High-frequency (100 Hz-10 MHz), low current (a few hundred amperes) arcs are formed in SF₆ puffer circuit breakers under certain conditions when inductive loads are switched. There is evidence that such arcs, which are filamentary in nature, can cause damage to the interrupter nozzle. Information about the behaviour and location of such arcs is therefore important for elucidating the nature of the performance-threatening events associated with them. An optical-fibre-based triangulation technique is described for locating the position of these high-frequency filamentary arcs within the circuit breaker nozzle. Results obtained with this system are presented. These show some important trends in arc behaviour that provide an insight into the problem of inductive current interruption.