Siemens 7XT7100-0EA00 CC Injection Unit for Rotor Earth Fault Protection

The Siemens 7XT7100-0EA00 CC Injection Unit is a plug‑in module in the SIPROTEC 4 7XT71 protection family that provides a dedicated injection path for rotor earth fault protection in generator protection schemes. Designed for panel flush mounting in a 7XP20 enclosure or for cubicle installation, it measures 235.5 mm wide, 266 mm long and 75 mm high, and is secured into the sheet‑metal housing with two screws. The unit is used to simulate rotor earth fault conditions by injecting low‑frequency test signals, enabling commissioning and calibration of rotor‑earth fault logic in generator protection schemes, with a frequency rating commonly cited as 0.5 to 4 Hz. As part of Siemens SIPROTEC 4 SIPROTEC 7XT71, the 7XT7100-0EA00 CC serves as the injection component paired with the rotor earth fault control, formally identified as a Controlling Device for Rotor Earth Fault Protection.