ABB 291B935A09 Directional Ground Relay Module

ABB 291B935A09 Directional Ground Relay Module is a directional ground fault protection relay designed for protective schemes that require fault direction determination. It operates with a coil input range of 0.5 to 2 A and draws 0.25 to 4 W of power at 60 Hz, making it suitable for legacy ABB/Westinghouse protection architectures that rely on low‑power, directional signaling. The unit is sold without a cover (No Cover) and carries the 291B935A09 part number. In protection configurations, directional ground relays help identify the direction of a ground fault by evaluating current and voltage relationships, improving selectivity for feeders and other protection tasks. This module‑based device reflects ABB’s historic protection relay lineage and is used in systems where directional ground fault protection is required within a protection scheme.