CSL Lighting T-125 Magnetic 300W 24-Volt Toroidal Transformer has a maximum of a 60-Feet run from the first socket. Magnetic transformers are typically larger and weigh more than an electronic transformer, but magnetic transformers are better for longer runs than electronic transformers. All of CSL Lightings magnetic transformers may be loaded up to 100-percent when mounted horizontally, and has four multi-taps (24, 26, 28, and 30). It has an auto reset in-line primary overload protection and an in-line secondary magnetic breaker to protect against short-circuit. Maximum watts per feed for a 24-Volt transformer is 600W. When the first lamp in the run is brighter than the lat lamp in the run, this difference is known as voltage drop. Voltage drop can be minimized by selecting the correct wire gauge between the remote transformer and the start of the run. To reduce voltage drop: Use a multi-tap transformer, use the correct gauge wire from transformer to the start of the run, and place the power feed in the center of the run. T-122 is 9.5-Inch wide by 6.25-Inch high by 4.75-Inch deep, and is UL rated for dry locations. T-122 comes one per package. CSL designs and manufactures performance-engineered architectural lighting fixtures. Our design and manufacturing teams are in Europe, Asia and the United States. Our products are developed to incorporate the latest lamping and electronic technologies into our fixtures to offer precision-engineered, highly-functional, energy-efficient and beautiful lighting. At CSL, we continue to lead the industry by offering amazing performance and design value in concealed linear lighting for Coves, Soffits and Undercabinet lighting. Our Invizilite, Mach 120, and Counter Attack series offers what may be the largest collection of halogen, xenon or fluorescent under-cabinet fixtures. Metal finishes including stainless steel, bronze and white are offered. Various cabling and switch options are available.