FNM-420-A-RD | Bosch Indoor Sounder LSN
Loop-powered addressable sounder with 32 synchronized tones
The Bosch FNM-420-A-RD indoor sounder is used for signaling an alarm acoustically directly at the fire location and is powered from the LSN improved loop. It offers 32 tone variants, including the DIN 33404-3 tone, each adjustable across up to 5 volume levels between 65 dB and 92 dB. Sounders on the same LSN loop with the same tone type are automatically synchronized. Two integrated isolators maintain loop function in the event of wire interruption or short circuit.
Brand: Bosch · Category: Notification Devices
Key features
- Loop-powered, no external supply
- 32 selectable tones
- Automatic tone synchronization
- Two built-in loop isolators
- Certified EN 54-3 sounds at maximum volume
Specifications
| Sound level | 65–92 dB (tone and volume dependent) |
|---|---|
| Tone variants | 32 (incl. DIN 33404-3) |
| Volume levels | Up to 5 |
| Power source | LSN improved loop |
| Isolators | Two integrated |
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