Deals with characteristics, design and construction, type and routine tests of single-pole and multi-pole moulded-case circuit-breakers, including those which incorporate replaceable current-limiting fuses, for interrupting ratings of 10 kA and above. It may also be used to verify the breaking capacity of moulded-case circuit-breakers within interrupting ratings of 3 kA to 10 kA, which otherwise fall within the scope of AS 3111. Additional requirements may apply to miniature overcurrent circuit-breakers in approvals regulations.