STH-10 Siren

History

The STH-10 was an outdoor warning siren made by Federal Sign & Signal in 1955. It was a part of the "T" class of sirens. It was originally designed as an improved version of the STL-10 civil defense siren. It's original intention was to be used as an updated fire siren, and not civil defense, although many cities bought STH-10s for many other purposes. During the late 1950's, a coded version called the STH-C was made. This could sound a pulsed/coded firecall for fire departments. The STH-10 came in single phase 7.5 HP, and three phase 10 HP. During it's later years in production, a 7.5 HP three phase version was made. It had a more racous tone than the older models built. The STH-10 was discontinued around 2006, and replaced with the Eclipse-8 outdoor warning siren.

Popularity

The STH-10 was a very popular siren throughout the eastern to midwestern United States. Due to the siren's efficient design and good sound coverage, a lot of smaller towns and some cities have kept their STH-10s instead of replacing them with newer sirens.