
120V AC Wire-In Smoke Alarm 
For Basic Use
Part# 21006374   Model i12020 
 – Ionization Sensing Technology
– One button design (operates Smart Hush™ and test)
– Large mounting base
– Tamper resist feature
– Alarm memory
– Pre-stripped wiring harness with tinned strands
Description
The Kidde i12020 is an AC powered, ionization  
smoke alarm that operates on a 120V power source. 
This alarm uses ionization sensing technology. Ionization 
sensing alarms may detect invisible fire particles  
(associated with flaming fires) sooner than photoelectric 
alarms. Photoelectric sensing alarms may detect visible 
particles (associated with smoldering fires) sooner than 
ionization alarms. 
Kidde strongly recommends that both ionization 
and photoelectric smoke alarms be installed to help 
insure maximum detection of the various types of fire 
that can occur within the home.
The i12020 includes a quick connect wiring harness  
for easy installation. This unit is available in a 6-piece  
cut case with tray for easy display. The i12020 is a UL 
Listed product with a 10-year limited warranty.
Install Confidence:
Easy Installation
• Large mounting base makes mounting easier, protects 
surface paint from dirt and covers imperfections.
• Pre-stripped wiring harness with easy off cap does  
not require stripper tool. Tinned strands increase  
conductivity and wire nut grip.
Fewer Callbacks
• One button design for easy operation and less  
confusion. Operates Smart Hush™ and alarm test.
• Dust cover protects sensor from contaminates during 
construction reducing nuisance alarms.
User-Friendly Features
• Tamper resist locking feature deters alarm theft.
• Alarm memory flashes red LED indicating which unit 
was the initiating alarm in interconnected system.
• Interconnectable with up to 24 devices (of which 18  
can be initiating) including smoke, CO and heat alarms. 
See user’s guide for complete instructions.

120V AC Wire-In Smoke Alarm
FUSE OR CIRCUIT BREAKER
BLACK
WHITE
RED
L
N
First 
Alarm
Additional 
Alarms
For Basic Use
Part# 21006374  
Model i12020
Architectural and Engineering 
Specifications
The smoke alarm shall be Kidde model i12020 or approved equal.It shall 
be powered by a 120VAC, 60Hz source. The unit shall incorporate an ionization sensor with nominal sensitivity of 0.50 to .83%/ft. The temperature 
operation range shall be between 40˚F (4˚C) to 100˚F (38˚C) and the humidity operating range shall be 5% - 95% relative humidity.
The smoke alarm can be installed on any standard single gang electrical 
box, up to a 4” octagon junction box. The electrical connection (to the 
alarm) shall be made with a plug-in connector. A maximum of 24 Kidde 
devices can be interconnected in a multiple station arrangement. The 
interconnect system must not exceed the NFPA (National Fire Protection 
Association) limit of 18 initiating devices, of which 12 can be smoke alarms.  
With 18 initiating devices (Smoke, heat, CO, etc.), interconnected, it is still 
possible to interconnect 6 strobe lights and or relay modules. The alarm shall 
provide optional tamper resistance that deters removal of the unit from the 
wall or ceiling. 
The alarm shall include a piezoelectric horn that is rated at 85 decibels at 
10 feet. The unit shall include Smart Hush 
approximately 7 minutes if a nuisance condition occurs. The unit shall incorporate red and green LED indicators. The green LED (when illuminated) indicates 
the presence of AC power. The red LED (located under the TEST/Hush button) has four modes of operation:
Standby Condition: The red LED will flash every 30-40 seconds to indi-
cate that the smoke alarm is operating properly. Alarm Condition: When 
the alarm senses products of combustion and goes into alarm the red LED 
will flash one flash per second. The flashing LED and pulsating alarm will 
continue until the air is cleared.When units are interconnected, only the red 
LED of the alarm that senses the smoke or is being tested (the originating 
unit) will flash. All other units in the interconnected system will sound an 
alarm but their red LED’s will NOT flash. Alarm Memory: This smoke alarm  
is equipped with an alarm memory, which provides a visual indication when 
an alarm has been activated. The red LED will illuminate for about 1.5  
seconds every 16 seconds to indicate the memory condition. Smart Hush
Mode:  The red LED will illuminate for 1.5 seconds every 8 seconds,  
indicating the smoke alarm is in the Smart Hush
The unit shall at a minimum meet the requirements of UL217, NFPA72, 
(chapter 11), The State of California Fire Marshall, NFPA101 (One and two 
family dwellings), Federal Housing Authority (FHA, Housing and Urban 
Development (HUD).
TM
 feature that silences the unit for 
TM
 Mode. 
TM
Technical Specifications
Model:  i12020
UPC:  0-47871-40379-0
Power Source:  120VAC (
Sensor:  Ionization
Audio Alarm:  85dB at 10ft
Temperature Range: 40˚F (4.4˚C) to 100˚F (37.8˚C)
Humidity Range:  5%-95% relative humidity (RH)
Size:  5.6” in diameter x 1.55” depth
Weight:  .5lbs
Interconnects:  Up to 24 Kidde devices
LED:  Green, receiving ac power 
  Red, 4 modes of operation
Warranty:  10 year limited
80mA)
Installation of Smoke Alarm
The smoke alarm must be installed to comply with all local codes having jurisdiction in your area. All wiring shall be in accordance with articles 210 and 300.3(B) 
of the US National Electrical Code, ANSI / NFPA 70 and NFPA 72. The multiple 
station interconnect wiring must be in the same raceway as the AC power wiring. 
In addition the resistance if the interconnect wiring shall be a maximum of 10 
ohms. Make certain all alarms are wired to a single, continuous (non-switched) 
power line, which is not protected by a ground fault interrupter. A maximum of 
1000 ft. of wire can be used in the interconnect system. Use standard UL listed 
household wire as required by code.
Ordering Information
Ordering        Dimensions    Case/ Layers/  Skid 
Number  UPC  I2F5  Pack Quantity  (w x d x h inches) Weight Skid  Skid  Weight 
N/A  0-47871-40379-0  N/A  individual*  5.75 x 1.5 x 5.75 0.5 lbs N/A  N/A  N/A
21006374  0-47871-40379-0  100-47871-40379-7  Cut Case (6 units)  6.5 x 13.25 x 6  3 lbs  147  7  441 lbs
*Not for sale by individual unit
Distributed by:
1016 Corporate Park Drive 
Mebane NC 27302 
1-800-880-6788
www.Kidde.com
P/N: KL-i12020 sheet  rev. 01-2009