Siemens 3VA9377-0NA10 Neutral Current Transformer

Siemens 3VA9377-0NA10 External Sensor Neutral Current Transformer is a black, breaker-feed-through neutral current transformer designed for use with Siemens 3VA2 and 3VA6 low-voltage molded-case circuit breakers. It handles a 400–600 A primary current through the neutral conductor, providing an external sensing element for the 3VA6 electronic-trip system and related protection or metering applications. The unit’s footprint is approximately 4.92 inches wide, 1.2 inches deep, and 5.5 inches high, making it suitable for panel installations where space is a consideration. Operating temperature ranges are typically specified from -25 to 70 C, enabling reliable performance in standard distribution environments.