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Please confirm whether the QBGFT breaker would work with 50 Hz application.

The QBGFT breaker is part of the Quicklag breaker family. Quicklag breakers are UL 489 labeled. The applicable standard, UL 489, dictates that any breaker tested and labeled as UL 489 rated must operate in a range of frequency from 48-62 Hz in order to pass UL 489 testing requirements. By this definition the breaker performs within UL guidelines for operation at both 50 Hz and 60 Hz.