device: 7SL87 differential/distance protection, 1 /3-pole dual-end fault protection, expandable housing type: flush mounting; BI: 7; BO: 14 (6ST + 8F + 0HS + 0P ); 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: 1/2 x 19''; modules in 19" row 1: IO 208, PS201, PS204; modules in 19" row 2: ; LEDs/push-buttons: 32 LEDs; operation panel: integrated; key switch: with; display type: large display; front design: standard; auxiliary voltage: 60 V - 250 V DC, 100 V - 230 V AC;