Undervoltage release 380x400VAC GZ1AU385

Undervoltage release for circuit breakers – protection and reliability

The GZ1AU385 undervoltage release is a protection element designed for mounting in motor starters of the GZ1 series. Its function is to disconnect the circuit in the event of a voltage drop, protecting connected devices from damage and ensuring the safety of the installation. The device is particularly useful in applications where phase failure or voltage reduction can lead to dangerous situations or downtime.

Functionality and application

GZ1AU385 reacts to a voltage drop in the range of 380-450V AC, making it compatible with most standard three-phase installations. Side mounting to the motor starter simplifies integration with the existing system. It is primarily used as a protection against phase failure, but also as additional protection against incorrect operation of devices sensitive to voltage fluctuations. Because it does not require additional protection of apparatus, it simplifies the design and installation of electrical installations. It provides effective protection against overload, short circuit and phase failure – offering comprehensive protection in one device.

Characteristics and benefits

• Fast response to voltage drop: Ensures immediate disconnection of the circuit in the event of power supply problems.
• Side mounting: Allows easy integration with GZ1 series motor starters without the need to interfere with their construction.
• Universal control voltage: Compatible with 380-450V AC installations, which increases its flexibility of use.
• Protection against phase failure: Protects motors and other devices from damage caused by the absence of one or more supply phases.
• No need for additional protection: Simplifies installation and reduces costs associated with the purchase and installation of additional elements.
• Screw connection: Ensures a secure and durable electrical connection, minimizing the risk of wires loosening.
• High short-circuit capacity: Allows safe disconnection of the circuit even with high short-circuit currents.

It is worth remembering that the release does not have auxiliary contacts (normally open, normally closed or changeover), which means that it does not signal its operating status directly via dedicated control circuits. Its operation consists solely of disconnecting the motor starter to which it is connected.