Voltage and phase loss sensor CZF-310 contacts: 1P, I=10A, 1 module

Phase Failure Sensor – Reliable Motor Protection

This phase failure sensor, catalog number CZF-310, is a key element in protecting three-phase powered electric motors. Its function is to monitor the presence of voltage in each phase and detect voltage asymmetries that can lead to motor damage. The device is particularly useful in installations exposed to voltage fluctuations or power supply failures. Its compact size – only one module – makes it easy to mount on a standard 35 mm rail.

Functionality and Application

CZF-310 reacts to voltage loss in any phase or to voltage asymmetry exceeding a set threshold. If such a situation is detected, the circuit is disconnected with a 4-second delay. This delay minimizes the risk of accidental motor shutdown caused by momentary voltage drops. After the correct power supply conditions are restored, the device automatically allows the motor to restart after the voltage increases by 5V above the trigger threshold. This ensures continuity of operation and minimizes downtime.

The device finds application in:

• Protecting electric motors in industry and construction.
• Protecting devices sensitive to voltage fluctuations.
• Installations requiring high reliability and safety.
• Automation and control systems.

Technical Specifications and Construction

CZF-310 has a 1P (NO/NC) changeover contact, allowing for flexible adaptation to different control schemes. It is made of high-quality materials, guaranteeing its durability and reliability. Electrical connection is realized via screw terminals, accepting wires with a cross-section of up to 2.5 mm². LED indicators signal the presence of power in each phase, facilitating diagnostics and monitoring of the device's status. The device is characterized by low power consumption (0.56W) and a wide operating temperature range (-25°C to +40°C). The maximum load current is 10A. The voltage asymmetry trigger is approximately 55V, and the voltage hysteresis is approximately 5V.