The Multilin UR-6EH Digital I/O Input Output Module serves to provide contact inputs or contact outputs to universal relays in the Universal Relay UR Series. These input and output contacts are useful to a Multilin universal relay in order to control and monitor equipment that are found within a substation or within equipment that handle protective functions. Each digital I/O can be differentiated from other Multilin I/O digital models with the type of protection card that is incorporated in to the module. These cards can be classified as Form-A, Form-C, SSR (solid state relay), or fast Form-C. The General Electric Multilin UR-6EH Digital I/O Input Output Module is characterized with a 6E order code. This alphanumeric designation is found after the “UR-” which stands for universal relay. These different I/O digital options allow the universal relay to be appropriate to each need, no matter how demanding. The 6E order code for the General Electric Multilin UR-6EH Digital I/O Input Output Module shows that the I/O module has four Form-C outputs and 8 digital inputs for use in the UR Series of Mutilin universal relays.