Manual call point ROP 21 exist in two versions: A type - direct operation (activation by pressing) B type - indirect action activation (activation by rising cover and pressing). This device is intended for  person who notice fire. By manual pressing, user gives information to the FAS control unit to activate fire alarm. This device can operate on detection loops or stub detection circuits controlled by the FAS alarm control unit only. By retchet mechanism, after activation, ROP 21 can be rearmed witout using any spare parts. The element has a double-sided short circuit isolator.