--- product_id: 375786258 title: "Kidde SM120X Interconnect Accessories Smoke Relay Module" brand: "kidde" price: "₹ 15638" currency: INR in_stock: true reviews_count: 5 url: https://www.desertcart.in/products/375786258-kidde-sm120x-interconnect-accessories-smoke-relay-module store_origin: IN region: India --- # 120 VAC power supply Interconnects multiple alarms Includes 10 in. 18 GA pigtail leads Kidde SM120X Interconnect Accessories Smoke Relay Module **Brand:** kidde **Price:** ₹ 15638 **Availability:** ✅ In Stock ## Summary > 🔔 Stay connected, stay protected — the smart relay for the modern home. ## Quick Answers - **What is this?** Kidde SM120X Interconnect Accessories Smoke Relay Module by kidde - **How much does it cost?** ₹ 15638 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.in](https://www.desertcart.in/products/375786258-kidde-sm120x-interconnect-accessories-smoke-relay-module) ## Best For - kidde enthusiasts ## Why This Product - Trusted kidde brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Ready-to-Install:** Slim 7" design with included pigtail leads for quick, professional setup. - • **Manual & Automatic Control:** Supports manual pull stations and automatic detectors for versatile alerting. - • **UL-Listed Safety Assurance:** Certified reliability that meets rigorous safety standards for peace of mind. - • **Reliable 120 VAC Power Source:** Stable, low-draw power ensures continuous operation without battery hassles. - • **Seamless Multi-Device Integration:** Effortlessly links multiple smoke and heat alarms for unified safety. ## Overview The Kidde SM120X Smoke Relay Module is a UL-listed accessory designed to interconnect multiple smoke and heat alarms, enabling coordinated alerts across devices. Powered by a 120 VAC supply with low current draw, it supports both automatic detectors and manual pull stations. Its compact design and included wiring leads simplify installation, making it an essential upgrade for integrated home safety systems. ## Description 408-Sm120x features: -includes: 10 in. Long 18 GA pigtail leads. -Test/reset button. -Power Supply portion can be used with manual pull stations, flow switches and spot type heat detectors. -Use with interconnected installations. -Sensor type: relay module. -Additional info: smoke relay modules is for a min. Order of 1/ approvals: UL. Product type: -accessories. Generic specifications: -power source: 120 VAC, 60 Hz, .08 amp. Dimensions: overall height - top to bottom: -7". overall product weight: -3 lbs. Review: Put it in a junction box next to a smoke alarm in furnace room. Used a little chunk of NMD90 between the two. I have my alarm system (zone definition) set to monitor this input 24x7, this links via EyesOn out to my phone with an Invisalink(sp?) Ethernet alarm board (uses ISP communication vrs modem land line). Works well. I wanted to better protect our dog when we go shopping. DCS alarm system does not have to be activated to monitor the smokes, and notify our cell phones. Note, a 9Vdc signal relayed could likely replace this board, as I don't use most of its functionality, but this worked nice. I only used the dry contacts output. I think I needed EOL resistor for this input type. Fun project, for piece of mind. Review: These work great when you need to interconnect between 3 wire 120v smokes and a security system or PLC ## Features - Switches connected device power when a smoke/heat interconnect signal is received - Internal power Supply for pull station comparability controls and connects auxiliary warning devices - Used with multiple station alarms and detectors use with Kidde fyrnetics devices only - Kidde SM120X - Interconnect Accessories Smoke Relay Module: 408-SM120X - Smoke Relay Module ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00HQNPOHI | | ASIN | B00HQNPOHI | | Batteries Included? | No | | Batteries Required? | No | | Color | black | | Customer Reviews | 4.7 4.7 out of 5 stars (253) | | Customer reviews | 4.7 4.7 out of 5 stars (253) | | Date First Available | 16 January 2018 | | Date First Available | 16 January 2018 | | Finish | Wired | | Included components | Kidde - Interconnect Accessories Smoke Relay Module: 408-Sm120X - smoke relay module | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Item Weight | 45.4 g | | Item model number | SM120X | | Item model number | SM120X | | Manufacturer | Lumtopia | | Manufacturer | Lumtopia | | Material | Plastic | | Part number | SM120X | | Power source type | Corded Electric | | Product Dimensions | 17.78 x 35.56 x 17.78 cm; 45.36 g | | Product Dimensions | 17.78 x 35.56 x 17.78 cm; 45.36 g | | Style | Modern | ## Product Details - **Brand:** Kidde - **Colour:** black - **Item weight:** 45 g - **Power source:** Corded Electric - **Style:** Modern ## Images ![Kidde SM120X Interconnect Accessories Smoke Relay Module - Image 1](https://m.media-amazon.com/images/I/51uODL435jL.jpg) ## Questions & Answers **Q: How do you wire it to connect your fire sprinklers to the smoke alarms?** A: Hard wired into the 120 VAC to the smoke detector, Black - HOT, White - Neutral, Red - Interconnect. Alarm output; Blue - Common, Yellow - N/C, Orange - N/O, Grey - 9VDC output. http://www.kidde.com/Documents/1276en.pdf The Kidde relay modules can be used to activate auxiliary warning devices such as external bells and sirens, hallway or stairway lighting. Each relays will only activate when it receives a signal from an interconnected alarm. **Q: Will the relay still trigger in a power outage?** A: No, unless you have backup power to the alarms and the relay. **Q: Can I use this to trigger the alarms from either normally open or closed switch? Like a pull station?** A: Yes, this device can be used in either direction, as detailed in the manual. If you use an external relay (like a pull station) to short the grey wire (9v signal) with the red wire (interconnect bus), it will cause the rest of the stations to alarm. **Q: Does it matter to use normally open or normally closed? i have a apc power battery backup that powers multiple servers. if smoke alarm then no or nc?** A: It's my understanding that normally open and normally closed are both supported by apc power backup and Kidde SM120X. My advice is to use normally closed because this is a better fail-safe configuration. If you use normally closed and the connection is broken the apc will shut down. If you use normally open and the connection is broken the apc will remain running and you may never be aware that the connection was broken. I don't know which side should provides the voltage for a normally closed contact, but the SM120X has a DC output voltage for this purpose. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by B***D on 10 December 2024* Put it in a junction box next to a smoke alarm in furnace room. Used a little chunk of NMD90 between the two. I have my alarm system (zone definition) set to monitor this input 24x7, this links via EyesOn out to my phone with an Invisalink(sp?) Ethernet alarm board (uses ISP communication vrs modem land line). Works well. I wanted to better protect our dog when we go shopping. DCS alarm system does not have to be activated to monitor the smokes, and notify our cell phones. Note, a 9Vdc signal relayed could likely replace this board, as I don't use most of its functionality, but this worked nice. I only used the dry contacts output. I think I needed EOL resistor for this input type. Fun project, for piece of mind. ### ⭐⭐⭐⭐⭐ Review *by B***K on 25 January 2026* These work great when you need to interconnect between 3 wire 120v smokes and a security system or PLC ### ⭐⭐⭐⭐⭐ Review *by J***O on 17 January 2025* Great price. Works well using 6 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.in/products/375786258-kidde-sm120x-interconnect-accessories-smoke-relay-module](https://www.desertcart.in/products/375786258-kidde-sm120x-interconnect-accessories-smoke-relay-module) --- *Product available on Desertcart India* *Store origin: IN* *Last updated: 2026-05-03*