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The Federal Signal STH-10 was a single-tone 10-horsepower omnidirectional siren produced by Federal Signal over a span of 50 years. It proved to be one of the most popular of Federal Signal's omnidirectional sirens and gained a reputation as a reliable multipurpose siren.

The STH-10 was introduced in 1955 as a higher-pitched option to supplement Federal's existing 10HP STL-10 siren, using a 12-port rotor with 12 horns instead of the 7-port the STL-10 uses. The siren is very simple in design, being little more than the chopper, stator, motor, intake and horns. This very simple design meant that the siren was very reliable and easy to keep maintained, and the horns allowed it to reach 115db at 100 feet, 1db more than its lower-pitched brother. The siren ran on a 10HP motor located on top of the siren.

The STH-10 was designed as a multipurpose siren mainly for use at fire stations, as it had better range and volume than Federal's Model series. While it was mainly used as a fire siren, it easily doubled as a standard civil defense and weather siren when necessary. The STH-10 came in both single and three phase variants, the STH-10B and STH-10A respectively. The STH-10 became a popular siren, outselling the STL-10 significantly.

In 1995, the STH-10 was discontinued along with the STL-10 as part of restructuring, though the STH-10A would be reintroduced not long after, until it was discontinued in 2005 and replaced by the Eclipse-8 in Federal's lineup in 2006. The STH-10B was not reintroduced. Today, the STH-10 remains a common sight throughout the US and even Canada, often in use at volunteer fire stations as a fire siren, or as a tornado siren for smaller towns. As a result of its popularity vs the STL-10, the STH-10 can be found much more commonly than the STL-10.

See also:[]

Federal Signal STL-10

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