device for security fence, with assembly, calibration and tamper detection system with visual and audible alert for effective detection of tampering or alteration in the protective fence system, electrified or not. for this, a base device (1a) with a printed circuit board (p) connected to a pair of switches (6) and (7) with actuating rods facing along a spring blade (8) in "v", in whose spacer (10) with nut and counter nut set (12) is connected by male-female connectors to intermediate device units (1b) and upper device (1c), which are introduced in several units in one primary rod (14) exposing its nuts and on-lock nuts (12) where the ends of corresponding wires are tied (f), extended through the secondary rods (15) until fixed on the terminal rod (16), when calibration is performed, with the intention of spring blade (8) of its respective device (1a), (1b) or (1c), keeping the switch actuator stem (6) pressed against its trigger button and the switch actuator stem (7) away from its trigger button , indicating normal system calibration situation by the led (l). the free end of each wire (f) can be connected to an electrifier (e). when the wires are intentionally displaced (f), the spacer (10) of the laminar segment (8a) of the spring blade is pulled, activating the switch actuator button (6). when cutting the wire (f), the laminar segment (8a) returns, activating the switch (7), changing the color of the led (l) and activating the alarm.dispositivo para cerca de segurança, com sistema de montagem, calibragem e detecção de violação com alerta visual e sonoro para detecção efetiva de violação ou alteração em sistema de cerca de proteção, eletrificada ou não. para tanto um dispositivo base (1a) com placa de circui to impresso (p) ligada a um par comutadores (6) e (7) com hastes atuadoras faceadas ao longo de uma lâmina-mola (8) em ?v?, em cuja extremidade é fixado espaçador (10) dotado de jogo de porca e contra-porca (12) é interligado por conectores macho-fêmea a uni
