WMA Series Low-Profile, High-Efficiency Medical Power Supplies

June 3, 2024
Cosel's wide range of low-profile power supplies for medical applications, the WMA series, has a universal input range of 85 to 264V AC and is available in 3 power levels: 35, 75, and 100 W.

COSEL launched a wide range of low-profile power supplies for medical applications.

The WMA series includes two families, the WMA-F and the WMA-H.

The WMA-F has a universal input range of 85 to 264V AC and is available in three power levels: 35, 75, and 100 W.

Designed for medical systems integration the WMA-H is available in two power levels: 150 and 350 W. It also has two ranges of input voltage that are selectable.

The series complies with international safety standards for medical applications and features an isolation grade of 2MOPP (IN/OUT) and 1MOPP (IN/FG). It uses the latest power-switching technologies and offers a good price/performance ratio.

The series is also suitable for demanding industrial fix applications requiring high isolation such as specified in Over Voltage Category III. The WMA-35-75-100F and WMA-150H are for convection cooling whilst the WMA-350H includes a fan for additional cooling and performance in demanding applications.

The WMA series has a height of 30 mm and achieves a high-efficiency level of up to 91% at high lines.

The series comprises 5 models that cover a power range from 35 to 350 W: 

  1. WMA35F
  2. WMA75F
  3. WMA100F
  4. WMA150H

The WMA35F is available in 4, single output voltages: 5, 12, 24, and 48V.

The WMA75F, WMA100F, and WMA150H are available in 3 single output voltages: 12, 24, and 48V.

The WMA350H is available in 4, single output voltages: 12, 24, 36, and 48V. Each model allows the output voltage to be trimmed using the built-in potentiometer.

The WMA-F series can be operated within a universal Input range of 85 to 264V AC. Designed for systems integration, the WMA-H can be operated in the range of 85 to 132V AC and 170 to 264V AC, switch selectable.

The series has inrush current limiting circuitry and overcurrent and overvoltage protection.

With its medical and industrial focus, the WMA series’ input to output isolation complies with 2MOPP, and its input to Frame Ground (FG) complies with 1MOPP. The units are approved in accordance with UL62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1), EN62368-1, ANSI/AAMI ES60601-1, C-UL (equivalent to CAN/CSA-C22.2 No.60601-1), EN60601-1 3rd, EN61558-2-16 (OVC III), and comply with IEC60601-1-2 4th Ed.

The WMA35-75-100F has no built-in active PFC though it complies fully with the IEC61000-3-2 (Class A). Designed for systems with integrated frontend PFC, depending on the final application the WMA150-350H may require external power factor correction circuitry.

EMI emissions comply with CISPR11-B, CISPR32-B, EN55011-B, EN55032-B, FCC Part 15-B, FCC Part 18-B and in EMC immunity with EN61000-4-2, 3, 4, 5, 6, 8, 11.

For strength and longevity, the WMA series is built on an aluminum chassis and enclosed in a hot-dip galvanized steel board (SGCC) case.

The combination of small size, excellent cost/performance ratio, and high quality make the WMA series the ideal power solution for demanding applications not only in the medical field but also for test and measurement and industrial applications including household and similar electrical appliances.

The WMA series has a 5-year warranty and conforms to the European RoHS and Low Voltage Directives.

The WMA series has also been designed for industrial applications such as semiconductors manufacturing equipment, complying with Semiconductor Processing Equipment Voltage Sag Immunity SEMI F47, and fix applications required to meet Over Voltage Category III.


  • For medical electric equipment (ANSI/AAMI ES60601-1, EN60601-1 3rd)
  • Medical Isolation Grade 2MOPP
  • 4kV isolation
  • Low-profile
  • Economical design
  • 5-year warranty

Price: Contact company about pricing


(W x H x D)
Weight Input Output Wattage Output Voltage
WMA35F 1 x 3 x 4 in.
(30 x 82 x 99 mm)
200 g
(7 oz.)
85 to 264V AC 35 W

5, 12, 24, 48V


1 x 4 x 4 in.
(30 x 97 x 99 mm)

250 g
(9 oz.)

85 to 264V AC 75 W

12, 24, 48V


1 x 4 x 5 in.
(30 x 97 x 129 mm)

300 g (10.5 oz.)

85 to 264V AC 100 W

12, 24, 48V


1 x 4 x 6 in.
(30 x 97 x 159 mm) 

500 g
(18 oz.)

85 to 132V AC,
170 to 264V AC
150 W

12, 24, 48V


4.5 x 1 x 8 in.
(115 x 30 x 215 mm)

800 g
(28 oz.)

85 to 132V AC,
170 to 264V AC
350 W

12, 24, 36, 48V

Cosel Co., Ltd.
San Jose, CA
[email protected]

Request More Information

By clicking above, I acknowledge and agree to Endeavor Business Media’s Terms of Service and to Endeavor Business Media's use of my contact information to communicate with me about offerings by Endeavor, its brands, affiliates and/or third-party partners, consistent with Endeavor's Privacy Policy. In addition, I understand that my personal information will be shared with any sponsor(s) of the resource, so they can contact me directly about their products or services. Please refer to the privacy policies of such sponsor(s) for more details on how your information will be used by them. You may unsubscribe at any time.