Penetrator

The Penetrator series is a series of rotating sirens by Alerting Communicators of America that mainly consisted of 4 models: The P-10, P-15, PN-20, and the P-50.

Penetrator
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Company	Alerting Communicators of America, American Signal Corporation
Type	Electromechanical
Succeeded by	T-128 T-135 AC/DC

Penetrator-10

This model was the first to appear, slightly after the Allertor 125 and the short-lived ACA Howler, and was designed as the successor of the Allertor 125 to perfect the design faults the Allertor had. It uses the same 10 HP motor to drive the 9/12 port stator. This model can sometimes be differed from its look-alike twin, the P-15, by its intake cone. However it depends, because the dual tone P-15 shares the same intake cone as the P-10 does. The P-10 does not use the cylindric intake found on single tone P-15s. That is limited to the P-15 only.

Penetrator-15

This siren was nearly identical to its older brother, but is instead powered by a 15 HP motor. Some models have been equipped with dampers in the tube to create coded signals.

Penetrator-20

This type began as the problematic Performance+ Penatrator, made especially for Dane County, Wisconsin. The siren was intended to be 100% DC, but was never perfected, and thus the project was scrapped. The Penatrator-20 uses the 9 port rotor from the Screamer S5, and was attached

An inactive P-15 in Mechanicsburg, Pennsylvania.

Penetrator-50

The P-50, later known as the RM-135 and T-135-AC, was the biggest model of the Penetrator series, packing a massive 50HP motor pushing a sound output of 135dBc @ 100 feet. It is vastly different from it's smaller brothers sharing it's rotor and stator with the Cyclone. It holds the title of the world's loudest dual-tone siren as well as the loudest electric powered siren, and is to this day the loudest rotating directional siren in the world.

A P-50 in West Allis Wisconsin.