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Kidde SM120X Smoke Relay Module
The Kidde SM120X is a relay module designed to interconnect Kidde smoke alarms with external devices such as door holders, HVAC shutoffs, and building automation systems. When any interconnected smoke alarm triggers, the SM120X closes its relay output, activating the connected device — enabling coordinated, code-compliant fire response across a facility.
Technical Specifications
- Model: SM120X
- Operating Voltage: [Insert from datasheet]
- Relay Contact Rating: [Insert from datasheet]
- Compatible Systems: Kidde interconnected smoke alarm systems
- Wire Gauge: [Insert from datasheet]
- Listings/Certifications: [UL listing number if applicable]
- Weight: 1 lb
- Condition: New
Key Features
- Closes relay output on any interconnected alarm activation
- Enables integration with HVAC shutoffs, door holders, and BAS platforms
- Compact form factor for panel or junction box mounting
- Designed for use with Kidde interconnect-capable smoke detectors
Installation Overview
- Confirm compatibility with the existing Kidde interconnected smoke alarm circuit
- Mount the SM120X in the designated panel or enclosure location per local fire codes
- Connect to the smoke alarm interconnect wire per Kidde wiring diagram
- Wire relay output terminals to the controlled device (HVAC, door holder, etc.)
- Test by activating any interconnected smoke alarm and verifying relay closure and device response
- Record installation details for AHJ inspection and maintenance documentation
Typical Applications
- Multi-unit residential buildings requiring coordinated alarm and HVAC shutoff
- Commercial facilities integrating smoke detection with building automation
- Retrofit projects adding relay output to existing Kidde interconnect systems
- New construction requiring code-compliant smoke-to-device integration
Manufacturer Resources
Product Specs
Kidde SM120X – Frequently Asked Questions
1) What does the Kidde SM120X relay module actually do on a smoke alarm circuit?
The SM120X ties into a Kidde interconnect circuit and closes a relay output whenever any interconnected alarm on that circuit goes off. That dry contact is what drives an external device: an HVAC shutdown, a magnetic door holder, or an input on a building automation system. It does not detect smoke itself, and it does not sound. It's the bridge between the alarms and whatever else has to react when they trip.
2) Will the SM120X work with my existing smoke detectors, or does it have to be Kidde?
Kidde only. The SM120X is built for Kidde interconnect-capable smoke detectors and wires to the Kidde interconnect wire per Kidde's diagram. If the alarms already on the circuit are another brand, this module is not the part, and mixing brands on an interconnect line isn't something to attempt on a life safety circuit. Confirm the existing alarms are Kidde interconnect models before you order.
3) Can I add HVAC shutoff to a Kidde alarm system that's already installed, or does it only work on new construction?
Retrofit is one of the intended uses. If a building already has a Kidde interconnect circuit running, the SM120X adds a relay output to it without replacing the alarms. Common on multi-unit residential where coordinated alarm plus HVAC shutoff gets added after the fact, and on commercial buildings pulling smoke detection into a BAS. New construction works the same way.
4) Where does the SM120X mount, and does it need its own enclosure?
It's a compact module intended for panel or junction box mounting, with wire leads out of the body rather than terminals on a faceplate. Location goes where local fire code puts it. Wiring is two sides: the interconnect wire from the alarm circuit on one, and the relay output terminals to the controlled device on the other.
5) How many SM120X modules do I need if I want to run both a door holder and an HVAC shutoff?
Each SM120X gives you one relay output, so one controlled device per module. Driving a door holder and an HVAC shutdown from the same alarm circuit means two modules wired to the same interconnect line, each with its own output run to its device. Model is sold as the single SM120X.
6) How do I verify the SM120X is working after install for an AHJ inspection?
Trip any alarm on the interconnect circuit and confirm two things happen: the relay closes and the controlled device responds, whether that's the fan shutting down or the door holder releasing. Testing from any interconnected alarm is the point, since the module reacts to activation anywhere on the circuit, not just the nearest head. Log the install details for the inspection record and future maintenance.
How fast can I get the Kidde SM120X delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Kidde SM120X come with a warranty?
Absolutely. The Kidde SM120X is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Kidde SM120X?
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