| 摘要 |
PURPOSE: A surge protection device for a security camera is provided to block a surge by installing a coil fuse in a ground line and a signal line of a coaxial cable of the security camera. CONSTITUTION: A first coil fuse(LF1) and a second coil fuse(LF2) are installed in a ground line(GND) and a signal line(S) of a coaxial cable. A gas arrestor tube(GAT) is connected in parallel to the front ends of the first and second coil fuses. A coil(L), first and second resistors, and first and second zener diodes(ZD1,ZD2) are serially connected. The coil, the first and second resistors, and the first and second zener diodes are installed between the signal line and the ground line in the rear ends of the first and second coil fuses in parallel.
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