FF phase failure and phase asymmetry relay CKF-316 10A 1P 4s 55V

FF CKF-316 is a single-pole phase failure and phase asymmetry relay designed to protect motors and three-phase equipment in industrial and commercial electrical installations. Rated for 10 A with a control voltage of 55 V, the relay continuously monitors phase presence and balance, detecting phase loss and unacceptable phase asymmetry. A built-in 4-second delay prevents nuisance tripping during brief disturbances, allowing stable operation while still providing reliable protection against sustained faults.

Advantages

The relay combines phase failure detection and phase asymmetry monitoring in a compact single-pole unit, offering straightforward installation and integration into control circuits. Its 10 A current rating suits direct control of many contactors or signaling devices, while the 4-second operating delay reduces false trips caused by transient voltage fluctuations. The 55 V control voltage allows compatibility with control systems that use low-voltage DC or specialized AC supplies.

Suitable for

• Protection of three-phase motors against phase loss and imbalance
• Monitoring of supply symmetry in industrial machinery and HVAC systems
• Integration with contactors and motor starters in control panels
• Commercial electrical installations where phase monitoring is required

Key specifications

• Protection functions: phase failure detection and phase asymmetry monitoring
• Poles: single-pole (1P)
• Current rating: 10 A
• Control voltage: 55 V
• Response delay: 4 seconds
• Application: designed for monitoring three-phase supply and protecting motors/equipment

How to use

Install the relay in the control panel following standard wiring practices for protective relays, ensuring correct connection to the three-phase supply and to the control circuit at 55 V. Configure the relay as part of the motor starter or protection chain so that it can interrupt the control circuit or send a trip signal when phase loss or asymmetry is detected. The built-in 4-second delay is automatic; no external timing adjustments are required. Verify wiring and functionality by performing an acceptance test that simulates phase loss and verifies the relay trips after the specified delay.

Usage recommendations

Use the relay together with appropriately rated contactors or breakers and ensure control wiring matches the relay's 55 V requirement. Periodically inspect electrical connections and test the phase monitoring function during maintenance intervals to ensure reliable operation. Avoid exposure to harmful environmental conditions beyond the relay's intended installation environment.