Serial Redundancy Switches with 24V DC Input Voltage are used to switch communication between primary / secondary master or between 2 Slaves based on a DI received from an external source. San Telequip Pvt. Ltd. Offers Serial Redundancy Switches with 24V DC Input Voltage. San Telequip Pvt. Ltd. Supplies a wide range of Interface Converters. Serial Redundancy Switches with 24V DC Input Voltage come with a power supply of 110V to 270V AC SMPS. The switching is done through 24V DC Digital Input signals, which are externally received, from a PLC or any such device. The 2 binary combinations of 2 DI`s like 0 & 1 select one of the 2 Inputs to be routed to the output.