EXSYS Mean Well MDR-40-24 DIN Rail Power Supply 24V DC 40.8W 1.7A 85-264V AC EX-6955

In industrial control cabinets, automation engineers often need a reliable 24V DC source that mounts directly onto a DIN rail without wasting panel space. The EXSYS Mean Well MDR-40-24 delivers exactly that: a compact 40.8-watt power supply that snaps onto TS-35/7.5 or TS-35/15 rails and converts a wide range of AC or DC inputs into stable 24V DC. Its slim plastic housing and free-air convection cooling make it suitable for tight enclosures where airflow is limited.

Key specifications

• Output: 24V DC, 1.7A, 40.8W
• Input: 85-264V AC or 120-370V DC (47-63 Hz)
• DIN rail mount: TS-35/7.5 or TS-35/15
• Efficiency: 88%
• Ripple & noise: 150 mVp-p
• Protection: short circuit, overload, over voltage
• Isolation: 3 kV AC input to output
• Operating temperature: -20 to +70 °C
• No-load power consumption: <0.5W
• Output voltage adjustable: 24-28V DC
• Certifications: UL 508, TUV EN60950-1, CB, CE
• Material: plastic housing

Why choose it

This power supply combines Mean Well's proven reliability with a wide input range that handles unstable mains or DC bus voltages. The adjustable output lets you compensate for voltage drop on long cable runs, and the built-in protections safeguard both the supply and connected equipment. Its compact size and DIN rail clip simplify installation and maintenance.

Ideal use cases

• Industrial automation and PLC systems
• Building control and HVAC panels
• Security and access control systems
• LED lighting and small motor drives
• Test and measurement equipment

Good to know

The MDR-40-24 uses free-air convection cooling, so no fan is required—this reduces noise and points of failure. It meets UL 508 and EN60950-1 safety standards, making it suitable for use in machinery and IT equipment. The output voltage can be adjusted from 24V to 28V DC via a built-in potentiometer.