The F&F CKF-BR-TRMS Rail Relay monitors the voltage of each phase in three-phase networks and protects against:

• Phase loss
• Voltage asymmetry
• Incorrect phase sequence

In case of detected voltage loss or asymmetry above the set limit, it switches off the motor with a 4 s delay. Additionally, in the event of an incorrect phase sequence, it prevents the motor from starting.

Technical specifications:

• Supply voltage: 3 × 400 V + N
• Maximum load current: 10 A
• Contact configuration: 1 × NO/NC
• Voltage asymmetry activation: 40-80 V
• Voltage hysteresis: 5 V
• Switch-off delay: 4 s
• Power control: 2 × LED
• Connection: screw terminals 4.0 mm²
• Tightening torque: 0.5 Nm
• Power consumption: 1.6 W
• Operating temperature: -25÷40°C
• Dimensions: 2 units (35 mm)
• Mounting: on 35 mm rail
• Protection rating: IP20