Phase failure sensor with contactor contact monitoring CZF2 contacts: 1NO, I=10A, connection: screw terminals CZF-2

Three-phase motor protection – reliable phase failure sensor CZF2

This phase failure sensor is designed for comprehensive protection of electric motors powered by a three-phase network. Its task is to monitor the presence of voltage in each phase and detect voltage asymmetry, which can lead to motor damage. Additionally, the sensor controls the state of the contactor switching contacts, which provides an additional layer of protection.

CZF2 is a solution for both professional installers and end-users who want to ensure the long-term and trouble-free operation of their devices. Thanks to its quick response to potential hazards, it minimizes the risk of costly downtime and repairs.

Functionality and application

This sensor is particularly useful in applications where the loss of one phase or uneven load can have serious consequences for the motor's operation. It finds application in:

• Industry: protection of motors driving machines and production equipment.
• Construction: securing pumps, fans and other equipment used on construction sites.
• Agriculture: protection of motors driving irrigation systems and other agricultural machinery.
• Home installations: protection of motors in devices requiring three-phase power.

The sensor's operation is based on a constant threshold of voltage asymmetry activation. In the event of a detected irregularity, the circuit is disconnected with a 4-second delay – this is sufficient time to avoid unnecessary disconnection of the motor during momentary voltage drops. Importantly, a failure of the contactor contacts results in a permanent motor shutdown, requiring service intervention after the fault is removed.

Key features and benefits

• Multifunctionality: protection against phase failure, voltage asymmetry and damage to contactor contacts.
• Fast reaction: a disconnection delay of 4 seconds minimizes the risk of unnecessary downtime.
• Contactor contact control: additional protection against failures caused by damage to the contacts switching on the motor.
• Easy installation: thanks to the use of screw terminals (1.5 mm²), installation is simple and intuitive (tightening torque 0.4 Nm).
• Wide voltage range: the sensor works with networks with a voltage of 140-270 V AC.
• Compact dimensions: 90 mm high and 65 mm deep make it easy to install even in tight spaces.
• High reliability: solid construction ensures long-lasting and trouble-free operation of the device (operating temperature -25°C to +40°C).
• LED indicators: power control using two LEDs facilitates diagnostics and monitoring of the device's status.
• Load current up to 10A: allows use in a wide range of applications.

The voltage measurement range is from 140 to 270 V AC. The minimum and maximum time delay in case of power failure is 4 seconds. The sensor has one normally closed contact and a maximum load current of 10 A. Its depth is 65 mm and its height is 90 mm.

This sensor is an investment in the safety and reliability of your electrical equipment!