Tdk lambda single output low profile power supply open frame tdk lambda cus 250ld 4 the tdk lambda cus250ld 4 is a 42v 50a low profile ac dc power supply providing 165w of output power with convection cooling requiring no fans this design eliminates the need for fan maintenance and reduces acoustic noise and vibrations in addition it features a low profile of only 30mm and a compact footprint of 198 x 1016mm making it an ideal choice for applications in light industrial led signag