Fire alarm system transmitter

A fire alarm system transmitter, comprising:

• a printed circuit board with a substantially rectangular shape;
• a terminal block disposed along one side of the printed circuit board, the terminal block including a plurality of terminals aligned along the one side of the printed circuit board;
• a casing with a substantially rectangular parallelepiped shape, the printed circuit board being connected and mounted substantially within the casing;
• and
• an electric-wire insertion portion provided on a side wall of the casing facing the one side of the printed circuit board, the electric-wire insertion portion being extended from the side wall of the casing by a predetermined distance only toward an outside of the casing, and not being extendable from the side wall toward an inside of the casing,
• wherein the electric-wire insertion portion defines a plurality of insertion holes which allow a plurality of electric wires, connected to the plurality of terminals, to be partitioned and inserted through the side wall, and
• wherein the plurality of terminals are substantially connected interiorly of the side wall, and
• the plurality of electric wires are extended to an inside of the casing, and end portions of the plurality of electric wires, from which insulating films are peeled off, are connected directly to the terminals,
• wherein the casing comprises a lower case having an opened upper surface and an upper case having an opened lower surface,
• wherein the electric-wire insertion portion comprises a lower guide extended toward the outside of the casing from a side wall of the lower case facing the one side, and an upper guide extended toward the outside of the casing from a side wall of the upper case facing the one side, and
• wherein a stepped portion for stopping mutual horizontal movement of the lower case and the upper case is provided at each of an upper end portion of side walls of the lower case and a lower end portion of side walls of the upper case.