Microprocessor phase failure and asymmetry sensor CZF-331-TRMS

Intelligent three-phase motor protection – phase failure sensor CZF-331-TRMS

This microprocessor-based phase failure and asymmetry sensor is a reliable solution for protecting electric motors powered by a three-phase network. The device monitors the voltage continuity in each phase and detects asymmetry, preventing damage resulting from incorrect power supply. DIN rail mounting simplifies integration with the existing electrical installation.

The CZF-331-TRMS is equipped with two switching contacts (2NO/NC), allowing for flexible configuration of control and signaling circuits. In the event of a phase failure or asymmetry, the relay contact disconnects, preventing the motor from starting or immediately shutting it down. A shutdown delay of 4 seconds minimizes the risk of false alarms caused by momentary voltage drops.

Application and functionality:

• Motor protection: The key function is to protect the motor from damage in the event of a phase failure or voltage asymmetry.
• DIN rail mounting: Enables quick and easy installation in electrical switchboards.
• Two switching contacts (2NO/NC): Allow connection of additional signaling or control devices, increasing the system's functionality.
• Adjustable trigger thresholds: Allow adjustment of the sensor's sensitivity to specific installation operating conditions.
• Wide voltage range: The sensor operates in the voltage range of 140-270V, making it compatible with various power networks.
• Phase failure detection: Reacts immediately to the lack of voltage in any phase, protecting the motor from overload and winding damage.
• Phase asymmetry control: Monitors the uniformity of interphase voltages, preventing the negative effects of unbalanced load.

Construction and operating parameters:

The device is characterized by a solid construction and high reliability. Screw connection ensures secure and durable electrical connections. The CZF-331-TRMS does not require an external power source, which simplifies installation and reduces operating costs. Compact dimensions (90 mm high and 65 mm deep) allow installation even in limited space. The device meets safety standards and is designed to operate at temperatures from -25°C to 40°C. The use of True RMS technology ensures accurate voltage measurement regardless of the shape of the sinusoidal waveform, which is particularly important for non-linear loads.