DIN rail power supply 40W 12V 3.33A MDR-40-12

Compact DIN-rail mounting power supply

This MDR-40 series switching power supply from Mean Well is a reliable power source, ideal for applications in industrial automation, alarm systems, access control and many more. Its narrow housing saves space, and a wide input voltage range (85-264VAC or 120-370VDC) provides installation flexibility. The power supply is designed for mounting on a standard DIN TS35 rail, making it easy to integrate with existing systems.

Safety and functionality

The MDR-40-12 power supply is equipped with comprehensive protections, protecting both the unit itself and the devices connected to it. These include overload protection (OLP), short circuit protection (SCP), and overvoltage protection (OVP). Additionally, an LED indicator informs about the correct operation of the power supply. The DC OK (signaling) output allows for remote monitoring of the output voltage status. The device achieves an efficiency of up to 86%, which translates to energy savings.

This power supply is particularly useful where stable and reliable operation in harsh environmental conditions is required – the operating temperature ranges from -20°C to +70°C. Thanks to its compact dimensions (40 x 90 x 100 mm), it is easy to mount in distribution boxes and control cabinets. The MDR-40-12 model delivers 12V DC with a maximum output current of 3.33A and a power of 40W, making it suitable for a wide range of low-power devices. The no-load power consumption is very low – below 0.75W, which minimizes energy losses in standby mode.