DSC PTD1620U-CC High Efficiency Level 4 Plug-in Transformer, 16V 20VA

We use several suppliers for this product so it may or may not be the DSC brand.  It will be a 16.5VAC input with a 20VA that is specially designed for low voltage applications. The transformers are equipped with internal electrical overload protection and current fuses to meet UL requirements. This is typically used for alarm control panels.