This Marcus MTC100-39 control transformer is a reliable component for your electrical needs. It features a 100VA power rating and operates at 60Hz. Designed with 4 terminals for versatile connections, this transformer is built to Class B insulation standards. Please note that this model has been discontinued by the manufacturer, but a 2-year warranty is included.The Marcus MTC100-39 is a 100VA control transformer operating at 60Hz. It features Class B insulation and has 4 terminals. The product is discontinued by the manufacturer.