SMCO600NV-AC — First Alert SC5 Wired Smart Smoke & Carbon Monoxide Alarm, a 120VAC hardwired combination smoke and CO alarm with voice alerts, hardwire interconnect and app connectivity.
The SC5 wired alarm is intended for single-family residences and is installed on a junction box using the supplied mounting bracket and a Quick-Connect power connector, so an existing compatible alarm can be swapped without rewiring. It must be fed from a 24-hour 120VAC pure sine wave 60Hz circuit that cannot be switched off by a switch, dimmer or GFCI. Battery back-up is shipped with a pull tab in place and is activated by removing that tab during installation. Voice alerts announce the type of danger and the programmed location, and the alarm reports to a phone through the First Alert by Resideo app.
Specifications
| Model |
SMCO600NV-AC (SC5 Wired) |
| Detection |
Combination smoke and carbon monoxide |
| Power source |
24-hour 120VAC pure sine wave 60Hz circuit, with battery back-up |
| Circuit restrictions |
Circuit must not be controlled by a switch, dimmer or ground fault circuit interrupter |
| Interconnect |
Hardwire, via orange interconnect wire on the power connector |
| Maximum interconnected units |
18 compatible units, of which a maximum of 12 may be smoke alarms |
| Maximum interconnect wire length |
Less than 1000 ft (300 m) total |
| Wireless frequency |
2.4GHz and 5GHz; 802.11 b/g/n/ac router recommended |
| End-of-life signal |
Audible signal approximately 10 years after installation |
| Mounting |
Mounting bracket with Quick-Connect power connector; ceiling or wall |
| Approved use |
Single-family residences; not designed for marine or RV use |
| Sensors | Photoelectric smoke; electrochemical CO |
| Battery backup | 3V lithium |
| Sound level | 85 dB at 10 feet |
| Dimensions | 5.75 in x 5.75 in x 1.6 in |
| Weight | 0.93 lb |
| Standard | Conforms to UL 217 10th Edition |
| Warranty | 10 Years Limited |
Installation notes
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Dedicated 24-hour circuit: the manual specifically requires a circuit that cannot be turned off by a switch, dimmer or GFCI. Feeding the alarm from a switched or GFCI-protected circuit may prevent it from providing constant protection.
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Pure sine wave only: AC-powered alarms should only be operated with true or pure sine wave inverters. Most battery-powered UPS units are not suitable.
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Orange wire is interconnect only: never connect the hot or neutral wires in the junction box to the orange interconnect wire. On a stand-alone install, tuck the orange wire into the junction box unused.
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Same breaker: all interconnected units must be powered from the same fuse or circuit breaker.
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Activate the back-up battery: remove the battery tab during installation, or the unit will not be protected during a power outage.
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Test individually: when testing an interconnected series, each unit must be tested separately and every unit must sound.
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Interconnect within one dwelling: interconnect only within a single-family residence, or all households will experience unwanted alarms during testing.
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Smart Interconnect: alarms without the Smart Interconnect feature will remain silent during a CO alarm, even when interconnected.
Related models
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SMCO600NV — the battery-powered SC5. It is powered by six 3V CR123A batteries and interconnects wirelessly through the app rather than over an orange interconnect wire; it has no AC connection and none of the hardwire interconnect limits above apply to it.
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SMICO100-AC, SC7010BV, SC9120B — earlier First Alert / BRK hardwired smoke and CO alarms listed as compatible for interconnection with this unit.
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SMI100-AC, SM100V-AC, 9120B, 7010B — compatible hardwired smoke-only alarms for the same interconnect series.
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HD6135FB — BRK heat alarm listed as compatible for interconnection.
Specifications taken from the First Alert / Resideo data sheet "SC5 Wired Smart Smoke & Carbon Monoxide Alarm SMCO600NV-AC Installation & Reference Manual," document M08-0669-000 Rev A (7/24). Manufacturer specifications are subject to change without notice.
Documents
FAQ
What power does the SC5 wired alarm need?
A 24-hour 120 VAC 60 Hz circuit that cannot be switched off by a switch, dimmer or GFCI, with battery backup.
How many alarms can be hardwire interconnected?
Up to 18 compatible units (maximum 12 smoke alarms) on the same fuse or breaker, with less than 1,000 ft of interconnect wire.
Can it replace a Nest Protect or an older First Alert alarm?
Yes. A legacy First Alert connector works with the SC5, and a separate power connector is included for replacing a Nest Protect.
When does it need replacing?
It gives an audible end-of-life signal about 10 years after installation.
