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GIS is crucial in high-voltage power systems, necessitating high standards of reliability and ease of maintenance. The circuit breaker, as the system’s core component, is vital for the safe operation of both GIS and the broader power grid. During the interruption of high current, plasma exists in the circuit breaker’s contact gap, and its movement, influenced by transient recovery voltage (TRV), leads to post-arc current. Accurately measuring this post-arc current is essential for assessing the circuit breaker’s performance. This paper presents a self-developed testing device that evaluates post-arc current under harmonic influences, exploring how varying short-circuit current frequencies and zero-front current slopes affect the characteristics of the post-arc current in a 126 kV pressurized gas circuit breaker.