This International Standard applies to electromechanical air break contactors for householdand similar purposes provided with main contacts intended to be connected to circuits the rated voltage of which does not exceed 440 V a.c. (between phases) with rated operational currents less than or equal to 63 A for utilization category AC-7a and 32 A for utilization categories AC-7b and AC-7c, and rated conditional short-circuit current less than or equal to 6 kA.The contactors dealt with in this standard are not normally designed to interrupt short-circuitcurrents. Therefore, suitable short-circuit protection (see 9.3.4) shall form part of the installation.This