DSRF180A 57310255-AV ABB distributed control system industrial DCS module card

Description

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This part of IEC/EN 60898 applies for a.c. airbreak circuit-breakers for operation at 50 Hz or 60 Hz,
having a rated voltage not exceeding 440 V (between
phases), a rated current not exceeding 125 A and a rated
short-circuit capacity not exceeding 25.000 A.
As far as possible, it is in line with the requirements
contained in IEC/EN 60947-2.
Rated short-circuit capacity (Icn)
The rated short-circuit capacity of a circuit-breaker is the
value of the ultimate short-circuit breaking capacity
assigned to that circuit-breaker by the manufacturer.
The sequence of operations shall be: O – t – CO.*
Service short-circuit capacity (Ics)
A circuit-breaker having a given rated short-circuit
capacity has a corresponding fixed service short-circuit
capacity (Ics). This is therefore generally not indicated.
Rated operational voltage (Un)
The rated voltage of a circuit-breaker is the value of voltage,
assigned by the manufacturer, to which its performance
(particularly the short-circuit performance) is referred.
The same circuit-breaker may be assigned a number of rated
voltages and associated rated short-circuit capacities.
2The voltage which appears across the terminals of a pole of
a circuit-breaker after the breaking of the current.
The value of the power frequency recovery voltage shall be
equal to 110% of the rated voltage of the circuit-breaker under test.