Kidde 20SA10 Hardwired Smoke Detector 10-Year Backup
- Power Source: Corded Electric
- Sensor Type: Photoelectric
- Alarm: Smoke Detector
- Product Style: 9th Edition
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A dependable hardwired replacement for houses already wired for interconnected alarms. Not the right choice if you cannot access household wiring.
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ASIN: B0CX6BTBWLModel: 20SA10Category: Smoke Detectors & Fire Alarms
Overview
The Kidde 20SA10 is a hardwired smoke detector that runs on 120V household power with a sealed 10 year battery built in as backup, so it keeps working through a power outage without the chirping of a swapped 9 volt. It also interconnects with other Kidde alarms in the home.
Unlike Kidde's simple battery only units, the 20SA10 wires into the house's electrical system, which puts installation closer to an electrician's job than a quick swap. The payoff is that one alarm sensing smoke can trigger every connected unit in the house, and there is no separate battery to buy or replace for a decade.
- 120V AC power with sealed 10 year backup battery
- 85 dB alarm with red LED warning light
- Interconnect capability across connected Kidde alarms
- UL 217 10th Edition and FCC tested
Who it's for
Suited to homeowners replacing an existing hardwired alarm, or anyone wiring multiple interconnected alarms through a house. Renters and anyone without access to the home's wiring should look at a battery only model instead.
Pros and cons
- Hardwired power with 10 year battery backup
- No low battery chirps to chase down
- Interconnects with other Kidde alarms
- 10 year limited warranty
- Needs household AC wiring, not a plug and play install
- Interconnect benefit only applies once more than one unit is wired in
Performance notes
Power comes from the home's 120V circuit, with a built in 10 year battery that takes over during an outage, so the alarm never drops into a low battery chirp cycle.
Where it stands among smoke detectors & fire alarms
- #4 most-searched brand and model of the 33 smoke detectors & fire alarms lines we track (by search demand, not sales).
From the specs of the 45 smoke detectors & fire alarms we list; not a test result.
Specifications
| Brand | Kidde |
|---|---|
| Model | 20SA10 |
| Dimensions & fit | |
| Item Weight | 0.59 pounds |
| Item Dimensions D X W X H | 1.9 × 5 × 5 inches |
| Capacity & performance | |
| Upper Temperature Rating | 100 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Enclosure Material | Plastic |
| Color | White |
| Included components | |
| Unit Count | 1 |
| Warranty & support | |
| Manufacturer Warranty Description | 10-Year Limited Warranty |
| Other details | |
| Sensor Type | Photoelectric |
| Alarm | Smoke Detector |
| Product Style | 9th Edition |
| Number Of Items | 1 |
| Mfr Part Number | 21032863 |
| Builtin Media | Alarm, Mounting Hardware, User Guide |
| Item Type Name | Smoke Alarm |
| Operating Humidity | Up to 95% relative humidity (RH), non-condensing |
| Item Highlight | Wired Interconnect, No Battery Replacement Or Low Battery Chirps, LED Status Lights, Ideal For Homes & Apartments |
Closest rivals on specs
Frequently asked questions
Does the Kidde 20SA10 still work if the power goes out?
Yes, its built in 10 year battery takes over automatically during an outage.
Can the 20SA10 be installed without an electrician?
It wires into 120V household power, so most homeowners have an electrician or someone familiar with home wiring handle installation.
Will one 20SA10 alarm trigger others in the house?
Only if it is interconnected with other compatible Kidde alarms; on its own it functions as a single hardwired unit.