Tdk lambda ls series enclosed power supply chassis mount tdk lambda ls75 48 the tdk lambda ls75 48 belongs to the manufacturers ls75 series of single output ac dc power supplies the tdk lambda is offered with a 3 year manufacturer warranty with a mtbf of 700000 hrs it offers superior reliability and its broad operating temperature range makes the ls75 48 suitable for installation in indooroutdoor enclosures at temperatures above 50degc the psu offers a lower derate with up to 70