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.

Product Advantages

  • Penetrating long-range alarm sound
  • White noise technology that reduces noise pollution (BM20)
  • Insulated electronics with epoxy resin to protect against rust, moisture, and vibrations
  • Various sound pressure level options for city traffic and construction sites

Technical Data

Rated voltage

12 – 32 V

12 – 48 V (3SL 996 139-277)

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 0.6 A (3SL 996 139-277)

Operating temperature -40 °C to +85 °C
Degree of protection

BM20: IP 6K7

BM40: IP 65

Lifetime 100 h
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 996 139-511 1
White noise, 140 mm cable with DEUTSCH connector 92 – 102 dB(A) 3SL 996 139-531 1
       
BM40
White noise + Standard, 150 mm cable with DEUTSCH connector

Low: 92 dB(A)
Medium: 102 dB(A)
High: 107 dB(A)

3SL 996 139-561 1
Smart, 150 mm cable with DEUTSCH connector 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

Downloads