MEAN WELL SD-50B-12 DC-DC-converter 50,4W 12V 4,2A

Industrial automation engineers often need a reliable way to step down 24V DC battery or bus voltage to a stable 12V DC rail for sensors, controllers, and actuators. The MEAN WELL SD-50B-12 is a chassis-mount DC-DC converter that delivers 50.4W of regulated 12V DC output from a 19.2–36V DC input, making it a trusted choice in factory floors, vehicle systems, and remote equipment.

Key specifications

• Input voltage: 19.2–36V DC (nominal 24V DC)
• Output voltage: 12V DC
• Output current: 4.2A
• Rated power: 50.4W
• Efficiency: 80%
• Isolation voltage: 1500V DC
• Protections: short circuit, overload, over voltage
• Operating temperature: -10 to +60°C
• Cooling: free air convection
• Mounting: chassis mount with screw terminals
• Ripple & noise: 120mVp-p max
• Line regulation: ±0.5%
• Load regulation: ±1.0%
• Safety standards: UL60950-1, TUV EN60950-1
• EMC: EN55032 Class B, EN61000-4-2,3,4,5,6,8,11, EN55024
• Housing: metal case

Why choose it

This converter is built for demanding environments where space is limited and reliability is non-negotiable. Its metal case and convection cooling mean no fan noise or maintenance, while the wide input range tolerates voltage fluctuations from batteries or unregulated supplies. With full protection against short circuits, overloads, and over voltage, the SD-50B-12 keeps your 12V devices safe even under fault conditions.

Ideal use cases

• Powering 12V sensors and controllers from 24V industrial battery banks
• Stepping down vehicle DC voltage for onboard electronics
• Providing isolated 12V rails in automation panels and machinery
• Supplying stable power to LED lighting or small motors in mobile equipment

Good to know

The SD-50B-12 uses screw terminal connections for quick, secure wiring without special tools. It complies with international safety and EMC standards, so it can be integrated into equipment destined for global markets. For best results, mount it on a metal surface to aid heat dissipation and ensure adequate airflow around the unit.