Phase failure and phase asymmetry relay FF CKF-317 1P 10A 4 s 40–80 V

FF CKF-317 is a single-pole phase failure and phase asymmetry relay designed to monitor and protect low-voltage three-phase supplies within the 40–80 V range. The device detects incorrect phase sequence, phase loss and voltage asymmetry and, after a 4-second intentional delay, operates its 10 A output contact to disconnect the load. The compact relay is intended for installation in control panels and switchgear where automated phase monitoring reduces the risk of motor and equipment damage and helps avoid unplanned downtime.

Advantages

The relay provides reliable detection of phase sequence errors, single-phase failure and asymmetry in voltage between phases, with a defined response delay to avoid nuisance tripping during transient conditions. Its single-pole contact configuration and 10 A rating make it compatible with control circuits and direct switching of protection coils and relay inputs. The 40–80 V operating range is tailored to low-voltage systems, and the simple function set supports straightforward integration into existing control cabinets.

Suitable for

• Protection of three-phase motors and pumps against phase loss and incorrect rotation
• Control and monitoring circuits in industrial control panels and switchgear
• Applications where low-voltage phase monitoring is required (40–80 V)
• Systems needing automatic disconnection after a deliberate 4 s verification delay

Key specifications

• Function: phase failure and phase asymmetry monitoring with phase sequence detection
• Poles: single-pole (1P) switching contact
• Contact rating: 10 A
• Operating voltage range: 40–80 V
• Response delay: 4 seconds (fixed)
• Output: mechanical switching contact suitable for control circuits

How to use

Install the relay in the control panel according to local electrical codes and panel layout requirements, ensuring correct wiring of the three-phase inputs for phase sequence and voltage sensing. Connect the relay output to the control circuit or contactor coil that will be used to isolate the load. After applying supply voltage, the relay continuously monitors phase presence, sequence and asymmetry; if a fault condition persists beyond the 4 s delay, the relay will open its 10 A contact to disconnect the protected equipment.

Ieteikumi par lietošanu

Place the relay on a DIN rail or mounting location suitable for the panel, avoid locations with excessive vibration or moisture, and confirm that downstream devices are rated for interruption by a 10 A contact. For reliable protection, combine the relay with overload protection and proper motor starting controls where applicable.