ZN85-40.5 type series high-voltage vacuum circuit breaker is suitable for indoor high-voltage switchgear with a rated voltage of 40.5KV and three-phase AC 50Hz. It is of a trolley-type structure used with KYN61-40 switchgear. ZN85-40.5 type series high-voltage vacuum circuit breaker is equipped with a reliable interlocking unit to meet the user's "five-proof" protection function, and the related supporting products are the isolation trolley, fuse trolley, fuse trolley with a thunderbolt, and PT trolley.