A #12 aluminium conductor with an insulation factor of 75 or 90 degrees C is rated at 15 amp. Therefore the largest size breaker to protect that wire will be a breaker rated at 15 amps.
Normally it is a 20 amp using AWG 12/2 gauge wire. But it really depends on what size wire is on that circuit. If it is white AWG 14 gauge then use a 15 amp breaker. If it is yellow AWG 12 gauge then use a 20 amp breaker.
You listed no gauge wire. This is the required breakers.14 gauge - 15 amp12 gauge - 20 amp10 gauge - 30 amp8 gauge - 40 amp
For a 100 Amp breaker panel it would be 2 AWG. For 150 Amps it would require 2/0 (2 ought) aluminum wire.
14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.
In standard construction this would require a 15 amp breaker and 14 gauge copper wire.
The recommended wire size for a 100 amp breaker is typically 2-gauge copper wire or 1/0-gauge aluminum wire.
The recommended wire size for an 80 amp breaker is typically 4 AWG (American Wire Gauge) for copper wire and 2 AWG for aluminum wire.
The recommended wire size for a 70 amp breaker is typically 4 AWG (American Wire Gauge) for copper wire and 2 AWG for aluminum wire.
The recommended wire size for a 50 amp breaker is typically 6-gauge wire.
The recommended wire size for a 20 amp breaker is typically 12-gauge wire.
The appropriate wire size for a 25 amp breaker is typically 10 gauge wire.
The appropriate wire size for a 30 amp breaker is typically 10 gauge wire.
The recommended wire size for a 25 amp breaker is typically 10 gauge wire.
The recommended wire size for a 30 amp breaker is typically 10 gauge wire.
The recommended wire size for a 50 amp breaker is typically 6-gauge wire.
The recommended wire size for a 60 amp breaker is typically 6-gauge wire.
The recommended gauge size for a 100 amp aluminum wire installation is typically 2 AWG (American Wire Gauge).