Siemens 3VA9978-0BL32 Shunt-Trip Auxiliary Release for 3VA Breakers

The Siemens 3VA9978-0BL32 is a shunt-trip auxiliary device intended for use with 3VA series molded-case circuit breakers. It enables remote or automatic tripping of breakers when a control signal (AC or DC) is applied, improving safety and automation in power systems.

This accessory is rated for control voltages of 110–127 V AC or DC. It is designed to integrate seamlessly into compatible 3VA breakers, offering reliable electrical isolation and triggering under overload or emergency conditions. The compact housing keeps the overall breaker size efficient while adding important control capability.

The 3VA9978-0BL32 is suitable for industrial, commercial, and infrastructure installations where automated or remote breaker control is needed — such as building distribution boards, motor control centers, or emergency shutdown circuits. It provides robust performance, stable operation over time, and compliance with 3VA accessory specifications.

Use this shunt-trip module when you need a flexible, safe, and professional solution to enable electronically triggered breaker disconnection without modifying the main breaker frame.