Siemens 3VM9908-0BB26 380-400 V Under-Voltage Release for Sentron 3VM 630 A MCCB

The Siemens 3VM9908-0BB26 380-400 V Under-Voltage Release for Sentron 3VM 630 A MCCB is a protective device or feature commonly used in electrical systems and equipment to automatically disconnect power when the voltage falls below a certain predetermined level. It is designed to prevent damage to equipment, ensure safety, and protect against undesirable conditions caused by low voltage.

Here are some key points about under-voltage releases:

1. Voltage Monitoring: The under-voltage release continuously monitors the voltage level of the electrical system. It compares the monitored voltage with a predefined value and initiates a trip when the voltage drops below that value.

2. Protective Function: The primary purpose of an under-voltage release is to protect equipment and prevent potentially harmful or unstable conditions caused by low voltage. When the voltage falls below the specified threshold, the under-voltage release triggers a trip signal to interrupt the power supply, shutting down the equipment or system.

3. Voltage Recovery: After a voltage drop, the under-voltage release typically includes a time delay mechanism to ensure that the voltage has stabilized before allowing the equipment or system to be re-energized. This delay prevents nuisance tripping due to temporary voltage fluctuations or momentary voltage dips.

4. Automatic Reset: Some under-voltage releases may have an automatic reset feature that allows the equipment or system to automatically restart once the voltage has returned to normal levels. In other cases, manual intervention may be required to reset the under-voltage release and restore power.

5. Applications: Under-voltage releases are commonly used in various applications, including motor control centers, industrial machinery, power distribution systems, and electrical panels. They help protect sensitive equipment and prevent damage or malfunctioning caused by low voltage conditions.

Overall, under-voltage releases play a crucial role in maintaining the integrity and stability of electrical systems by automatically disconnecting power when voltage levels drop below a specified threshold. They help protect equipment, prevent damage, and ensure the safe and reliable operation of electrical installations.

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