Four-wire Duct Smoke Detector SD-4W

Manufacture: kidde
Product code: SD-4W

Kidde SuperDuct smoke detectors ⭐
✅ are the most advanced and most reliable devices in their class. Designed for easy installation and superb reliability ⭐
✅ SuperDuct represents the perfect balance of practical design and advanced technology.


Consulting hotline: 0944934114
Product information

Reliability and stability are two features built every SuperDuct detector. SuperDuct features environmental compensation with patented differential sensing. This achieves a level of stability and reliability never before achieved for devices of this type. With differential sensing, SuperDuct sensors are immune sensitivity drift – a common cause of false alarms. Every eight minutes the SuperDuct sensor checks its environment for dirt, humidity other conditions that normally interfere with sensor operation, and automatically adjusts its sensitivity to compensate. The result is unparalleled reliability and rock solid stability – two features essential to any duct smoke detection application.

Sensitivity testing and diagnostics reveal some of the most exciting innovations built SuperDuct. With the ingenious SuperDuct remote test station, a sensitivity test can be performed at any time the safety and comfort of a maintenance office or utility room. Operated either by key or by magnet, the one-gang station also performs alarm tests for detectors connected to a single controller. Detectors may also be tested at the controller via a test switch, or they can be tested individually in the field with a simpleto-operate magnetic test tool. Access to the magnetic reed switch does not require the detector cover to be removed, so testing can be performed quickly and easily.

A dedicated dirty/trouble LED on each unit offers immediate at-aglance information even when the cover is closed.

Standard Features

Detector assembly

• Less than 2" deep for easy installation

• PCB mounted photoelectric detector with on-board intelligence

• Environmental compensation with patented differential sensing

• -4°F to 158°F (-20°C to 70°C) operating range

• 100 ft/min. to 4,000 ft/min air velocity rating

• Standard RJ45 modular interconnection

• Status LEDs remain visible through clear assembly cover

• Cover tamper reed switch for added security

• Standard sampling tube and mounting holes

• Install in tandem with the controller assembly, or remotely it

• Sampling tubes install front-side or back-side of housing

• Magnet-activated test/dirty/reset switch

• No need to open the detector for installation


• One controller for up to two detectors

• Standard connections for easy migration other detectors

• 24 Vac, 24 Vdc, 120 Vac or 230 Vac operation

• Status LEDs remain visible through clear assembly cover

• Knockouts located on the bottom

• Alarm contact, trouble contact, and two 10 amp auxiliary contacts

• No special tools required for easy access to field connections

• Interconnect up to 15 controllers for multiple fan shut- down


- SuperDuct smoke detection is ideally suited to HVAC applications where early indication of combustion is required within the confined space of ventilation ductwork.

- Duct detectors are usually installed on the supply duct after the air filters, or in the return air stream prior to being diluted by outside air.

- SuperDuct detectors continually sample air flow in the HVAC duct and initiate an alarm condition whenever smoke is detected. An alarm is activated when the quantity (percent obscuration) of combustion products in that air sample exceeds the detector’s sensitivity setting.

- Air velocity in the duct as low as 100 ft/min. maintains adequate air flow the sensor smoke chamber through air-holes in the air sampling tube and discharges through the exhaust tube. SuperDuct air sampling tubes must be installed with the inlet holes facing the airstream. Sampling tubes may be rotated in 45-degree increments so that air-holes can be aligned to allow the unit to be mounted in virtually any angle relative to the airflow.

- SuperDuct detectors are engineered to operate optimally under the harsh environmental conditions frequently found in HVAC ductwork. Nonetheless, before installing the detector, test the duct air velocity, temperature, and humidity to verify that it is within the operating range of the SuperDuct detector. Consult the SuperDuct installation sheet for details.

Four-wire Duct Smoke Detector SD-4W

Typical Layout

With SuperDuct, smoke detection for two airstreams can be monitored with just one set of field connections for fan shut-down, damper control, etc.

Four-wire Duct Smoke Detector SD-4W


Controllers and detectors come pre-assembled for easy installation for the RJ-45 models. They are sold separately for the terminal versions.


RJ-45 Model

Four-wire Duct Smoke Detector SD-4W

Terminal Model

Four-wire Duct Smoke Detector SD-4W


Controller and Detector (mounted in tandem)

Four-wire Duct Smoke Detector SD-4W



Controller: 6.75” x 5.45” x 1.90” inches (17.15 cm x 13.84 cm x 4.83 cm)

Sensor: 8.70” x 5.45” x 1.90” (22.10 cm x 13.84 cm x 4.83 cm)

Controller with sensor: 14.51” x 5.45” x 1.90” (36.86 cm x 13.84 cm x 4.83 cm)

Wire size High voltage power input terminals (L&N): #12 to #22 AWG All others: #14 to #22 AWG
Wiring distance Detector to Controller: 100 feet max for each detector Test Station to Controller: 10 ohms max. per wire (i.e. 621 feet with 22 AWG, 3,952 feet with 14 AWG) Controller Interconnect: 5 ohms max between first and last controller (i.e. 310 feet with 22 AWG, 1,976 feet with 14 AWG)
RJ-45 wiring harness Cable type: CMP
Smoke detection method Photoelectric
Air velocity rating 100 to 4,000 ft/min and meets the required minimum air pressure differential
Air pressure differential 0.005 to 1.00 inches of water
Sensitivity 0.67 to 2.46 %obscuration/ft
Reset time 2 seconds, max
Power up time 8 seconds, max.
Alarm test response time 5 to 7 seconds
Controller LED indicators Alarm (red), Trouble (yellow), Power (green)
Sensor LED indicators Alarm (red), Trouble (yellow), Dirty (yellow), Power (green)
Alarm initiation relay Quantity: 1 Style: Normally open Ratings: 2.0 A at 30 Vdc (resistive)
Auxiliary relay

Quantity: 2

Style: Form C

Ratings: 10 A at 30 Vdc, 10 A at 250 Vac (contacts must switch a minimum of 100 mA at 5 Vdc)

Supervision (trouble) relay

Quantity: 1

Style: Form C

Ratings: 2.0 A at 30 Vdc (resistive)

Auxiliary output 18 Vdc, nom., 30 mA, max.
Operating environment

Temperature (UL): -4 to 158 °F (-29 to 70 °C). Temperature (ULC): -4 to 120 °F (-29 to 49 °C)

Relative humidity: 10 to 93%, noncondensing

Operating voltages 24 Vdc, 24 V at 50/60 Hz, 120 V at 50/60 Hz, 220/240 V at 50/60 Hz
Agency Approvals UL, ULC, CSFM, FM, MEA

Ordering Information

Catalog Number Description Ship Wt. lb. (kg)
Controllers and Detectors
SD-CJ Controller (RJ45) 2.4 (1.1)
SD-SJ Sensor (RJ45)
SD-4WJ Controller w/sensor (RJ45) 3.7 (3.4)
SD-CT Controller (terminals) 2.4 (1.1)
SD-ST Sensor (terminals)


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