ACA Allertor 125

Intro The Allertor 125 is a rotational, electromechanical civil defense siren that was produced by Alerting Communicators of America from 1968 until it was replaced by the similar Penetrator series in 1980. Replacing the BNCO Mobil Directo upon its introduction, it competed with Federal Signal's Thunderbolt and 500 series of sirens as a high-power outdoor warning siren. Introduced in 1968 alongside ACA's other 1st generation sirens, the Allertor 125 was the direct successor to Biersach and Niedermeyer (B&N)'s Mobil Directo siren, with significant improvements to the design which simplified manufacturing and enhanced the siren's durability and performance versus its predecessor. Rather than using all-metal construction like its predecessor, ACA used then-brand-new fiberglass construction on the Allertor, which greatly improves the siren's longevity and durability as it prevented corrosion and better protected the siren's internals. 1st and 2nd generation models used steel panels for the lower half of the motor cover before switching to using fiberglass on all external parts for the 3rd generation.