Gentex SCRR-918-0033-002 120VAC Smoke & CO Alarm w/ Relays

The Gentex SCRR (918-0033-002) is a 120 VAC combination smoke and carbon monoxide alarm featuring multi-criteria photoelectric smoke detection, electrochemical CO sensing, and two sets of Form A/Form C relay contacts for auxiliary notification and system integration. Equipped with a 9V alkaline battery backup, 85 dBA audible alarm, and Gentex DUALINK interconnection technology, the SCRR provides distinct Temporal 3 smoke and Temporal 4 carbon monoxide warnings. The alarm is listed to ANSI/UL 217 9th Edition and ANSI/UL 2034 for residential and multi-unit occupancy applications.

Gentex SCRR 918-0033-002 Combination Smoke and Carbon Monoxide Alarm with Dual Relays

The Gentex SCRR (918-0033-002) combination smoke and carbon monoxide alarm provides integrated fire and CO detection with auxiliary relay control for homes, apartments, hotels, motels, and other residential occupancy environments. Part of the Gentex SC Series, the SCRR combines multi-criteria photoelectric smoke sensing and electrochemical carbon monoxide detection in one hardwired alarm. Its photoelectric light-scattering chamber detects smoke particles, while the electrochemical sensor monitors carbon monoxide concentrations. The unit operates on 120 VAC, 60 Hz power with a 9V alkaline battery backup, maintaining local alarm operation during electrical outages. Two sets of Form A/Form C relay contacts distinguish the SCRR from the standard SC and single-relay SCR models, providing additional connections for compatible remote annunciation and auxiliary equipment.

The SCRR incorporates an 85 dBA piezoelectric alarm horn measured at 10 feet, nominal 2.5% smoke sensitivity, and distinct audible evacuation patterns for identifying smoke and carbon monoxide emergencies. Smoke detection activates a Temporal 3 warning, while CO detection produces a Temporal 4 warning. Gentex DUALINK technology supports tandem interconnection with compatible smoke, CO, and combination alarms, allowing interconnected devices to communicate the detected emergency type. When smoke and carbon monoxide conditions occur simultaneously, smoke alarm annunciation takes priority. Additional operating features include an 8-hour alarm memory, push-button self-test, functional testing, automatic alarm restoration, and an LED sensing chamber. A green LED indicates AC power, while a red LED pulses approximately every 16 seconds during normal operation.

For auxiliary system integration, the Gentex SCRR provides two sets of Form A/Form C relay contacts that support programmable alarm response and remote notification connections. The manufacturer specifies a 0.3-amp auxiliary relay rating for the SCRR configuration, with relay operation maintained during battery backup. A quick-disconnect wiring harness simplifies electrical connections, while the tandem interconnect conductor allows integration with compatible Gentex S, SC, C, H, GN-503, and selected earlier alarm series. The unit also features a front-loading battery drawer, low or missing battery indication, and a fully screened sensing chamber that helps prevent insect intrusion. Installation hardware accommodates standard electrical junction boxes, and the alarm includes a protective dust cover to reduce contamination during construction or installation.

The SCRR combination smoke and CO alarm measures approximately 5.5 inches wide by 5.5 inches high by 1.75 inches deep and is designed for wall or ceiling installation in accordance with manufacturer instructions and applicable fire safety requirements. Its specified operating temperature range is 40 F to 100 F (4 C to 38 C), making it suitable for conditioned indoor environments. The Gentex SC Series is ANSI/UL 217 9th Edition and ANSI/UL 2034 listed, addressing smoke alarm and carbon monoxide alarm performance requirements. A 10-year end-of-life indicator alerts occupants when replacement is required, and the product carries a one-year manufacturer warranty from the date of purchase. With dual-sensor detection, battery-backed operation, tandem interconnection, and two relay contact sets, the SCRR provides a combination life-safety alarm for installations requiring both occupant notification and auxiliary signaling capabilities.