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PFSK160A 3BSE009514R1 ABB Online hot sale of robot system spare parts
PFSK160A 3BSE009514R1 ABB Online hot sale of robot system spare parts
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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.
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