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Kidde Commercial
Kidde | SuperDuct Four-Wire Duct Smoke Detector Controller with Terminal Connections | SD-CT

SuperDuct Four-Wire Duct Smoke Detector Controller with Terminal Connections

SKU KD-SD-CT

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The Kidde SD-CT is the controller module for the SuperDuct four-wire duct smoke detector system, wired via terminal block connections. It accepts 24 VDC, 24 VAC, 120 VAC, or 220/240 VAC input, so it drops into virtually any commercial HVAC monitoring setup without a separate power supply conversion.

Built for the commercial installer

Each controller supports up to two SuperDuct detectors and provides one alarm relay, two 10A Form C auxiliary relays, and one supervision relay for FACP integration and fan shutdown. Interconnect up to 15 controllers to coordinate multi-zone HVAC shutdown from a single alarm event. UL Listed (268A), ULC, CSFM, and FM approved.

Key features

Multi-voltage input: 24 VDC, 24 VAC, 120 VAC, or 220/240 VAC - no external transformer needed for most installs
Supports two detectors per controller for flexible duct monitoring coverage
Two 10A Form C auxiliary relays for direct fan shutdown or damper control without an intermediary relay
Interconnect up to 15 controllers for coordinated multi-zone HVAC shutdown
Clear polycarbonate cover with visible Power, Trouble, and Alarm LEDs for at-a-glance status
Terminal block connections for standard wire-in installation (#14-#22 AWG)

System requirements

Pairs with Kidde SuperDuct four-wire duct smoke detectors (SD series). Mounts independently or inside the duct detector housing. Requires connection to a compatible FACP via the alarm and supervision relay contacts.

Specifications

SKU	KD-SD-CT
Brand	Kidde Commercial
Form factor	Controller module with clear polycarbonate cover
Power input	24 VDC, 24 VAC, 120 VAC, or 220/240 VAC (50/60 Hz)
Detector capacity	Up to 2 SuperDuct four-wire detectors
Controller interconnect	Up to 15 controllers for multi-zone shutdown
Connection types	Terminal blocks
Alarm relay	1x, NO, 2.0A at 30 VDC (resistive)
Auxiliary relays	2x, Form C, 10A at 30 VDC / 10A at 250 VAC
Supervision relay	1x, Form C, 2.0A at 30 VDC (resistive)
Auxiliary output	18 VDC nom., 30 mA max
Wire size	#12-#22 AWG (high voltage), #14-#22 AWG (all others)
Operating temp	-4°F to 158°F (UL) / -4°F to 120°F (ULC)
Operating humidity	10-93% noncondensing
Dimensions	6.75" x 5.45" x 1.90" (171 x 138 x 48 mm)
Ship weight	2.4 lb (1.1 kg)
Compliance	UL Listed S911 (UL 268A), ULC, CSFM, FM, MEA

Documents and resources

Spec SheetPDF

FAQs

What is the difference between the SD-CT and SD-CJ?

The SD-CT uses terminal block connections for field wiring, while the SD-CJ uses RJ45 connectors. Both controllers support the same SuperDuct detectors and relay configurations. Choose based on your site's wiring preference.

How many detectors can one SD-CT support?

Up to two SuperDuct four-wire duct smoke detectors per controller.

Can I interconnect multiple controllers for multi-zone shutdown?

Yes. Up to 15 SD-CT controllers can be interconnected for coordinated fan shutdown across multiple HVAC zones from a single alarm event.

What voltages does the SD-CT accept?

Multi-voltage: 24 VDC, 24 VAC (50/60 Hz), 120 VAC (50/60 Hz), or 220/240 VAC (50/60 Hz). No external power conversion required for most commercial installs.

Is the SD-CT UL Listed for duct smoke detection?

Yes. UL Listed under S911 (UL 268A), plus ULC, CSFM, FM, and MEA approvals.