The Hammond VCT49 is a volumetric chip-type transformer that is designed to provide low, medium and high speed impedance conversion. It is commonly used in CCTV and video applications, as well as other applications requiring impedance matching. The VCT49 consists of four components: a core, a pair of windings, and a pair of transformers. The core and windings are designed to provide low DCR, while the transformers provide low, medium and high speed impedance conversion. The VCT49 core is usually made of silicon steel or iron, and the windings are typically made of an insulated copper wire. The transformer is rated for an isolation voltage of 500V AC, with a maximum surge current of 25A. The Hammond VCT49 is a reliable and cost-effective way of providing impedance matching for many CCTV and other applications.