1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

1

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

1

Convection Cooled

Series 

Power 

Outputs Voltage 

Current 

Features 

Cooling

KAS4 

4W 

1 

3.3-24V 

Up to 1.2A 

PC  Mount -  Encapsulated 

Convection

KPSB 

5-25W  

1 

3.3-48V 

Up to 4A 

Low Profile Power Supplies 

Convection

KWSA 

5-25W 

1 

5-24V 

Up to 5A 

PC  Mount -  Encapsulated 

Convection

ZWS10-30B 

10-30W   

1 

3-24V 

Up to 2.5A 

Open Frame Power Supplies 

Convection

DRL 

10-100W  

1 

12-24V 

Up to 30A 

DIN Rail Mount - Low Profile 

Convection

KMS-A 

15-60W 

1 

5-24V 

Up to 20A 

Medica/ITE PC  Mount -  Encapsulated 

Convection

DRB 

15-480W 

1 

5-48V 

Up to 10A 

DIN Rail Mount - High Efficiency 

Convection

HWS15A-150A & HWS-/HD 15-150W 

1 

3.3-48V 

Up to 30A 

Limited Lifetime Warranty, Conformal Coated 

Convection

WMM30 

25-30W 

1 

5-24V 

Up to 5A 

Wall Mount Medical Power Supplies 

Convection

LS 

25-150W 

1 

3.3-48V 

Up to 40A 

Low Cost Enclosed Power Supplies 

Convection

CUSM 

30-600W 

1 

5-52.8V 

Up to 50A 

Open Frame/Enclosed Power Supplies  Convection/Forced air

HWS/ME 

30-150W  

1 

5-48V 

Up to 8A 

Limited Lifetime Warranty 

Convection

CUT 

35-75W  

2,3 

5-24V 

Up to 8A 

No Minimum load. +/- Outputs 

Convection

DT 

36-300W 

1 

5-54V 

Up to 25A 

Desktop Medical and ITE Power supplies 

Convection

CSW65 

40-65W  

1 

5-54V 

Up to 8A 

90-305VAC input, Class 2 on 24V model 

Convection

RWS-B 

50-150W  

1 

5-48V 

Up to 21A 

Enclosed Power Supplies 

Convection

CUS200LD 

79-120W  

1 

3.3-48V 

Up to 24A 

High Peak Power 

Convection

DRF120-960 

120-960W  

1 

24V 

Up to 40A 

DIN Rail Mount - Full Featured, High Efficiency 

Convection

GWS 

250W 

1 

11-57V 

Up to 21A 

Programmable Output Voltage 

Convection

EVS300 

300W 

1 

12-57V 

Up to 16.7A 

Constant Current - Ideal for Battery Charging 

Convection

CUS350MP-1000  350- 500W (1000W Peak)  1 

24-48V  Up to 41.7 PK 

High Peak Power Rating up to 1,000W 

Convection/Forced air

GXE600 

600W 

1 

24V, 48V  Up to 12.5A  Medical/ITE, Constant Current/Voltage - RS485 

Convection

TDK-Lambda’s broad selection of convection and conduction cooled power supplies are ideally suited for applications
that do not rely on fans for cooling. Eliminating fans reduces audible noise, possible mechanical fan failure, required
maintenance, and also increases system reliability.

Innovating Reliable Power

Conduction Cooled

Series 

Power Outputs Voltage  Current 

Features 

Cooling

CUS150M 

150W 

1 

12-48V 

Up to 12.5A 

Open Frame 2 x 4 

Conduction/Convention

CUS250M 

250W 

1 

12-52.8V 

Up to 20A 

Open Frame 2 x 4  

Conduction/Convection

PFE300SA/500F/1000FA 

300-1008W 

1 

9.6-57V 

Up to 60A 

Power Module - Harsh Environment 

Conduction

CUS400M 

250W 

1 

12-49.9V 

Up to 33.3A 

Open Frame 3 x 5, 400W peak  

Conduction/Convection

PF500A-360 

504-756W 

1 

360V 

Up to 2.1A 

Power Module - PFC 

Conduction

PFH500 

504W 

1 

9.6-52V 

Up to 10.5A  Power Module - Harsh Environment,  PMBus™  

Conduction

CPFE1000F 

720-1008W 

1 

9.7-57V 

Up to 60A 

MIL STD 461/462D CE102 EMC - i2C Interface 

Conduction

CPFE1000Fi 

720-1008W 

1 

9.7-57V 

Up to 60A 

Conformal Coating Option- i2C Interface 

Conduction

PF1500B-360 

1008-1512W  

1 

360V 

Up to 4.2A 

Power Module - PFC 

Conduction

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

2

Convection Cooled

Applications

Features

u

  Industrial

u

  Medical

u

  COTS

u

  Test

u

  Communication

u

  LED

u

  Broadcast

u

 Food and Beverage 

 

u

  Universal AC Input

u

  High Efficiency

u

  High Convection Ratings

u

  Medical & ITE Safety Approvals

Product Types

u

  Open Frame

u

  Chassis Mount

u

  PCB Mount

u

  DIN Rail

u

  External Desktop

u

  Wall Mount Adapters

Convection

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

3

KAS Series

2-4W Wide AC-DC Input PCB-Mount 

u 

90-305VAC input

u 

Class II (no ground needed)

u 

Wide temperature range -40 to +80°C

u 

Low off-load power consumption

u 

3 year warranty

KPSB Series

5 to 25W Board Mount

u 

In

dustrial Certifications 

 

 

u 

Class B EMI 

 

 

u 

Low Cost and Compact Size 

 

 

u 

Class II Input   

 

u 

Low no load power consumption 

 

 

u 

Wide operating temperature 

 

 

NEW

KWSA Series

5-25W Industrial AC-DC PCB-Mount 

u 

Small size and lightweight

u 

PC Board Mountable

u 

Wide Range Input

u 

Wide operating temperature range -40 to +85°C

u 

Class II (No ground needed)

u 

3 year warranty

ZW Series

10-300W  Single & Multiple Output

u 

85-265 universal input                                                                        

u 

Open frame 

u 

ZWQ 1U quad output models from 80-170W                                                                        

u 

ZWS-BP (150W, 240W) to be added (peak power 2x)

u 

3 to 5 year warranty

KMS & KMS-A Series

15-60W Medical AC-DC PCB-Mount

u 

Small size and lightweight

u 

PC Board Mountable

u 

Wide Range Input

u 

Medical Safety Certifications (4kVAC Input - Output)

u 

Class II (No ground needed)

 

DRL Series

10-100W Low Profile DIN Rail Mount

u 

Low p

rofile for building automation

u 

Class II double insulation

u 

ErP compliant, very low no load power consumption

u 

10W, 30W, 60W & 100W models

u 

3 year warranty

Convection Cooled

Full Datasheet

https://product.tdk.com/en/power/kas

Full Datasheet

https://product.tdk.com/en/power/kws-a

Full Datasheet

https://product.tdk.com/en/power/drl

Full Datasheet

https://product.tdk.com/en/power/kpsb

Full Datasheet

https://product.tdk.com/en/power/zwq

Full Datasheet

https://product.tdk.com/en/power/zws-bp

Full Datasheet

https://product.tdk.com/en/power/kms-a

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

4

Convection Cooled

CUS 30/60/100ME/

150/200M Series

30-250W Medical & ITE

u 

2 x 3”, 2 x 4” & 3 x 5” Footprints

u 

Low profile

u 

Class I & II for some models

u 

Suitable for B and BF Type Medical Equipment

u 

3 to 5 year warranty 

  

HWS-A & HWS-/HD Series

15-150W High Quality Industrial & Medical Power 

u 

Long Field Life

u 

Semi F47 Compliant (230VAC)

u 

Medical Certification (HWS/ME)

u 

Conformal Coating, -40°C Startup (HWS/HD)

u 

Limited Lifetime Warranty (click for terms and conditions)

DRB Series

15W to 480W High Efficiency DIN Rail Mount 

u 

Exc

ellent efficiency – up to 93%

u 

ErP compliant, very low no load power consumption

u 

Market leading case width

u 

Output voltages 5, 12-15, 24, 48VDC

u 

15W, 30W, 50W, 100W and 480W models

u 

3 year warranty

WMM Series

25-30W Wall Mount Adaptor / External 

u 

Medical

 Safety Certifications and Immunity 

 

 

u 

4kV (2xMOPP) Input to Output Isolation 

 

 

u 

Meets DoE Level VI and EU Tier 2 Efficiency   

 

u 

Class II, Wide Range Input 

 

 

 

u 

Alternative Connectors and Cable Assemblies   

 

u 

Low Cost and Compact Size

NEW

LS Series

25-150W, 3.3-48V, up to 30A, Low Cost

u 

Very low cost

u 

Small size

u 

115VAC or 230VAC input

u 

Withstands 300VAC surges (5s)

u 

3 year warranty

CUS350MP Series

 

200 to 350W/420W Medical & ITE

u 

High 

Efficiency, up to 94%

u 

Low profile

u 

Convection Cooled, and Forced Air Ratings

u 

5V Standby & 12V Fan Output

u 

3 year warranty

Full Datasheet

https://product.tdk.com/en/power/drb

Full Datasheet

https://product.tdk.com/en/power/wmm

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/hws-a

Full Datasheet

https://product.tdk.com/en/power/hws-hd

Full Datasheet

https://product.tdk.com/en/power/ls

Full Datasheet

https://product.tdk.com/en/power/cus350mp

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

5

CUS400M Series

400W Medical & ITE 3” x 5” AC-DC Power Supplies

u

 

250W (400W peak) Convection / Conduction Cooled

u

 Medical Certifications (2 x MOPP)

u

 Suitable for B and BF Type Medical Equipment

u

 Class B Conducted and Radiated EMI

u

 Suitable for Class I and Class II Installations

u

 Compact 3 x 5 x 1.55” Size

u

 Enclosure & Signal Options

CUS600M Series

600W 3” x 5” AC-DC Medical Power Supplies

u

 400W (600W Peak) Convection Cooled

u

 Medical Certifications (2 x MOPP)

u

 Suitable for B and BF Type Medical Equipment

u

 Class B Conducted and Radiated EMI

u

 Suitable for Class I and Class II Installations

u

 Compact 3 x 5 x 1.46” Size

u

 Enclosure & Other Options

NEW

NEW

Desktop DT Series

25W to 300W Adaptor / External power 

u 

EISA and CEC Compliant (most models)

u 

Compact package size

u 

Single Outputs up to 54V

u 

Medical or Industrial Certifications

u 

Energy Efficiency Level V & VI models

u 

3 year warranty

CSW Series

40-65W Wide AC-DC Input

u 

90 - 305VAC Input

u 

Convection Cooled

u 

U Channel or Enclosed 

u 

Class 2, 24V model approved to UL1310

u 

DIN Rail Mount option

u 

3 year warranty

CUT Series

 

35-75W Triple Output 

u 

1.06” high

u 

No minimum loads

u 

5V isolated from outputs 2 & 3

u 

Convection Cooled

u 

Optional cover and terminal type

u 

3 year warranty

RWS-B Series

50W to 600W Single Output Low Cost

u 

Cost 

Effective

u 

Wide Range AC Input

u 

Compact Size

u 

Enclosed, Convection Cooled 50-150W Models

u 

Fan cooled, 300 & 600W Models

u 

5 year warranty

Convection Cooled

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/cut

Full Datasheet

https://product.tdk.com/en/power/csw

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/dt-d

Full Datasheet

https://product.tdk.com/en/power/rws-b

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

6

CUS250M Series

250W Medical & ITE 2”4” AC-DC Power Supplies 

u 

Up to

 250W Convection/Conduction Cooled   

 

u 

Medical Certifications (2 x MOPP)   

 

u 

Suitable for B and BF Type Medical Equipment  

 

u 

Class B Conducted and Radiated EMI 

 

 

u 

Suitable for Class I and Class II Installations   

 

u 

Compact 2 x 4 x 1.56” Size

u 

Enclosure & Signal Options

NEW

CUS-LD Series

79 to 250W Single Output

u 

High 

Efficiency, up to 90%

u 

Low profile

u 

Wide Range AC Input

u 

Convection Cooled

u 

Coated PCB as standard on CUS250LD

u 

3 year warranty

DRF Series

120W to 480W High Efficiency DIN Rail Mount

u 

Ex

cellent efficiency – up to 94%

u 

Extremely narrow case

u 

Market leading no load power consumption

u 

ErP compliant, Remote On/Off, 24VDC output

u 

Droop Mode Current Share, 150% peak power for 4s

u 

5 year warranty

GWS Series

250W Single Output

u 

High

 Efficiency, up to 93%

u 

1.6” high (For 1U racking)

u 

Wide Range AC Input

u 

250W Convection Cooled

u 

5 year warranty

GXE600 Series

600W Single Output Programmable Medical and ITE Power Supplies

u

 Convection Cooled 

u

 Up to 95% Efficient 

u

 RS-485 Read-Write Communication (Modbus RTU protocol) 

u

 Constant Voltage & Constant Current Modes 

u

 Monitoring & Programming Functions 

u

 Digital or Analog Programming 

u

 7 year warranty 

NEW

EVS300 Series

300W Constant Current 

u 

Suitable for battery charging

u 

12-18V compliant voltage

u 

Adjustable current settings

u 

5 year warranty

Convection Cooled

Full Datasheet

https://product.tdk.com/en/power/cus-ld

Full Datasheet

https://product.tdk.com/en/power/gws

Full Datasheet

https://product.tdk.com/en/power/drf

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/evs

Full Datasheet

https://product.tdk.com/en/power/gxe

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

7

Understanding Convection Cooled Power Supplies

There are a number of commonly used terms to describe cooling methods in the power supply industry:

 

Fan cooled

 

Unit has an internal fan

 

Convection cooled

  Unit requires no fan cooling

 

Forced air cooled

 

Unit requires external airflow

 

Conduction cooled

  Unit relies on a cold plate to remove the waste heat

The most misunderstood and hence most misapplied is probably convection cooled.  Many Engineers assume that a 

convection cooled power supply is one that does not need any airflow to operate.

One definition of convection is “The transfer of heat by the circulation or movement of the heated parts of a liquid or 
gas”.  In our case – the circulation or movement of hot air.

Open frame power supplies, for example, are typically mounted on a flat surface upon standoffs, and  below we can 

see how the air behaves.

 

As the hot air rises, cooler air is drawn in from the sides.  Although the airspeed is quite low, just 0.3m/s, it is sufficient 
to reduce internal temperatures.  When the power supply goes through safety certification, this is taken into account 

during thermal testing.
  
It is very important to ensure that there is adequate space for the air to be drawn in from the sides and allowed to exit 
above the power supply.  A distance of 50mm is considered safe.

Cool Air

Cool Air

Power Supply

Hot Air

Convection Cooled

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

8

Orientation of the product is also very important.  Most manufacturers will state a recommended mounting orientation 
and any derating associated if that is not followed.  Mounting the product upside down for example can severely reduce 

field life unless heavy derating is applied, and is often forbidden.

The ramifications 

of mounting the power supply vertically should be studied.  Ideally the output electrolytic capacitors 

should be located at the bottom, where the temperature will be the coolest.

 

If in doubt, consult the manufacturer’s installation manual.  For high density products, recommended maximum compo-
nent temperatures will be advised for critical parts.

Hot Air

Hot Air

Cool Air

Power Supply

Hot Air

Cool Air

Power Supply

Convection Cooled

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

9

Conduction Cooled

Applications

Features

u

  Industrial

u

  COTS

u

  Test & Measurement

u

  Communication

u

  LED

u

  Broadcast 

 

u

 High Efficiency

u

  High Baseplate Operating Temperature

u

  i

2

C Interface (some models) 

u

  Protective PCB Coating (some models)

u

  Parallel Operation

 

Conduction

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

10

CUS400M Series

400W Medical 3” x 5” AC-DC Power Supplies

u

 400W with Forced Air, 250W (400W peak) Conduction / Convection Cooled

u

 Medical Certifications (2 x MOPP)

u

 Suitable for B and BF Type Medical Equipment

u

 Class B Conducted and Radiated EMI

u

 Suitable for Class I and Class II Installations

u

 Compact 3 x 5 x 1.55” Size

u

 Enclosure & Signal Options

PFE-SA & -FA Series

(Building Block)

300-1000W Full Brick AC-DC 

u 

Low profile, small size

u 

100°C baseplate temperature

u 

High power density, High Efficiency

u 

Parallel capabilities on 500-1000W

u 

Peripheral components required to make operational

  (reference design available)

u 

We offer value added services “brick on board,” See next pages.

PF1500A-360 Series

1008 to 1512W PFC Power Supplies

u

 Power Factor Corrected Module

u

 360VDC Output

u

 Ideal for Distributed Power Archetecture

u

 Provides High Voltage DC to PH AC/DC Products

u

 Parallel Capability

u

 Operates in Harsh Environments

CPFE1000FI Series

(Industrial use)

 

720-1000W Single Output Conduction Cooled

u 

Universal Input

u 

Smaller size than CPFE1000F

u 

Baseplate cooled, no fan required

u 

I2C Interface

u 

High Efficiency

u 

PCB assembly option

u 

Protective PCB coating option

u 

Parallel up to 6 units

u 

Radiated & Conducted Emissions: Class B conducted,

  Class A Radiated, EN55022/EN55011

CUS250M Series

250W Medical & ITE 2”4” AC-DC Power Supplies 

u 

Up to

 250W Convection/Conduction Cooled   

 

u 

Medical Certifications (2 x MOPP)   

 

u 

Suitable for B and BF Type Medical Equipment  

 

u 

Class B Conducted and Radiated EMI 

 

 

u 

Suitable for Class I and Class II Installations   

 

u 

Compact 2 x 4 x 1.56” Size

u 

Enclosure & Signal Options

PFH Series

(Building Block)

500W AC-DC Power Module

u 

Compact 4” x 2.4” x 0.53” brick package

u 

100°C Baseplate temperature

u 

PMBus

TM  

u 

Peripheral components required to make operational

  (reference design available)

u 

3 year warranty

NEW

NEW

Conduction Cooled

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/pfe

Full Datasheet

https://product.tdk.com/en/power/cus-m

Full Datasheet

https://product.tdk.com/en/power/pfh

Full Datasheet

https://product.tdk.com/en/power/pf-a

Full Datasheet

https://product.tdk.com/en/power/cpfe

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

11

Conduction Cooled

CPFE Series (MIL-COTS)

1000W Single Output Conduction Cooled

u 

Universal Input

u 

MIL STD 461/462D CE102 EMC

u 

Baseplate cooled, no fan required

u 

I2C Interface

u 

High Efficiency

u 

Parallel up to 6 units

u 

Radiated & Conducted Emissions: Class B and

  MIL STD 461/462D CE102

PF1500B Series

1008 to 1512W PFC Power Supplies

u

 Power Factor Corrected Module

u

 360VDC Output

u

 Ideal for Distributed Power Archetecture

u

 Provides High Voltage DC to PH AC/DC Products

u

 Parallel Capability

u

 Operates in Harsh Environments

https://product.tdk.com/en/power/pf-b

https://product.tdk.com/en/power/cpfe

NEW

Full Datasheet

Full Datasheet

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

12

PFE “Brick on Board” example

u

  

A customized power solution adding enhanced circuitry or packaging around a Standard/

  Existing TDK-Lambda Power Supply to meet customer’s specifications.

u

  

Any TDK-Lambda supply may be used as a starting point and these customized solutions also  

  retain the proven reliability of the product from which it was modified.  

u

  

Examples include custom racks or enclosures, communications/control, ruggedization, special  

  wire harnesses, switches, fuses, fans, heat sinks, and other additional functionality to a

  standard product.

Value-Added

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

13

Advantages of Conduction Cooled Power Supplies

Most mid to high-power supplies use fans to help dissipate the internal heat that is generated as a result of imperfect 

AC to DC conversion efficiencies.  Since fans are electromechanical devices, they reduce the system’s MTBF and add 

to the required maintenance expenses. 

The photo above is a power supply that operated for many years at a postal depot where mail is handled and sorted 
automatically.  As can be seen (after the fan was removed) paper fragments and airborne dust contaminants were 
pulled into the supply by the fan and eventually caused a blown fuse.  

As might be expected, the proper maintenance program for any fan-cooled power supply calls for the periodic inspec-
tions of the supply, with the fan removed, and the replacement of the fan with a new one.

A new breed of conduction-cooled power supplies has been developed that do not depend on fans for cooling.  Instead, 
the required cooling is accomplished by conducting the internal heat loads to an external metal structure or enclosure, 
which act as a large heat sink surface. 

Conduction Cooled

1-800-526-2324 • www.us.lambda.tdk.com

Revision 2A: March 2023

14

The photo above shows TDK-Lambda’s new CPFE1000FI series, which are conduction-cooled, 1,000 watt AC-DC 
power supplies.  All heat is conducted to the supply’s aluminum plate, which is designed to easily mount to a metal 

enclosure or cold plate for cooling.  More details and specifications for these power supplies are at this web link:
https://product.tdk.com/info/en/products/power/tec_data/ps_cpfe.html.

In some applications, these conduction-cooled devices are mounted to liquid cooled cold plates that are made of metal 
with internal serpentine channels through which a liquid circulates while removing the unwanted heat.  The net result 
is that the system operates with a substantial reduction in audible noise, reduced maintenance costs (no dust build-up 
and fan wear-out), and an enhanced MTBF.

A good example is a visit to a Television Broadcasting Station that consumes about 100 kilowatts of power.  At this
location, in separate areas, is a traditional fan-cooled installation in tandem with a modern latest generation system;

a system utilizing conduction-cooled power supplies & liquid cooled RF amplifiers (via cold flow plates). During operation 

of the traditional system (with fan cooling), audible noise is so loud that personnel within 100 feet have to wear hearing 
protection.

Advantages of Conduction Cooled Power Supplies

Conduction Cooled