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An ACA P-50 courtesy airraidsirens.com.

The ACA Penetrator-50 or T-135 AC is one of the largest and loudest civil defense sirens in the world. 

History Edit

The P-50 was introduced in the 1980's until 1992 at that time it was largest siren in the world. It is still one of the loudest sirens in the world; at 135 db. The vent that houses the chopper is large enough for an average sized man to stand inside. It is a dual toned siren with 8/12 ports. The New T-135 replaced it and is more efficient for it has battery backup as the ACA was not. After ACA went bankrupt American Signal Corporation continued the P-50. It was know as the T-135 AC and was made from 1992-2006. The Cyclone was the same thing as the P-50 but it was the non rotating version. The P-50 is almost 1 ton!What does ACA stand for? ACA stands for Alerting Communicators of America

Cities with these sirens Edit

Paris, Wisconsin Milwaukee, Kenosha, Rib Mountain T-135AC, Hudson T-135AC Add any more here.

Illinois Chicago, Bartlett, Joilet, Lisle, Plainfield, Somers,Add any more here.

Feel free to add any more.

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