Thunderbolt Siren Series

The Thunderbolt siren was a supercharged electromechanical siren produced by Federal Electric, which later became known as Federal Sign & Signal and Federal Signal. The Thunderbolt has seven chopper levels, or voltage settings, that allow the pitch to be adjusted on the chopper, the Thunderbolt can come in three port ratios, 5 Port, 4/5 Port, and 5/6 Port.

Thunderbolt 1000

The Thunderbolt 1000 is a Single-tone supercharged siren that is part of the Thunderbolt Siren series. The Thunderbolt 1000 has a chopper that contains 5 ports.

Thunderbolt 1000T

The Thunderbolt 1000T is a dual-toned siren that is part of the Thunderbolt series, the 1000T can come in two port ratios, 4/5 (Major 3rd) and 5/6 (Minor 3rd).

Thunderbolt 1003

The Thunderbolt 1003 uses two solenoids that are attached to the upper portion of the siren to create a third, high-low signal, which can be used as a fire signal.