Industrial 197909-T7 Hk Undervoltage Device 125V DC

197909-T7 HK undervoltage device assembly is an ABB/ITE/BBC accessory for the HK family of molded‑case circuit breakers, designed for use with the 5HK350 equipment type and featuring a 125 V DC control input. As an undervoltage trip device, it monitors the 125 V DC control circuit and triggers a breaker trip to interrupt current when undervoltage is detected, helping protect downstream equipment from voltage sag or loss. This UV device is listed in historical BBC/ABB catalogs as the 197909‑T7 undervoltage device assembly and is designed to integrate with HK series breakers to provide reliable under‑voltage protection in industrial switchgear. Its 125 V DC control voltage aligns with common industrial control circuits, supporting safe shutdown and protection within electrical panels that rely on HK‑series protection schemes. With ABB/ITE lineage spanning BBC Brown Boveri to ABB, this component represents mid‑century UV protection hardware that continues to be referenced in legacy part catalogs for restoration or replacement of HK breakers.