FF phase loss and phase asymmetry relay CZF-BR 10A 1P 4s 40–80V

The FF phase loss and phase asymmetry relay CZF-BR 10A 1P 4s 40–80V is an electromechanical protection device designed to detect loss of phase and significant phase voltage imbalance in three-phase supplies. The single-pole relay interrupts control circuits when asymmetry or phase failure occurs, helping to prevent damage to motors and other three-phase equipment. It operates within a 40–80 V operating voltage range and is rated for switching currents up to 10 A, with a 4-second response delay to avoid nuisance tripping from short transients.

Advantages

The relay offers reliable electromechanical operation compatible with standard control panels and motor protection schemes. Its single-pole design and 10 A rating make it suitable for a wide range of control circuits while keeping installation straightforward. The 4-second delay, fixed or adjustable depending on model variant, reduces false trips caused by brief voltage dips and ensures stable protection against sustained phase faults. The compact format and robust construction are intended for industrial and commercial environments.

Suitable for

• Protection of three-phase motors controlled by contactors and starters
• Monitoring and safeguarding of industrial control panels and switchgear
• Detection of phase loss and imbalance in HVAC and pumping systems
• Use in manufacturing equipment where phase continuity is critical

Key specifications

• Function: phase loss and phase asymmetry detection
• Poles: single-pole (1P) switching element
• Rated switching current: 10 A
• Operating voltage range: 40–80 V
• Response delay: 4 seconds (fixed or adjustable variant)
• Type: electromechanical relay suitable for control circuits

How to use

Install the unit in the control panel according to the wiring diagram, connecting the monitored phase inputs to the relay’s sensing terminals and the switching contact into the control circuit of the motor starter or contactor coil. Ensure supply voltage to the relay falls within the 40–80 V range and secure all terminations. Adjust or confirm the 4-second response delay if the model provides adjustment. After wiring, perform a functional test by simulating phase loss or imbalance and verify the relay opens the control circuit as expected.

Usage recommendations

Place the relay in a protected enclosure and avoid exposure to moisture, excessive vibration, and temperatures outside the equipment specifications. Combine CZF-BR protection with overload and short-circuit protection devices for comprehensive motor protection, and schedule periodic inspections and functional tests to confirm continued operation.