Electromechanical horn S90

Sound for greater safety: Signal horns are required in vehicles by law so that other road users can be made aware of dangerous situations in a clearly audible manner. With its full sound, the HELLA S90 horn is particularly suitable for commercial vehicles. It generates maximum attention with its high sound pressure level.


The S90 horn is operated by the battery current or a control current coming from the steering wheel. This is passed through a relay to generate a voltage dip-free control current. The control current activates the electromagnet of the signal horn. This in turn attracts a metal core or armature, and above it, the steel diaphragm of the horn. The sound is produced by interrupting the power supply when the diaphragm is tightened and the armature and diaphragm return to the original position.


The HELLA S90 horn is available with a low (350 Hz) and a high (415 Hz) tone. The horn produces a sound pressure level of approx. 113 dB(A) at 2 m distance.

Product Advantages

  • Fully shaped oscillator for optimal sound propagation
  • Optimal ratio of size and performance
  • Slim matt black design with a red membrane

Technical Data

Diameter 90 mm
Operating voltage


Current consumption 3.5 max.
Power consumption

42 W

Operating temperature -40 °C to +90 °C
Protection class


Type approval ECE R28
Housing material

CRCS class EDD

Frequency range

350 Hz (high tone)
415 Hz (low tone)

Sound pressure level 113 dB (A)
Lifetime 50,000 cycles

Program Overview

Variant Part number Packaging unit
12 V, 415 Hz, high tone, 6.3 mm,
flat connector
3AM 922 200-617 40
12 V, 350 Hz, low tone,
3AM 922 200-761 1
12 V, 350 Hz, low tone,
3AM 922 200-767 40