Required definitions, ratings, procedures for performing design tests and production tests, and construction requirements for pad-mounted, dry vault, submersible, and overhead fault interrupters for alternating current systems up to and including 38 kV are provided in this standard.

This standard applies to all pad-mounted, dry vault, submersible, and overhead single- or multi-pole alternating current fault interrupters (FIs) for rated maximum voltages above 1000 V and up to and including 38 kV. Devices that require a dependent manual operation are not covered by this standard.

The purpose of this standard is to define the rating structure, preferred ratings, test, and construction requirements for pad-mounted, dry vault, submersible, and overhead single- or multi-pole alternating current FIs for maximum voltages above 1000 V and up to and including 38 kV.