Siemens 3VA9978-0BB20 Undervoltage Release 24V AC

The Siemens 3VA9978-0BB20 is an undervoltage release accessory designed for Siemens 3VA4, 3VA5, and 3VA6 series circuit breakers. It operates with a voltage of 24V AC at 50/60 Hz, providing essential protection by tripping the circuit breaker when the supply voltage drops to a critical level, preventing damage to connected equipment.

This undervoltage release is crucial for applications requiring reliable power system protection, such as in industrial control panels, manufacturing facilities, and building automation systems. It ensures the safety of machinery and personnel by automatically disconnecting power during voltage sags or failures.

As a veteran-owned business, Stanlo Automation understands the critical need for reliable industrial components. We offer this Siemens undervoltage release as part of our extensive inventory of surplus and new-old-stock parts, ensuring you get the quality components you need with the service you deserve.