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What is the operating voltage range for GHBGFEP circuit breakers?

GHBGFEP single-pole circuit breakers are built on the GHB frame, and for ground fault current (leakage) detection operate at the equipment protective (30mA) sensitivity level.  All GHB single-pole breakers are 277VAC rated.  As such their GF current detection circuitry is designed to power up a 277VAC +/- 15%.  If the GF current detection circuitry control powering voltage is less than about 235-240VAC the breaker will still operate as an over current protective device (OCPD) for the connected load, but will not detect any current lost to ground because the internal GF current detection circuitry will not power up.