Kidde SM120X Smoke Alarm Relay 120 Volt

Product Description

The KIDDE SM120X is a relay module designed to work with 120-volt smoke alarms. It monitors the alarm line and triggers a switched output when the connected smoke alarm activates. This allows the alarm signal to control secondary devices such as door holders, HVAC shutdown relays, or other low-voltage systems that require a dry contact closure. The SM120X is a single-unit component typically installed by licensed electricians or fire alarm contractors as part of a residential or light commercial life-safety system.

The SM120X is suited for installations where a standard 120-volt AC smoke alarm must interface with auxiliary equipment. Common applications include connecting a smoke alarm to a magnetic door holder, a fan shutdown control, or a building automation input. It is used in residential retrofits and new construction where interconnected smoke alarm systems need to trigger secondary safety functions without a full addressable fire panel.

Key Features

• Compatible with 120-volt AC smoke alarm circuits
• Provides a relay output for controlling auxiliary devices
• Enables smoke alarm integration with HVAC shutdown or door release systems
• Single-unit packaging suitable for individual zone applications
• Designed for use in residential and light commercial fire safety installations

Compatibility

Designed as an OEM-style relay module for use with 120-volt interconnected smoke alarm systems. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a licensed electrician or qualified fire alarm contractor in accordance with NFPA 72 and applicable local codes. Disconnect power to the smoke alarm circuit at the breaker before wiring the relay module. Do not exceed the relay output ratings when connecting auxiliary loads. Verify all wiring connections before restoring power and test the full system to confirm proper relay activation on alarm.