grammatical number - What is correct: "multiple restrike" or "multiple restrikes"? In general: should a noun after "multiple" be in singular or plural?

What is correct: "multiple restrike" or "multiple restrikes"? In general: should a noun after "multiple" be in singular or plural? (One "restrike" or more "restrikes" after each other can appear in circuit-breakers when breaking small capacitive currents.)