SuperDuct Four-Wire Duct Detector Sensor Only, Terminals
Kidde Commercial

SuperDuct Four-Wire Duct Detector Sensor Only, Terminals

SKU KD-SD-ST

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The SD-ST is the sensor half of a SuperDuct four-wire duct smoke detection setup, wired with screw terminals for jobs where the installer prefers hard-wired connections over RJ45 harnesses.

Built for the commercial fire installer

Pairs with an SD-CT terminal-wired controller (one controller supports up to two sensors), and can mount in tandem with the controller or remotely, connected by standard field wiring instead of a factory harness. Patented differential sensing checks the environment every eight minutes and automatically compensates for dirt and humidity, cutting the sensitivity drift that drives nuisance duct alarms on other detectors.

Key features

  • Sensor only - pairs with an SD-CT terminal-wired controller
  • Terminal wiring for hard-wired field connections
  • Self-compensating sensing: checks for dirt and humidity every 8 minutes and adjusts automatically
  • Magnet-activated test/dirty/reset - works through the closed clear cover

System requirements

Requires an SD-CT controller (sold separately). Order an air sampling tube separately to match duct size (exhaust tube included).

Specifications

SKUKD-SD-ST
BrandKidde Commercial
Form factorDuct detector sensor only (terminals), pairs with SD-CT controller
Detection methodPhotoelectric, with differential environmental compensation
Compatible controllerSD-CT (sold separately, supports up to two sensors)
Sensitivity0.67 to 2.46% obscuration/ft
Operating temp-4°F to 158°F (-20°C to 70°C)
Wiring distanceSensor to controller: 100 ft max
ComplianceUL, ULC, CSFM, FM, MEA

Documents and resources

FAQs

Does this include a controller?
No. The SD-ST is the sensor only; order an SD-CT terminal-wired controller separately.
How is the detector tested?
With the built-in magnet-activated test/dirty/reset switch, without opening the detector cover.
Can this mount remotely from the controller?
Yes, using standard field wiring up to 100 ft from the SD-CT controller.
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