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Rated ultimate short-circuit breaking capacity (Icu)

The rated ultimate short-circuit breaking capacity of a circuit-breaker is the

maximum short-circuit current value which the circuit-breaker can break twice

(in accordance with the sequence O – t – CO), at the corresponding rated

operational voltage. After the opening and closing sequence the circuit-breaker

is not required to carry its rated current.

Rated service short-circuit breaking capacity (Ics)

The rated service short-circuit breaking capacity of a circuit-breaker is the

maximum short-circuit current value which the circuit-breaker can break three

times in accordance with a sequence of opening and closing operations (O - t

- CO - t – CO) at a defined rated operational voltage (Ue) and at a defined

power factor. After this sequence the circuit-breaker is required to carry its

rated current.

Rated short-time withstand current (Icw)

The rated short-time withstand current is the current that the circuit-breaker in

the closed position can carry during a specified short time under prescribed

conditions of use and behaviour; the circuit-breaker shall be able to carry this

current during the associated short-time delay in order to ensure discrimination

between the circuit-breakers in series.

Rated short-circuit making capacity (Icm)

The rated short-circuit making capacity of an equipment is the value of shortcircuit making capacity assigned to that equipment by the manufacturer for the

rated operational voltage, at rated frequency, and at a specified power-factor

for ac.

Utilization categories

The utilization category of a circuit-breaker shall be stated with reference to

whether or not it is specifically intended for selectivity by means of an intentional

time delay with respect to other circuit-breakers in series on the load side,

under short-circuit conditions (Table 4 IEC 60947-2).

Category A - Circuit-breakers not specifically intended for selectivity under

short-circuit conditions with respect to other short-circuit protective devices in

series on the load side, i.e. without a short-time withstand current rating.

Category B - Circuit-breakers specifically intended for selectivity under shortcircuit conditions with respect to other short-circuit protective devices in series

on the load side, i.e. with and intentional short-time delay provided for selectivity

under short-circuit conditions. Such circuit-breakers have a short-time withstand

current rating.