M-3311A Transformer Protection (2, 3, or 4-Winding) Relay

Use the M-3311A Transformer Protection Relay to protect transformers of all sizes and other important power system apparatus. It protects 2, 3, and 4 winding transformers for both transmission and distribution applications. It offers unit protection of other electrical apparatuses and certain bus arrangements (including those with a transformer in the zone). The M-3311A can be used for system backup protection, load shedding of voltage and frequency, bus protection, and individual breaker failure protection for each winding input. Available voltage configurations include zero, two, or four voltage inputs, and ground differential configurations include one, two, or three current inputs.Additional features of the M-3311A include: