Voltalis echelon pcbA voltalis relays are designed to control current in a circuit. They are typically used for switching on and off electrical appliances, such as lights, motors, etc. The relays are connected to a printed circuit board (PCB) and are used to control the current flow. The PCB has several components, such as resistors, capacitors, transistors, diodes, and other electronic parts. The voltalis relay is connected to the PCB via a set of pins that are connected to the different components of the circuit relay is then used to control the current flow by switching the pins open or closed.