UL Photoelectric Smoke Detector


  • UL Listed. 
  • The standard detector is 2-wire or 3-wire with base.
  • For 4-wire type just add one relay output module on 3-wire base. Simple and easy module placement enables wider application.
  • Twin-color LED display enables viewer to easily identify the current status of detector.
  • Contacts material is highly acid-resistant and rust-resistant.
  • Detector is made of high endurance, solid and colorfast Fire-proof plastic.
  • Non-loosening screws on base terminal for easy installation.
  • Detector has passed strict EMC test, which greatly eliminates false alarms caused by interference from nearby sources.



AH-0621 UL Listed Photoelectric Smoke Detector

Model AH-0621-2 AH-0621-3 AH-0621-4
Alarm Contact N/A   N/A 0.8A @30V DC, 0.4A@125V AC
Voltage Range 12 ~ 30V DC
Alarm Current @24V DC 470Ω 50mA 59mA 45mA
Standby Current @24V DC 470Ω 140μA 25 ~ 75μA
Sensitivity Setting Comply to UL 268 
Ambient Temperature 0 ~ +37.8
Material Fire-proof plastic
Dimensions 102mm(Dia.) x 48mm(H)
Weight  130g  130g  145g
Color White

Effective Alert Area 

Building Height Area Covered
Under 4M 150 M2
4 ~ 20M 75 M2

Order Information

AH-0621-2 2-wire 
AH-0621-3 3-wire with remote indicator output
AH-0621-4 4-wire with relay output