device: 7SL87 differential/distance protection, 1 /3-pole dual-end fault protection, expandable with standard version housing type: flush mounting; BI: 33; BO: 4 3 (29ST + 14F + 0HS + 0P); I: 8 (protection); U: 4 (standard); measuring transducer inputs: 0 (20 m A or 10 V, fast), 0 (20 m A, normal); housing width: 1 x 19''; modules in 19" row 1: IO 208, PS201, IO201, IO205, IO20 6, CB202; modules in 19" row 2: ; LEDs/push-buttons: 16 LEDs; operation panel: integrated; key switch: without; display type: small display; front design: USA; auxiliary volta(*)