Siemens 3VA9978-0BB11 Undervoltage Release (UVR), 24V DC Accessory for 3VA4/5/6 MCCB Original Brand New

Overview

The Siemens 3VA9978-0BB11 is an essential internal accessory for the Sentron 3VA series of molded case circuit breakers (MCCB). This undervoltage release unit is engineered to monitor control voltage and trigger the circuit breaker to trip if the voltage falls below a specific threshold (typically 35% to 70% of the rated voltage), preventing damage to sensitive downstream equipment.

Key Benefit

• Enhanced Safety: Automatically disconnects the circuit during power failures or significant voltage dips to prevent equipment restart hazards.

• Seamless Integration: Specifically designed for the Siemens 3VA4, 3VA5, and 3VA6 frame sizes for a perfect fit and reliable operation.

• Compact Design: Fits internally within the breaker housing, saving external panel space.

• Reliable Protection: Provides a fail-safe mechanism for emergency stop circuits when wired in series with NC contacts.

Function & Application

• Emergency Tripping: Can be used in conjunction with emergency stop buttons to provide a remote tripping function.

• Voltage Monitoring: Continuously monitors the 24V DC control circuit.

• Compatibility: Optimized for use with the Siemens Sentron 3VA global range of circuit breakers.

Visit 3VA9978-0BB11 for more detail info

For more our products visit turll

Download

Datasheet in PDF