ABB rex521chhplh07d Motor Protection Relay

ABB REX521CHHPLH07D is a multifunction motor protection relay designed for protection, control, measuring and supervision in medium‑voltage networks. It provides energizing inputs for conventional current and voltage transformers, enabling reliable CT/VT signaling from feeders and substations. The device runs on a multiprocessor platform with digital signal processing and a powerful CPU, delivering fast, accurate protection decisions and a clear local view via an LCD‑based human‑machine interface. As part of ABB’s Substation Automation family, it is intended for protection of incoming and outgoing feeders and broad substation protection schemes. The product family supports standard configurations (such as B01, B02, M01, H01, etc.) and variants (including H07/H07S); the CHHPLH07D suffix denotes the specific H07‑type configuration for this part. Verified listings show the exact part number ABB REX521CHHPLH07D, confirming the model identity and its use as a protection relay in ABB’s portfolio.