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2024-02-08
Backup and warning alarm BM20 and BM40
More safety when backing up: The HELLA BM20 and BM40 backup alarms can help prevent accidents in dangerous and unclear working and maneuvering situations, especially in commercial vehicles with limited visibility to the rear. The flush mounting of a backup alarm is required by law in some countries for such cases.
With their piercing warning tone, HELLA backup alarm systems ensure additional safety for all road users. The warning tone is generated when reverse gear is engaged. Road users are warned of the vehicle backing up in good time. The backup alarms are available in different volumes to meet the requirements of different working situations. For example, backup alarms with a volume of about 90 dB are usually used in city traffic and backup alarms with a volume of 100 dB are usually used on noisy construction sites. Just 3 dB more in volume is perceived as twice as loud by the human ear.
The HELLA backup alarms are extremely resistant and protected against moisture and vibrations due to the housing made of fiberglass-reinforced nylon and the electronics cast in epoxy resin.
More safety when backing up: The HELLA BM20 and BM40 backup alarms can help prevent accidents in dangerous and unclear working and maneuvering situations, especially in commercial vehicles with limited visibility to the rear. The flush mounting of a backup alarm is required by law in some countries for such cases.
With their piercing warning tone, HELLA backup alarm systems ensure additional safety for all road users. The warning tone is generated when reverse gear is engaged. Road users are warned of the vehicle backing up in good time. The backup alarms are available in different volumes to meet the requirements of different working situations. For example, backup alarms with a volume of about 90 dB are usually used in city traffic and backup alarms with a volume of 100 dB are usually used on noisy construction sites. Just 3 dB more in volume is perceived as twice as loud by the human ear.
The HELLA backup alarms are extremely resistant and protected against moisture and vibrations due to the housing made of fiberglass-reinforced nylon and the electronics cast in epoxy resin.
Backup alarm BM20.
Technical drawing of the backup and warning alarm BM20.
Backup alarm BM40.
Technical drawing BM40.
The top view of the backup and warning alarm BM40.
The side view of the backup and warning alarm BM40.
Technical Data
| Rated voltage |
12 – 32 V |
| Sound pressure level at 1.2 m | 87 – 112 dB (A) |
| Frequency range |
80 – 140 Hz 140 ± 200 Hz (-551 and -571) |
| Power consumption |
BM20: 12 W BM40: 18 W |
| Current consumption |
BM20: ≤ 1.5 A BM40: ≤ 1.6 A |
| Operating temperature | -40 °C to +85 °C |
| Degree of protection |
BM20: IP 6K7 BM40: IP 65 |
| Housing material |
BM20: PA66 + 15% GA BM40: PA60 |
| Type approval |
ECE-R10 and SAE J994 |
Program Overview
| Variant | Sound pressure level at 1.2 m | Part number | Packaging unit |
|---|---|---|---|
| BM20 | |||
| White noise, 140 mm cable with DEUTSCH connector | 92 dB(A) | 3SL 996 139-501 | 1 |
| White noise, 140 mm cable with DEUTSCH connector | 97 dB(A) | 3SL 996 139-511 | 1 |
| White noise, 140 mm cable with DEUTSCH connector | 102 dB(A) | 3SL 996 139-521 | 1 |
| White noise, 140 mm cable with DEUTSCH connector | 92 – 102 dB(A) | 3SL 996 139-531 | 1 |
| BM40 | |||
| Standard, 150 mm cable with DEUTSCH connector | Low: 97 dB(A) Medium: 107 dB(A) High: 112 dB(A) |
3SL 996 139-551 | 1 |
| White noise + Standard, 150 mm cable with DEUTSCH connector |
Low: 92 dB(A) |
3SL 996 139-561 | 1 |
| Smart, 150 mm cable with DEUTSCH connector | 92 – 112 dB(A) | 3SL 996 139-571 | 1 |
| Smart + White noise, 150 mm cable with DEUTSCH connector | 92 – 107 dB(A) | 3SL 996 139-581 | 1 |