Simplex 4901-9820 — TrueAlert non-addressable electronic horn with switch-selectable free-run or SmartSync two-wire operation.
This low current 24 VDC horn can be driven straight from a conventional notification appliance circuit, or in SmartSync mode controlled separately from strobes sharing the same two-wire pair, so the horn can be silenced while the strobes keep flashing on one circuit.
- Rated 16 to 33 VDC; 21 mA at 16 VDC, 23 mA at 24 VDC, 27 mA at 33 VDC
- Steady output at 10 ft., UL 464 reverberant chamber: 86 dBA at 16 VDC, 89 at 24 VDC, 92 at 33 VDC
- Measured anechoic: 93, 96 and 96.3 dBA; coded output runs 3 to 4 dBA lower
- Output is a 2400 to 3700 Hz sweep modulated at a 120 Hz rate
- Red housing with white FIRE lettering; 5-1/8 in. H × 5 in. W × 1-1/2 in. D
- Mounts to a single gang, double gang or 4 in. square box; terminals 18 to 12 AWG
- UL listed to Standard 464 and ULC listed to S525; 32 to 122 °F
SmartSync control comes from 4006, 4007ES Hybrid, 4008, 4010, 4010ES and 4100U panels, from 4009 IDNet NAC extenders, or from the 4905-9938 control module. Do not confuse this with 4901-9822, which is steady output only, has no SmartSync mode and mounts only to a 4 in. square box.
