R900 – TU844 Redundant MTU Description Description R900 – TU844 Redundant MTU, 50V Used with redundant I/O. Horizontal DIN rail mounting. Shunt Stick not included. Related products ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE076940R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE081636R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE042257R1 Read more