Phase failure and asymmetry relay FF CZF 10A 1-pole 4 s release, 45 V control

FF CZF phase failure and asymmetry relay monitors three-phase supply to detect phase loss and significant voltage imbalance. Designed for integration into control panels and automation systems, this relay provides one changeover contact (1-pole) rated for switching currents up to 10 A and operates from a 45 V control voltage. The built-in 4-second release delay helps avoid nuisance trips caused by short disturbances while ensuring equipment protection when a sustained fault is detected.

Advantages

The relay combines compact single-pole switching with selective monitoring of phase presence and asymmetry, enabling protection for motors and three-phase equipment without occupying excessive panel space. A defined 4 s release time reduces false trips from transient fluctuations, and the 45 V control rating allows compatibility with low-voltage control circuits. Its straightforward electrical characteristics make it suitable for retrofit or new installations in industrial and commercial electrical systems.

Suitable for

• Protection of three-phase electric motors from phase loss and imbalance
• Control and protection in motor starters and contactor circuits
• Integration into distribution and control panels in industrial environments
• Use in automation systems that require phase monitoring with a single changeover contact

Key specifications

• Operating function: phase failure and phase asymmetry detection
• Contact configuration: one changeover contact (1-pole)
• Switching capacity: up to 10 A
• Control voltage: 45 V
• Release time (delay): 4 seconds
• Mounting: panel or DIN-rail compatible (check device form factor before installation)

How to use

Install the relay in the control panel according to the system wiring diagram, ensuring correct connection of the three-phase inputs and the 45 V control supply. Wire the changeover contact into the motor starter or protection circuit so that the relay interrupts the load or control coil when a phase fault or unacceptable asymmetry is detected. Verify mechanical mounting and tighten terminals to the recommended torque. After wiring, perform functional tests by simulating phase loss and imbalance to confirm correct trip and release behavior with the 4 s delay.

Usage recommendations

For reliable operation, use the relay within its rated switching current and control voltage, and ensure the surrounding environment meets the product's electrical installation standards. Periodically inspect terminal connections and retest phase detection functions after major system changes or maintenance.