Siemens 3VA9978-0BB24 Undervoltage Release (UVR), 120-127 V AC, 50/60 Hz Original Brand New

Overview

The Siemens 3VA9978-0BB24 is a critical internal accessory for the Sentron 3VA series. Operating at a voltage range of 120-127 V AC (50/60 Hz), this undervoltage release (UVR) provides an essential protective layer for industrial electrical circuits. It prevents equipment from restarting automatically after a power failure and protects sensitive loads from the damaging effects of brownouts or voltage dips.

Key Benefit

• Enhanced Safety: Automatically trips the circuit breaker during significant voltage drops to prevent equipment damage.

• Seamless Integration: Specifically engineered for a perfect fit within 3VA4, 3VA5, and 3VA6 frame sizes.

• Reliable Protection: Guards against unintentional machine restarts after a loss of power, meeting strict industrial safety standards.

• Global Compatibility: Supports both 50 Hz and 60 Hz frequencies, making it suitable for international electrical grids.

Function

• Remote Tripping: Allows the circuit breaker to be tripped remotely when integrated into a safety control circuit.

• Voltage Monitoring: Continuously monitors the incoming control supply voltage.

• Automatic Disconnection: If the voltage falls between 35% and 70% of the rated value, the UVR triggers the breaker to the "OFF" position.

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