The Kidde 438D-10N5 is a 10-inch vibrating fire alarm bell built for commercial and industrial notification circuits. At 88 dB at 10 feet, it delivers clear evacuation signaling on 120 VAC circuits with diode polarization for supervised NAC compatibility. Gray cast housing and alloy steel gong stand up to long service life in demanding environments.
Built for the commercial installer
Diode polarization lets this bell sit on a supervised NAC loop without false activations from supervisory current, and supports selective zone activation on multi-zone panels. The 120 VAC input connects directly to building power through the fire alarm panel's NAC output. UL listed, ULC listed (S218, S2202), FM approved, and MEA approved for broad code acceptance across jurisdictions.
Key features
- 88 dB at 10 feet (98 dB at 1m): clear audible notification for commercial spaces
- Diode polarized: compatible with supervised NAC circuits and multi-zone selective signaling
- Cast housing with alloy steel gong: durable construction for long-term commercial service
- Indoor or outdoor: add the Cat. No. 449 weatherproof back box for exterior installations
- Universal mounting: fits standard single-gang, 3-1/2" round, 4" octagon, and 4" square boxes
- Low current draw: 0.034 A at 120 VAC, maximizing appliance count per NAC circuit
Mounting requirements
Mounts on any standard single-gang opening, 3-1/2" round, 4" octagon, or 4" square electrical box for indoor use. For outdoor or weatherproof installations, use the Kidde Cat. No. 449 weatherproof wall box. Wall or ceiling mount orientation.
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Spec Sheet
