Mean Well MDR-40-12 is a 40W DIN rail switching power supply delivering a regulated 12V DC output. It is designed for industrial automation systems, PLC controllers, sensors and other equipment installed in control cabinets.

The unit supports a universal input range of 85–264VAC or 120–370VDC and provides efficiency up to 85%. Cooling is achieved by free air convection, ensuring silent and reliable operation.

Key Specifications

• Output voltage: 12V DC

• Rated current: 3.33A

• Rated power: 40W

• Adjustable output range: 12–15V

• Ripple & noise: 120mVp-p

• Frequency range: 47–63Hz

Protections

• Short circuit protection

• Overload protection 105–150% (constant current limiting)

• Over voltage protection 15.6–18V

Features

• DC OK relay contact for power status monitoring

• LED indicator for power on

• Low no-load power consumption <0.75W

Environmental Conditions

• Operating temperature: -20°C to +70°C

• Humidity: 20–90% RH non-condensing

• Mounting: DIN rail TS-35/7.5 or TS-35/15

• Dimensions: 40 × 90 × 100 mm

• Weight: approx. 0.3 kg

Ingress protection: IP20

Applications

• industrial automation

• control systems

• PLC controllers

• sensors and I/O modules

• control cabinets

Warranty: 3 years