Mean Well LOP-400-12 400W 5"×3" Low Profile Open Frame Power Supply 12V

The LOP-400-12 is a 12V open frame AC-DC power supply designed for OEM equipment that needs high output power in a compact footprint. Its approvals across ITE, medical, household, and industrial standards make it a strong fit for embedded equipment, control systems, and other enclosed professional devices that require a low-profile internal power solution.

This model is rated for up to 400W total output at 12V with a rated current of 20.8A when used with 23CFM forced-air cooling. For convection-cooled operation, the product description specifies 250W. It also supports 150% peak load for 3 seconds for short transient demand.

Yes. The LOP-400-12 uses a compact 5 x 3 inch form factor and has a low 27.5mm profile, with overall dimensions of 127 x 76.2 x 27.5mm. That makes it useful for equipment designs where board area and vertical clearance both matter.

The LOP-400-12 is specified for a wide operating temperature range of -40 to +80 degrees C, subject to derating. It is also rated for operating altitudes up to 5000 meters. Those specifications make it suitable for demanding industrial and enclosed equipment environments where standard commercial supplies may be more limited.

This model includes IEC60601-1 related approvals, extremely low leakage current, and 2 x MOPP, and the description states it is suitable for BF medical applications. It also meets IEC/EN/UL 62368-1 and IEC/EN61558-2-16 requirements for 12V SELV or ES1 output. Buyers should still confirm the full end-equipment compliance requirements for the final device.

The LOP-400-12 includes short circuit, overload, overvoltage, and overtemperature protection. It also features active PFC, no-load power consumption below 0.5W, and efficiency up to 95%. These characteristics help support reliable operation in high-duty OEM applications.