This is an irregular verb. It follows the conjugation pattern of the verb escoger.
PresentPresente
Este abrigo protege bien del frío.
This coat protects well against the cold.
ImperfectPretérito imperfecto
El perro protegía la casa por las noches.
The dog protected the house at night.
Present SubjunctivePresente de subjuntivo
Quiero que la ley proteja a los animales.
I want the law to protect animals.