Square D offers a line of instrument current and voltage transformers that are used for measurement and control of distribution equipment. There are 5 different current transformer configuration which are General Purpose Round, Toridal, Bushing, Rectangular, and Split Core configurations. There are also 3 different type of voltage transformers which have varying levels of accuracy for different applications. This product is current transformer with a current rating ratio of 50 to 5 with a window size of 1 and 1/8 inch with a rated power of 1 VA. This transformer is NEMA 1 degree of protection and is UL, CA and ANSI certified.