That separates or disconnects. From Latin disiunctus ("disjointed"). 1 º _ is an electrical component that automatically cuts the power by current overload (Thermomagnetic circuit breaker), by leakage or electric shock (differential circuit breaker), or any other risky situation. 2nd _ in Orthodontics is a palatal expander that prevents maxillary compression. 3 º _ in grammar is a disjunctive connector, that joins two options excluding or alternatives in a sentence (like the conjunctions "U" and "O").
