Phase failure sensor with contactor contact monitoring CZF-2BR contacts: 1NO, I=10A, adjustable threshold: 165-180V, 2 modules

Protection of electric motors and power supply systems

The CZF-2BR phase failure sensor is a reliable device designed to protect electric motors powered by a three-phase network. It protects against the effects of voltage loss in one or more phases, voltage asymmetry, and damage to contactor contacts, which could lead to serious failures and costly downtime. This ensures continuity of operation and extends the life of connected devices.

Functionality and application

The device monitors the voltage status in the three-phase network, reacting to irregularities such as phase failure or voltage asymmetry. If a problem is detected, the sensor switches off the power supply, preventing damage to the motor. Additionally, contactor contact monitoring allows detection of their wear or damage, which is crucial for maintaining system reliability. This solution is used in industrial plants, workshops, public buildings, and anywhere where effective protection of electric motors is required.

Key features and benefits

• Versatile protection: Protects against phase failure, voltage asymmetry, and contactor contact damage – comprehensive protection for the motor and installation.
• Adjustable trigger threshold: The ability to precisely adjust the trigger threshold (165-180V) to the specific operating conditions of the installation. This avoids unnecessary shutdowns caused by temporary voltage drops.
• Fast response: The maximum time delay in the event of a power failure is 4 seconds, ensuring a quick response to a failure and minimizing the risk of motor damage.
• Compact size: Mounting on a 35 mm rail takes up only 2 modules – saving space in the switchgear.
• LED indicators: Facilitate diagnostics and monitoring of the device status.
• Durable connections: The use of screw connections ensures stable and reliable connection of wires (4.0 mm²).
• Designed for professionals: The device is ideal for both electrical installers and end-users looking for reliable protection of their equipment.

Technical parameters in practice

The voltage measurement range of 140…270 V allows operation in a wide range of network conditions. No need for an external power source simplifies installation and reduces operating costs. A normally closed contact with a maximum load current of 10A ensures compatibility with most standard loads. It should be noted that the terminals cannot be disconnected – which affects the convenience of servicing, but at the same time increases the safety of the connections.