Mean Well MDR-40-12 AC-DC DIN Rail Power Supply

The Mean Well MDR-40-12 DIN-Rail power supply delivers a stable 12 V DC output at up to 3.3 A (39.6 W) from 85–264 VAC or 120–370 VDC input, making it a compact, single-output DIN rail solution for industrial automation. Mounted on DIN rails TS35/7.5 or TS35/15 and cooled by free-air convection, it fits compact control panels with a 40 × 90 × 100 mm footprint. Its output range is adjustable from 12 to 15 VDC and it includes protections for short circuit, overload, and over-voltage; a DC OK relay contact and a Power On LED provide clear status indicators. With typical efficiency of 84% and isolation of 3 kV, the MDR-40-12 is rated for -20°C to +70°C operation (derating applies) and suits applications in control panels, PLC systems, conveyors, packaging equipment, CNC machines, and other industrial automation setups requiring reliable 12 V power for sensors, relays, and field devices.