 72V, 96V and 110V. Various output voltages, 3.3V, 5V, 12V and 24V are available for selection. This series has the capability of working under -40~+70℃, low ripple and noise, supreme EMC characteristics, 4KVDC I/OP-OP, low enclosure profile 25mm and an interior with semi-potted silicone. It does not only well fits the in-car systems or the facilities by rails for railway, trams and buses but also can be used in the harsh environment with high vibration, high dust, extremely low or high temperature, etc.

Features

Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
Ultra compact and 1U low profile(25mm)
4:1 wide input range
No minimum load required
Protections: Short circuit / Overload / Over voltage / Input reverse polarity
4000VDC I/O isolation (reinforced isolation)
Half encapsulated , cooling by free air convection
-40~+70℃ wide working temperature
Built-in constant current limiting circuit
LED indicator for power on
3 years warranty

Specifications

RSD-30L-12Specifications from the official datasheet (2026-07-09 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 2.5A
CURRENT RANGE: 0 ~ 2.5A
RATED POWER: 30W
RIPPLE & NOISE (max.)^Note.2: 60mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.0%
LINE REGULATION: ±0.3%
LOAD REGULATION: ±0.3%
SETUP, RISE TIME: 120ms, 85ms at full load
HOLD UP TIME (Typ.): Please refer to page 5 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE CONTINUOUS: 18 ~ 72VDC
EFFICIENCY (Typ.): 90%
DC CURRENT (Typ.): 0.52A/48V
INRUSH CURRENT (Typ.): 20A/48VDC
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-Comply with S1 level

PROTECTION

OVERLOAD: 105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 13.8 ~ 16.2V Protection type : Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: -40 ~ +55℃ (no derating) ; +70℃ @ 60% load by free air convection ; +70℃ (no derating with external base plate)
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP.: -40 ~ +85℃
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes ; Mounting : compliance to IEC61373
OPERATING ALTITUDE: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1, UL 62368-1, AS/NZS 62368-1, EAC TP TC 004 approved, Design refer to BS EN/EN62368-1
WITHSTAND VOLTAGE: I/P-O/P:4KVDC I/P-FG:2.5KVDC O/P-FG:2.5KVDC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032 Class A
Radiated BS EN/EN55032 Class B
Harmonic Current BS EN/EN61000-3-2
Voltage Flicker BS EN/EN61000-3-3 -----; BS EN/EN55035
EMC IMMUNITY: Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, ±8KV air; Level 3, ±6KV contact
Radiated Field BS EN/EN61000-4-3 Level X, 20V/m
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV at power
Surge BS EN/EN61000-4-5 Level 3,1KV Line-Line, Level 3, 2KV Line-Earth
Conducted BS EN/EN61000-4-6 Level 3
RAILWAY STANDARD: Compliance to BS EN/EN45545-2 for fire protection ;BS EN/EN50155 / IEC60571 including IEC61373 for shock & vibration, BS EN/EN50121-3-2 for EMC

Parameter	Standard	Test Level
Conducted	BS EN/EN55032	Class A
Radiated	BS EN/EN55032	Class B
Harmonic Current	BS EN/EN61000-3-2
Voltage Flicker	BS EN/EN61000-3-3	-----; BS EN/EN55035

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, ±8KV air; Level 3, ±6KV contact
Radiated Field	BS EN/EN61000-4-3	Level X, 20V/m
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV at power
Surge	BS EN/EN61000-4-5	Level 3,1KV Line-Line, Level 3, 2KV Line-Earth
Conducted	BS EN/EN61000-4-6	Level 3

OTHERS

MTBF: 3093.5K hrs min. Telcordia SR-332 (Bellcore) ; 396.9K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 113*60*25mm (L*W*H)
PACKING: 0.25Kg; 56pcs/15Kg/0.81CUFT

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at 24,48VDC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets 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 )
5. Strongly recommended that external output capacitance should not exceed 5000uF.
6. 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).

Technical drawings

RSD-30L-12 Block Diagram — Block Diagram

RSD-30L-12 Input Under-Voltage Protection — Input Under-Voltage Protection

RSD-30L-12 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

RSD-30L-12 Parallel and Series Connection — Parallel and Series Connection

RSD-30L-12 Overload Protection — Overload Protection

RSD-30L-12 Derating Curve — Derating Curve

RSD-30L-12 Suitable installation methods are shown as below. Since… — Suitable installation methods are shown as below. Since…

RSD-30L-12 b.Operate with additional iron plate — b.Operate with additional iron plate

RSD-30L-12 Mechanical Specification — Mechanical Specification

Typical applications

Bus, tram, metro or railway system
Wireless network
Telecom or datacom system
Highly vibrating, highly dusty, extremely low or high temperature harsh environment

Downloads

Datasheet1

RSD-30L-12 datasheetRSD-30-SPEC.PDF · 2026-07-09 edition PDF Download

Certificates7

Mean Well RSD-30-EN50155 Certificate PDF Download

Mean Well RSD-30-CB(UL) Certificate PDF Download

Mean Well RSD-30-EMC Certificate PDF Download

Mean Well RSD-30-CE-dec Certificate PDF Download

Mean Well RSD-30-UK-dec Certificate PDF Download

Mean Well E183223 UL Certificate PDF Download

Mean Well EAC Certificate PDF Download

Test reports1

Mean Well RSD-30L-12 Test Report PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the RSD-30L-12 in a 24V, 36V, or 48V control system that needs a 12V rail?

Yes, this model is suited to systems that fall within its 18-72VDC input range and need regulated 12V output. Its 30W and 2.5A output rating fit lower-power 12V control and embedded loads derived from higher-voltage source systems.

Is the RSD-30L-12 a fit for 12V automation electronics in higher-voltage industrial equipment?

It is appropriate when the higher-voltage source is within 18-72VDC and the 12V load stays within 30W and 2.5A. This makes it relevant for machine-level electronics that need a smaller 12V auxiliary supply from a broader input range.

Can this converter power 12V embedded devices in vehicles or battery-based platforms with wider input variation?

Yes, its 18-72VDC input range sits higher than the 9-36VDC RSD-30G versions, which helps in platforms with higher nominal source voltage. The 12V output remains limited to 30W and 2.5A, so it fits smaller embedded or control loads rather than larger 12V devices.

Is the RSD-30L-12 meant for harsh temperature environments or outdoor exposure?

Its operating temperature range is specified at -40°C to +55°C at full load, extending to +70°C at 60% load or with an external base plate, so it is designed for a wide temperature window. No IP rating is provided in the listed specs, so direct outdoor exposure or washdown suitability is not confirmed here.

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Model	Power	Voltage	Current	IP Rating
Mean Well RSD-30L-24 DC-DC Converter - 30W - 18~72V in 24V out 1.25A	30W	24V	1.25A	IP20	View

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