The frontal led point out: the presence of the power line and the counting (flashing). With Octal socket it is available with one (sch.815) or two (sch. 749) contacts.
TN80 can be mounted on panel (with socket AZ58) and wall (with socket AZ68 and retainer clips AZ81). The TN80 can be used as timer 48X48 with the mounting of the frontal reduction KIT3948.