• Output Power: 402.3 W (with 23CFM Fan) / 251.1 W (Convection)
• Output Voltage: 27 V DC
• Output Current: 14.9 A (with 23CFM Fan) / 9.3 A (Convection)
• Input Voltage Range: 80 – 264 V AC / 113 – 370 V DC, 47 – 63 Hz
• Efficiency: up to 95%
• Ripple & Noise: 150 mVp-p
• Inrush Current: 40 A @ 115 VAC / 80 A @ 230 VAC
• No-load Power Consumption: 0.5 W
• Operating Temperature: −40 °C to +80 °C
• Cooling: Free air convection or forced-cooled with external fan
• Protection Functions: Short circuit, Overload, Over voltage, Over temperature
• Over Voltage Category: OVC III
• Isolation Voltage: 4000 V AC between Input and Output
• Dimensions (L x W x H): 127 mm x 76.2 mm x 27.5 mm
• Weight: 0.39 Kg
• Safety & EMC Certificates: CB, TUV, UL, CCC, RCM, EAC, CE
• LED Indicator: Power On Indicator
• Manufacturer Warranty: 3 Years

Information about the MEAN WELL LOP-400-27

The MEAN WELL LOP-400-27 is a highly efficient 400W low-profile open frame power supply, specifically engineered to provide a stable 27V output within a compact 5" x 3" footprint. With an ultra-slim height of only 27.5mm, it is an ideal choice for 1U chassis applications and high-density electronic systems where vertical space is a major constraint. The unit supports both Class I and Class II installations and features Over Voltage Category III (OVC III) compliance, ensuring superior safety and reduced installation costs when connecting directly to the building's main electrical distribution.

A key strength of the LOP-400-27 lies in its multi-field safety certifications, which bridge the gap between Medical (2xMOPP), Industrial, and Household standards. Its extremely low leakage current of less than 70µA makes it perfectly suited for BF-rated medical equipment, while its ability to deliver 251.1W under natural convection—and up to 402.3W with forced-air cooling—provides massive thermal flexibility. Equipped with a 150% peak load capacity for up to 3 seconds, a 12V auxiliary fan output, and Remote Sense functionality, this power supply delivers the reliability and technical sophistication required for advanced telecommunications and industrial automation.