This Acti9 iTLi is a modular impulse relay. It is a changeover contact with 1 normally open and 1 normally close contact. Rated current is 16A, 24VAC to 250VAC operating voltage and it operates with 48VAC or 24VDC control voltage. Electrical endurance goes up to 200000 cycles for AC-21 or 100000 cycles for AC-22. The switching frequency is 5 switching operations/minute or 100 switching operations/day. The duration of the command order should be between 50ms to 1s. It is mainly used for lighting control applications. The Ui rated insulation voltage is 440VAC. The Uimp rated impulse withstand voltage is 6kV. The operating frequency is 50Hz or 60Hz. It is DIN rail mountable. Pollution degree is 3. Overvoltage category is IV. The dimensions are (W) 18mm x (H) 84mm x (D) 60mm. The degree of protection is IP20 and IP40 in an enclosure. The operating temperature is from -20°C to 50°C. The storage temperature is from -40°C to 70°C. This product is compliant with IEC/EN 60669-1 and IEC/EN 60669-2-2 standard.