Phase Failure and Asymmetry Relay FF CZF-310 10A 1P 4s 55V

FF CZF-310 is a phase failure and asymmetry relay designed for single-pole protection of electrical installations. Rated for a 10 A load and intended for operation at 55 V, the relay monitors phase presence and voltage symmetry with a built-in 4-second response delay. It detects phase loss, phase reversal and voltage imbalance to help prevent damage to motors and three-phase equipment by initiating a protective response when irregularities persist beyond the set delay.

Advantages

The device provides reliable single-pole monitoring with a clearly specified 10 A switching capacity and a 4 s delay to avoid nuisance trips caused by short transients. Its compact design supports straightforward integration into control circuits and its voltage monitoring at 55 V makes it suitable for lower-voltage three-phase systems. The relay offers clear functional protection against phase loss, reversal and asymmetry while requiring minimal adjustment during installation.

Suitable for

• Protection of small motors and pump drives in three-phase systems
• Monitoring and safeguarding distribution panels in industrial and commercial installations
• Control circuits where detection of phase loss, reversal or imbalance is required
• Applications with a 55 V control or monitoring voltage and up to 10 A switching load

Key specifications

• Function: Phase failure and asymmetry detection
• Configuration: Single-pole switching
• Rated switching current: 10 A
• Operating/control voltage: 55 V
• Response delay: 4 seconds
• Monitored conditions: Phase presence, phase reversal, voltage asymmetry

How to use

Install the relay within the control panel following standard electrical safety practices and the manufacturer's wiring diagram. Connect the monitored phase inputs and the single-pole switching output according to the system layout and ensure the control voltage is 55 V. Set up any required upstream protection (fuses or circuit breakers) sized for the 10 A switching capability. After wiring, perform functional tests by simulating phase loss and asymmetry while observing that the relay delays tripping for approximately 4 seconds before changing state.

Usage recommendations

To ensure reliable operation, use the relay in environments protected from excessive vibration, moisture and dust, and verify compatibility with the control-voltage source. Periodically test the device under controlled conditions and confirm that upstream protection devices match the relay's rated switching current. For installations with higher currents or different system voltages, select a relay sized appropriately for the electrical parameters of the equipment.