Amazon : 3 Phase Breaker
ASI AC Miniature Circuit Breaker - 3 Pole DIN Rail Mount 20 Amp 480 Volt Unit with Shock-Proof Terminations, Trip Curve C, L1, L2, L3 and Neutral Three-Phase Circuits
Three-phase circuit breakers are electrical components used in three-phase circuits, which have three live conductors. They are commonly used in industrial circuit protection for applications such as air conditioning systems, cold storage rooms, industrial fans, and hoisting devices.
The main usage for the 3-phase is AC units and electric cooktops and ovens. The rest of the electrical wiring in the house is distributed across the three phases to even out the load. Both are correct. The 3-phase breaker is just 3 separate 1-phase breakers with a handle physically connected so shutting off one shuts off all.
In virtually all USA locations, separate uses of each phase allows either breaker setup, while use of all 3 phases on the same device requires the 3-phase common handle breaker. The 3 separate breakers would be more convenient with 3 separate circuits since you won't turn so much off if one of them goes off.
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