Not that I know of. The largest GFCI breaker I have seen is a 60 amp.
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GFCI breakers are typically available in lower amperage ratings, such as 15 or 20 amps. 100 amp GFCI breakers are not common due to the high level of current they need to interrupt. It is more common to use GFCI protection at the branch circuit level for smaller circuits.
No, a double pole 50 amp breaker protects a 240 volt supply at 50 amps. The number that is on the handle of the breaker is the amperage that the breaker will trip at if an overload occurs on the circuit.
Nuisance tripping of GFCI breakers in a sub panel may be caused by a variety of factors, such as moisture exposure, improper wiring, or a ground fault in the system. If the neutral is improperly bonded to ground in the sub panel, it could also cause nuisance tripping as the GFCI breakers may detect a ground fault when there isn't one. It's important to ensure that the neutral and ground are properly separated in sub panels to prevent such issues.
If a 100 amp breaker keeps tripping there is an overload on the system.
The instantaneous trip setting for a 100 amp breaker should be set around 500-1000 amps to allow for momentary inrush currents without tripping the breaker. It's important to refer to the manufacturer's specifications for the specific breaker model to determine the appropriate setting.
There could be several reasons for the power shutting off or lights flickering with a 100 amp breaker on an outside pole, including overloaded circuits, short circuits, loose connections, or a faulty breaker. It is recommended to contact a qualified electrician to inspect the issue and address any potential safety hazards.