Module of extension of 8 zones, connected by bus of 4 threads, totally supervised. Normally closed circuit, with final resistance of line, or double final resistance of line. Compatible for the range of head offices Power PC1616, PC1864 and for the cards of network IP TL-250 and TL-300. Certificate EN50131, Degree 2 and Class the IInd. Dimensions: 45 x 92 mm.