Features Relays for automatic control of lighting according to ambient light level - with separate light sensor 11.31 - 1 NO 16 A output contact. Sensitivity adjustment from 1 to 100 lux. One module, 17.5 mm wide. Low energy consumption. 24 V DC/AC supply version available 11.41 - 1 CO 16 A output contact. European patent “Zero hysteresis” for energy saving;. Italian patent “Light feedback compensation” principle. Selector with 4 positions: - Standard range (threshold setting 1...80 lx) - High range (threshold setting 30...1000 lx) - continuous light (helpful during installation and initial testing and for maintenance purposes) - light off (useful for vacations). For the first 3 working cycles the delay time (On and Off) is reduced to zero in order to aid installation. LED status indication. SELV separation between contact and supply circuit. Double insulation between supply and light sensor. 35 mm rail (EN 60715) mount. Cadmium free contact material. Cadmium free light sensor (IC photo diode)