DSRF182AK02 ABB distributed control system industrial DCS module card

Description

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IEC/EN 60947-2
This part of the IEC/EN 60947 applies to circuit-breakers,
the main contacts of which are intended to be connected to
circuits, the rated voltage of which does not exceed 1.000
V a.c. or 1.500 V d.c..
It applies whatever the rated currents, the method of
construction or the proposed applications of the circuitbreakers may be.
The circuit-breakers are designed for use by instructed
people.
Rated ultimate short-circuit breaking capacity Icu
The rated ultimate short-circuit breaking capacity of
a circuit-breaker is the value of ultimate short-circuit
breaking capacity assigned to that circuit-breaker by the
manufacturer for the corresponding rated operational
voltage. It is expressed as the value of the prospective
breaking current, in kA (r.m.s. value of the a.c. component
in the case of a.c.).
The sequence of operations shall be: O – t – CO.*
Rated service short-circuit breaking capacity Ics
The rated service short-circuit breaking capacity of a circuitbreaker is the value of service short-circuit breaking
capacity assigned to that circuit-breaker by the
manufacturer for the corresponding rated operational
voltage. It is expressed as a value of prospective breaking
current, in kA, corresponding to one of the specified
percentages of the rated ultimate short-circuit breaking
capacity and rounded up to the nearest whole number.
It may be expressed as a % of Icu (for example Ics = 25% Icu).
The sequence of operations shall be: O – t – CO – t – CO.*
* The following symbols are used for defining
the sequence of operatons:
O represents an opening operation.
CO represents a closing operation followed by an automatic opening.
t represents the time interval between two short-circuit operations.