Phase sequence and phase failure sensor CKF-316 contacts: 1P, I=10A, 1 module

Phase control and motor protection – reliable sensor CKF-316

The CKF-316 phase sequence and phase loss sensor is a key element in electrical protection systems, particularly important for protecting three-phase motors. The device monitors phase continuity, their order of occurrence, and voltage asymmetry, minimizing the risk of damage caused by incorrect installation operation. Mounted on a 35mm rail, it occupies only 1 module (18mm) of space, making it easy to integrate with existing switchboards.

Wide application and reliability make the CKF-316 an ideal solution for both professional installers and end-users who care about the safety and continuity of their equipment. Thanks to the quick detection of power supply problems, the sensor helps avoid costly downtime and repairs.

Features and benefits

• Motor protection: Protects electric motors from the effects of phase loss or voltage asymmetry, which can lead to their damage.
• Phase sequence control: Prevents incorrect motor start-up in the event of a phase sequence change, which could damage it or change the direction of rotation.
• Turn-off delay: A 4-second delay before motor shutdown eliminates the risk of false alarms caused by momentary voltage drops.
• LED indication: Two LEDs indicate correct power supply and any problems with the phase sequence.
• Compact dimensions: Mounting on a 35mm rail takes up only 1 module (18mm), making installation easier even in crowded switchboards.
• Universal power supply: Power is supplied directly from the tested three-phase network (3x400V + N), eliminating the need for additional power sources.
• Contact separation: Ensures the independence of the control circuit from the power circuit, increasing safety and reliability.

Technical characteristics in practice

CKF-316 reacts to voltage asymmetry above 55V, and its voltage hysteresis is 5V – this means that the sensor will not be sensitive to small voltage fluctuations in the network. A relay with a maximum load of 10A allows you to control various protective or signaling devices. Screw terminals allow connection of wires with a cross-section of up to 2.5 mm², and a tightening torque of 0.4 Nm guarantees a secure electrical connection. The device operates in a wide temperature range from -25°C to +40°C, making it suitable for use in various environmental conditions.