UL 4 Wire Smoke and Heat Detector

UL 4 Wire Smoke and Heat Detector. Built-in Alarm Relay: Features an integral volt-free changeover relay for direct connection to control panels. Global Certifications: Meets UL 268, UL 521, EN 54-7, and CE standards for international compliance. 4-Wire Operation: Designed for 4-wire systems with wide operating voltage (10.8-24V DC) and low power consumption. Advanced Design: Polished design with extra areola for visibility from all angles during alarm conditions. Professional Manufacturer: Numens is a professional manufacturer with vertically integrated production capabilities.