The track mounted SC11 converts a controller's DC output signal of 4-20 MA or 0-10 V to a 0-20 V DC signal used to control selecta valves. Toggling between 4-20 MA or 0-10 V is achieved with an onboard 3-position dip switch: 4-20 MA - all positions on; 0-10 V - all positions off. made in United States. Manufactured by Maxtor company.