The 450-00-50K part of the VRN Veritron is what’s known as the Variable Reluctance Network, or VRN. The part is an open type of transformer that is used to step up or step down AC voltages. It works by reading the changes in input secondary voltage, and uses these changes to control the output on the primary winding side. The VRN is often used for motor speed control or for power factor correction. It is rated for a voltage of up to 450-00-50K, allowing for use in a wide variety of applications.