Encapsulated medical power supplies have Class II input

TDK-Lambdavisit website


TDK Corporation is introducing the KMS-A series of single output, medically certified 15–60W encapsulated power supplies. With a Class II input, the products require no earth ground connection, making them suitable for use in a range of medical, dental and home healthcare. They are also suitable for broadcast, test & measurement and industrial equipment applications.

Comprising three power levels, 15W, 30W and 60W, the KMS-A is available in 5V, 9V, 12V, 15V and 24V output voltages. Off-load power draw is <0.1W for the KMS15A and KMS30A and <0.3W for the KMS60A with product efficiencies as high as 89 per cent. All models can operate from a wide range input voltage of 90–264V AC.

The KMS-A power supplies are suitable for board-mounting and are enclosed in UL 94V-0 rated resin cases. The 15W measures 52.5 × 27.5 × 23.5mm, the 30W 64.0 × 45.0 × 23.5mm, and the 60W 89.0 × 63.5 × 27.0mm. The products can operate convection cooled in ambient temperatures of -40degC to +85degC, with appropriate derating above 50degC, and have a maximum operating altitude of 5000m.

The series has been certified to UL/CSA/IEC/EN 60950-1, ANSI/AAMI ES60601-1, IEC/EN 60601-1 and carries the CE mark for the Low Voltage and RoHS2 Directives. TDK-Lambda’s medical safety compliance extends to providing 4kVac, 2 x MOPPs (Means of Patient Protection) input to output isolation and a touch current of <100uA at 264V AC. All models comply with EN 55011-B (conducted and radiated) emissions and EN 61000-4-2 immunity standards.

For more information about the full range of TDK-Lambda KMS-A series of pcb mount power supplies, please visit the TDK-Lambda website at

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