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Contact load in amperes for heaters (AC1) and motors (AC3) can be found directly on the contactor. The "Utilization category" are mainly categorized in IEC 60947 in the following volume: Volume 1: General requirements; Volume 2: Circuit-breakers; Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units
Circuit breakers are manufactured with standard ratings, using a system of preferred numbers to create a useful selection of ratings. A miniature circuit breaker has a fixed trip setting; changing the operating current value requires replacing the whole circuit breaker.
IEC 62146 Grading capacitors for high-voltage alternating current circuit-breakers; IEC 62148 Fibre optic active components and devices – Package and interface standards; IEC 62149 Fibre optic active components and devices – Performance standards; IEC 62150 Fibre optic active components and devices – Test and measurement procedures
The standard includes preferred current ratings and wire gauges for both International (deemed Series I) and North American (deemed Series II) applications. Series I preferred current ratings (in amps) are: 16, 32, 63, 125, 250, 400, 630 and 800, with wire gauges specified as mm 2.
Schematic representation of measurement categories. Measurement category is a method of classification by the International Electrotechnical Commission (IEC) [1] of live electric circuits used in measurement and testing of installations and equipment, usually in the relation within a building (residential or industrial).
Also known as reclosers or autoreclosers, ACRs are essentially rated circuit breakers with integrated current and voltage sensors and a protection relay, optimized for use as a protection asset. Commercial ACRs are governed by the IEC 62271-111/IEEE Std C37.60 and IEC 62271-200 standards.