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2024-03-21
Electromechanical horn M28
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 M28 horn is particularly suitable for commercial vehicles. It is a durable, compact, lightweight horn. Its high sound pressure level generates maximum attention.
The M28 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 M28 horn is available with a low (340 Hz) and a high (415 Hz) tone and produces a sound pressure level of up to 118 dB(A) at 2 m distance.
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 M28 horn is particularly suitable for commercial vehicles. It is a durable, compact, lightweight horn. Its high sound pressure level generates maximum attention.
The M28 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 M28 horn is available with a low (340 Hz) and a high (415 Hz) tone and produces a sound pressure level of up to 118 dB(A) at 2 m distance.
The electromechanical horn M28.
Technical drawing of the electromechanical horn M28.
Technical Data
| Diameter | 80 mm |
| Rated voltage |
12 V |
| Sound pressure level at 2 m distance | 105 – 118 dB (A) |
| Frequency range |
340 Hz ± 20 Hz (low tone) 415 Hz ± 20 Hz (high tone) |
| Power consumption |
60 W |
| Current consumption |
Max. 3.5 A |
| Operating temperature | -40 °C to +80 °C |
| Protection class |
IP 67 |
| Lifetime | 500,000 cycles |
| Housing material |
Metal |
| Type approval |
ECE-R28 (lifetime) ECE-R10 (EMC) |
Program Overview
| Variant | Diameter | Part number | Packaging unit |
|---|---|---|---|
| 12 V, 335 Hz ± 20 Hz, low tone, flat connector | 80 mm | 3AL 007 425-427 | 32 |
| 12 V, 400 Hz, high tone, flat connector | 80 mm | 3AL 007 425-791 | 1 |