Relay for phase loss and asymmetry FF CZF-BS 10A 1P 4s 55V

FF CZF-BS is a phase loss and asymmetry relay engineered to monitor a single-phase supply and protect connected equipment from phase failure or voltage imbalance. The device is rated for 10 A with a single pole contact, operates with a 4-second delay and a 55 V threshold for activation. It is suitable for installation in industrial control panels and enclosures where basic single-phase protection is required to prevent damage to motors, control circuits and other electrical loads.

Advantages

The relay provides reliable detection of phase loss and asymmetry with a fixed time delay to avoid nuisance tripping during transient disturbances. Its single-pole switching and 10 A current rating make it compatible with a wide range of single-phase loads. The 55 V operating threshold ensures activation when voltage drops below safe levels, while the simple design facilitates straightforward mounting and wiring in standard control panels.

Suitable for

• Protection of single-phase motors and pumps
• Control circuits and relay logic protection in industrial panels
• Household and commercial electrical equipment requiring phase-loss monitoring
• Retrofit protection in existing distribution boards and control cabinets

Key specifications

• Function: phase loss and asymmetry monitoring for single-phase supplies
• Rated switching current: 10 A
• Contact configuration: single pole (1P)
• Time delay: 4 seconds (fixed)
• Operating threshold voltage: 55 V
• Mounting: panel or DIN-rail compatible enclosure (verify compatibility with panel design)

How to use

Install the relay into the control panel according to the panel layout and local electrical standards. Connect the incoming single-phase supply to the relay input terminals and wire the relay contact in series with the load or control circuit to interrupt power when a fault is detected. Verify correct polarity and tighten terminals to the manufacturer’s recommended torque. After wiring, apply supply voltage and perform functional tests by simulating under-voltage or phase-loss conditions to confirm the relay trips after the specified delay.

Usage recommendations

For reliable operation, use the relay within its rated current and voltage limits and combine it with appropriate fusing or circuit protection. Avoid exposure to excessive vibration, moisture or temperatures outside the equipment’s rated range. Periodically test the relay as part of routine maintenance and replace it if mechanical wear or contact deterioration is observed.