scope:

This specification covers protective relays and attachments used with medium voltage vacuum circuit breakers for shipboard use.

Classification. Protective relays are of the following types, as specified (see 6.2).

a. Type I - Type I protective relays are hard-mounted (without shock isolators) within a hard-mounted switchboard.

b. Type II - Type II protective relays are installed on shock isolators within a hard-mounted switchboard or hard-mounted within a shock isolated switchboard.

intended Use:

Protective relays covered by this specification are used to control vacuum circuit breakers.