The Danfoss CI 9 400V AC 4P is a motor protection combination made up of a contactor and a built-in thermal overload relay. It is designed for the protection of 3-phase motors and other 3-phase apparatus up to 7.5 kW, 400 V AC. It has an adjustable trip setting range, with a high breaking capacity up to 120 kA at 400 V AC, together with a wide operating temperature range from -40 to 55 °C. The unit has 4 poles, a preventive trip monitor, and a manual reset. It provides protection against phase failure, phase unbalance, phase reversal, over-voltage, under-voltage, and phase sequence reversal. The CI 9 also features a wide voltage range and is suitable for both 50/60 Hz applications. It can be used as a primary or secondary protection device.