MEAN WELL RSD-30 Series 30W Reliable Railway DC-DC Converter

Product Overview

The RSD-30 series by MEAN WELL is a 30W enclosed type DC-DC reliable railway converter. It is compliant with BS EN/EN50155 and IEC60571 railway standards. This series offers three types of models with a 4:1 wide input range, catering to different input voltage requirements such as 9~36V, 18~72V, and 40~160V, making it suitable for various transportation systems that utilize standard input voltages like 12V, 24V, 36V, 48V, 72V, 96V, and 110V. It is available with output voltages of 3.3V, 5V, 12V, and 24V.

Key features include operation in harsh environments with high vibration, dust, and extreme temperatures (-40~+70°C), low ripple and noise, supreme EMC characteristics, 4KVDC I/O isolation, a low enclosure profile of 25mm, and semi-potted silicone for enhanced reliability. It is well-suited for in-car systems, railway facilities, trams, and buses.

Features

• Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standards
• 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°C wide working temperature
• Built-in constant current limiting circuit
• LED indicator for power on
• 3 years warranty

Applications

• Bus, tram, metro or railway system
• Wireless network
• Telecom or datacom system
• Harsh environments with high vibration, high dust, extremely low or high temperature

Specifications

Protection Features

• Overload Protection: Constant current limiting, recovers automatically after fault condition removal. Operates at 105~135% of rated output power.
• Over Voltage Protection: Shuts down output voltage, requires repowering to recover. Operates at 115~140% of rated output voltage.
• Input Reverse Polarity Protection: A MOSFET protects the unit if the input polarity is reversed.

Environmental and Safety Standards

• Working Temperature: -40~+70°C (with derating at higher temperatures)
• Storage Temperature: -40~+85°C
• Vibration: Complies with IEC61373
• Safety Standards: IEC 62368-1, UL 62368-1, AS/NZS 62368-1, EAC TP TC 004
• Withstand Voltage: 4KVDC I/P-O/P, 2.5KVDC I/P-FG, 2.5KVDC O/P-FG
• Isolation Resistance: 100M Ohms / 500VDC at 25°C, 70% RH
• EMC Emission: Complies with BS EN/EN55032 (Class A Conducted, Class B Radiated)
• EMC Immunity: Complies with BS EN/EN61000-4-2, -4-3, -4-4, -4-5, -4-6 standards
• Railway Standard Compliance: BS EN/EN45545-2 (fire protection), BS EN/EN50155, IEC60571 (shock & vibration), BS EN/EN50121-3-2 (EMC)

Installation and Operation

Installation: For detailed installation instructions, please refer to the MEAN WELL website: www.meanwell.com/manual.html. The unit can be installed in various orientations, and thermal performance is similar for different methods, sharing the same derating curve.

Parallel and Series Connection: The RSD-30 series does not have a built-in parallel circuit for current sharing, but redundant operation can be achieved using external circuits. Series operation is also possible by connecting the positive and negative terminals of the units.

LED Indicator: A green LED indicates normal operation. No light indicates no power or a failure.

Derating Curve: The derating curve shows the load capacity reduction based on ambient temperature and case temperature. For single unit operation without an iron plate, the maximum ambient temperature is 55°C at full load. Derating is required for temperatures between 55°C and 70°C.

Model Encoding

The model encoding follows the pattern: RSD-30[Input Voltage Range]-[Output Voltage].

• Input Voltage Range: G (9~36Vdc), L (18~72Vdc), H (40~160Vdc)
• Output Voltage: 3.3, 5, 12, 24 (Vdc)

Example: RSD-30G-5 represents a converter with a 9~36Vdc input range and a 5Vdc output.

Block Diagram

The block diagram illustrates the internal components of the RSD-30 series, including EMI filter, rectifiers, power switching, and detection circuits.

Input Fuse: A time-lag fuse is incorporated in the positive input line for surge protection. Specifications vary by model type (G, L, H).

Input Range and Transient Ability: The series supports a wide input range with ±40% tolerance for 1 second.

Input Under-Voltage Protection: The unit shuts down if the input voltage drops below a specified minimum (Vimin) and automatically recovers when the voltage returns above Vimin.

Inrush Current: Suppressed by a resistor during startup, then bypassed by a MOSFET to reduce power consumption.

Hold-up Time: Compliant with EN50155 standards for various input voltage ranges and load conditions.

Environmental Conditions and Testing

The RSD-30 series has undergone various environmental tests to ensure reliability:

• Cooling Test: Complies with EN 50155 TX level.
• Dry Heat Test: Complies with EN 50155 and EN 60068-2-2.
• Damp Heat Test, Cyclic: Complies with EN 50155 and EN 60068-2-30.
• Vibration Test: Complies with EN 50155 and EN 61373.
• Increased Vibration Test: Complies with EN 50155 and EN 61373.
• Shock Test: Complies with EN 50155 and EN 61373.
• Low Temperature Storage Test: Complies with EN 50155 and EN 60068-2-1.
• Salt Mist Test: Complies with EN 50155 (Class ST4).

EN45545-2 Fire Test Conditions: The series meets requirements for Oxygen index test, Glow-wire test, and Vertical flame test across Hazard Levels HL1, HL2, and HL3.

Mechanical Specifications

Dimensions: 113mm x 60mm x 25mm (L x W x H)

Weight: 0.25Kg

Input Terminal Pin Assignment:

• Pin 1: DC INPUT V+
• Pin 2: DC INPUT V-
• Pin 3: FG

Output Terminal Pin Assignment:

• Pin 1: DC OUTPUT -V
• Pin 2: DC OUTPUT +V

Additional Information

GTIN CODE: Available on the MEAN WELL website for search.

MTBF: Minimum 3093.5K hrs (Telcordia SR-332) / 396.9K hrs (MIL-HDBK-217F at 25°C).

Note: All parameters are measured at 24/48VDC input, rated load, and 25°C ambient temperature unless otherwise specified. For detailed product liability information, please visit: https://www.meanwell.com/service Disclaimer.aspx.