device: 7SL87 differential/distance protection, 1 /3-pole dual-end fault protection, expandable with standard version housing type: flush mounting; BI: 31; BO: 2 1 (11ST + 6F + 0HS + 4P); I: 3 (protection) + 1 (sensitive); U: 4 (standard); measuring transducer inputs: 0 (20 m A or 10 V, fast), 0 (20 m A, normal); housing width: 2/3 x 19''; modules in 19" row 1: IO 202, PS201, IO204, IO204; modules in 19" row 2: ; LEDs/push-buttons: 16 LEDs; operation panel: integrated; key switch: without; display type: small display; front design: standard; auxiliary(*)