Phase sequence and phase failure sensor CKF-337 contacts: 1P, I=10A, voltage asymmetry 20-50V, without neutral wire, 3 modules

Phase sequence and phase failure sensor – protection for motors and installations

The CKF-337 sensor is a reliable device designed to protect three-phase powered electric motors. Its task is to detect dangerous situations, such as phase failure, phase-to-phase voltage asymmetry, or symmetrical voltage drop, which can lead to motor damage or incorrect installation operation. This device finds application in both industrial installations and in public buildings, as well as in homes with more complex electrical installations.

Functionality and application

The CKF-337 sensor monitors phase sequence, detects phase failure, and controls voltage asymmetry. This ensures comprehensive protection against various failures that threaten motors and other energy consumers. It operates without the need for a neutral wire, simplifying installation and configuration in some installations. In the event of a fault, the sensor switches off the circuit, protecting connected devices from damage. Restart occurs automatically after the network parameters stabilize.

Characteristics and benefits

• Versatile protection: protects against phase failure, voltage asymmetry, and incorrect phase sequence.
• Wireless neutral: simplifies installation in installations without a neutral wire.
• Adjustable parameters: the ability to set the switch-off delay (0.2 ÷ 5 s) allows you to adapt the sensor's operation to the specific working conditions of the installation.
• LED indication: built-in LEDs indicate the power status and correct phase sequence, facilitating diagnostics and maintenance.
• Compact dimensions: a housing with a width of 52.5 mm (3 modules) allows for easy mounting on a standard 35 mm rail in a switchboard.
• Screw terminals: ensure secure and durable connection of wires with a cross-section of up to 4.0 mm².
• Wide voltage measurement range: 190 ... 270 V – compatibility with various power networks.
• Minimum time delay in case of power failure: 4 seconds - prevents false alarms caused by short-term disturbances.

The CKF-337 sensor is a solid and reliable device that increases the safety and lifespan of electric motors and the entire electrical installation. It is an investment that can prevent costly failures and downtime of equipment.