The EDDKG403N is a Craig & Derricott 3P Pole Isolator Switch from the EDDKG 403 series, designed for manual load isolation in industrial control circuits up to 40A. This switch disconnector is typically mounted on control panels or DIN rails for safety isolation purposes. Critical verification: confirm 40A rating matches your circuit's maximum demand and that 1NO/1NC configuration aligns with your control logic requirements.