配線 はいせん よう遮断 しゃだん なら
haisen'yōshadankinara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 配線用遮断器

1. If/when it's a circuit breaker for wiring…; If/when it’s a wiring-use circuit breaker…

Nara Conditional
Electrical Engineering