Schneider Electric GT-918 Ground Fault Sensor

The Schneider Electric GT-918 Ground Fault Sensor is a current-transformer style external sensing device designed to provide ground-fault detection for Square D protection schemes. As part of Schneider Electric's Square D GT family, the GT-918 monitors leakage current to support protective action in electrical distribution equipment and is used in industrial control panels and switchgear to enhance personnel safety and equipment protection. The GT-918 is listed alongside GT912 and GT930 models in the Square D product family, indicating its role as a dedicated ground-fault sensor within this lineup. Catalog entries for this family note a window size configuration such as 5 x 14 inches (127 x 356 mm) for ground-fault sensor assemblies, reflecting the physical form factors used across GT-series sensors. Bearing the Square D branding, this sensor should be installed following Schneider Electric installation instructions and aligned with applicable safety standards and electrical codes. As a current transformer-based sensor, the GT-918 interfaces with compatible Square D protection devices to form a complete ground-fault protection solution within protective relays and circuit-breaker assemblies.