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Mean Well RSD-500B-12 DC-DC Converter - 420W 16.8-33.6V DC in 12V out 35A

Name: Mean Well RSD-500B-12 DC-DC Converter - 420W 16.8-33.6V DC in 12V out 35A
Brand: Mean Well
SKU: RSD-500B-12
Price: 239.79 USD
Availability: InStock

miniature sizeeconomicalwithstand 5G vibration and 70°C operation

SKU RSD-500B-12

$239.79 USD

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In stock

Overview

RSD-500B-12 is the 12V output model of this series: rated current 35A, rated power 420W, typical efficiency 92%.

RSD-500 series is a 500W enclosed type reliable railway DC-DC converter. This series is compliant with BS EN/EN50155/BS EN/EN45545-2 railway standard, constituting three types of models with 2:1 wide but different input ranges 16.8~33.6V/33.6~67.2V/67.2~154V, suitable for railway and all kinds of transportation systems exploiting the frequently used standard input voltages such as 24V, 36V, 48V, 72V, 96V and 110V.Various output voltages, 12V, 24V and 48V are available for selection. This series has the capability of working under -40~+80℃, low ripple and noise, supreme EMC characteristics, 4KVdc I/O isolation, low enclosure profile 41mm 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
1U low profile 41mm
2:1 wide input range
Fanless design, half encapsulated , cooling by free air convection
-40~+80℃ wide operating temperature
DC output adjustable
Protections: Short circuit / Overload / Over voltage / Over temperature / Input reverse polarity/ Input under voltage protection
4KVdc I/O isolation(Reinforced isolation)
Operating additude up to 5000 meters(Note.5)
LED indicator for power on
3 years warranty

Specifications

RSD-500B-12Specifications from the official datasheet (2026-07-02 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 35A
CURRENT RANGE: 0 ~ 35A
RATED POWER: 420W
RIPPLE & NOISE (max.)^Note.2: 100mVp-p
VOLTAGE ADJ. RANGE: 12 ~ 14V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms
HOLD UP TIME (Typ.): Please refer to page 4 hold up time (Load de-rating curve )

INPUT

VOLTAGE RANGE CONTINUOUS: 16.8 ~ 33.6Vdc
VOLTAGE RANGE 1s^Note.4: 14.4 ~ 16.8Vdc
EFFICIENCY (Typ.): 92%
DC CURRENT (Typ.): 21.5A @24Vdc
INRUSH CURRENT (Typ.): 30A
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-B/C/D type comply with S1 level (3ms)@ full load; B/C type comply with S2 level (10ms)@ 70% load, D- type comply with S2 level (10ms) @ full load

PROTECTION

OVERLOAD: Constant current limiting 105~135% rated output power with auto-recovery
OVER VOLTAGE: 14.4 ~ 17.5V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, re-power on to recover
REVERSE POLARITY: By internal, MOSFET, no damage, recovers automatically after fault condition is removed
UNDER VOLTAGE LOCKOUT: 24Vin :Power ON≥16.8V , OFF≤16.5V

ENVIRONMENT

WORKING TEMP.: -40 ~ +80℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85, 5 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 55℃)
VIBRATION: Component:10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC61373
OPERATING ALTITUDE^Note.5: 5000 meters / OVCⅡ

SAFETY & EMC

SAFETY STANDARDS: UL62368-1, IEC 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 (CISRP32) Class A
Radiated BS EN/EN55032 (CISRP32) Class B
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55035

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 3, 6KV 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-FG ;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
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 (CISRP32)	Class A
Radiated	BS EN/EN55032 (CISRP32)	Class B
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 3, 6KV 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-FG ;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: 834.7K hrs min. Telcordia SR-332 (Bellcore) ; 99.1K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 237*100*41mm (L*W*H)
PACKING: 1.45Kg;10pcs/15.5Kg/0.8CUFT

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at normal input (B:24Vdc , C:48Vdc , D:110Vdc ) , 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. Derating may be needed under low input voltage. Please check the derating curve for more details.
5. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than2000m(6500ft).
6. 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

RSD-500B-12 Block Diagram — Block Diagram

RSD-500B-12 Input Under-Voltage Protection — Input Under-Voltage Protection

RSD-500B-12 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

RSD-500B-12 Overload Protection — Overload Protection

RSD-500B-12 Derating Curve — Derating Curve

RSD-500B-12 methods are similar and share the same derating curve. — methods are similar and share the same derating curve.

RSD-500B-12 methods are similar and share the same derating curve. (2) — methods are similar and share the same derating curve. (2)

RSD-500B-12 Illustration (page 7) — Illustration (page 7)

RSD-500B-12 Mechanical Specification — Mechanical Specification

Typical applications

Bus,tram,metro or railway system
Industrial control system
Semiconductor fabrication equipment
Factory automation
Electro-mechanical
Wireless network
Telecom or datacom system
Highly vibrotating,highly dusty, extremely low or high temperature harsh environment

Downloads

Certificates3

UL Certificate(RSD-500)(EN) PDF Download

CE Certificate(RSD-500)(EN) PDF Download

CB Certificate(RSD-500)(EN) PDF Download

FAQ

Can I use the RSD-500B-12 to run a 12V automation cabinet, DC motor control accessories, or industrial electronics from a 24V battery system?

This converter is designed for 12V constant-voltage output at up to 35A, with a total rating of 420W. Its continuous input range is 16.8-33.6V DC, so it is aimed at a 24V-class source rather than higher-voltage DC buses. It is suited to higher-current 12V loads within those limits.

Is the RSD-500B-12 appropriate for high-current 12V telecom, radio, or control equipment?

It can fit 12V equipment that needs substantially more current, because the output is rated for 35A and 420W. The load still has to be a constant-voltage 12V load within the 35A limit.

Can this converter handle 12V loads in transportation, marine, or heavy industrial environments?

The operating temperature range is -40C to +80C. The listed specs also include 5G vibration resistance, which supports use in equipment exposed to motion or vibration. Electrically, it is intended for 12V loads up to 35A and 420W.

Is the RSD-500B-12 suitable for outdoor equipment or exposed installations?

Its temperature rating of -40C to +80C supports demanding thermal conditions. However, no IP rating is provided in the specs, so outdoor exposure, washdown, or direct weather contact is not confirmed here. The data supports temperature capability, not enclosure sealing.

How does the RSD-500B-12 compare with the other high-power 12V and related RSD-500 models?

For the 500-series siblings listed here, RSD-500B-12 is 420W at 12V and 35A, RSD-500B-24 is 420W at 24V and 17.5A, and RSD-500B-48 is 422.4W at 48V and 8.8A. The related RSD-500C-12 is 420W at 12V and 35A, while RSD-500D-12 is also 420W at 12V and 35A. The 24V and 48V C and D variants increase to 460.8W or 499.2W depending on model, with corresponding current changes.

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