IEC 60898-2-2016 pdf free

IEC 60898-2-2016 pdf free.Electrical accessories – Circuit-breakers for overcurrent protection for household and similar installations – Part 2: Circuit-breakers for AC and DC operation.
Clause 1 of IEC 60898-1:2015 is applicable except as follows:
Addition at the end of the first paragraph:
This standard gives additional requirements for single- and two-pole circuit-breakers whicn, in
addition to the above characteristics, are suitable for operation with direct current, and have a
rated DC voltage not exceeding 220 V for single-pole and 440 V for two-pole circuit-breakers,
a rated current not exceeding 125 A and a rated DC short-circuit capacity not exceeding
10 000 A.
NOTE This standard applies to circuit-breakers able to make and break both alternating current and direct current
Delete the last two paragraphs.
2 Normative references
Clause 2 of IEC 60898-1:2015 is applicable except as follows:
Addition:
IEC 60898-1:2015, Electrical accessories — Circuit-breakers for overcurrent protection for
household and similar installations — Part 1: Circuit-breakers for a.c. operation 3 Terms and definitions
Clause 3 of IEC 60898-1:2015 is applicable except as follows:
Addition:
3.5.10.3 time constant T rise time of a prospective direct current to reach a value of 0.63 times the maximum peak current T UR(ms)
4 Classification
Clause 4 of IEC 60898-1:2015 is applicable except as follows:
4.2 According to the number of poles:
Replacement:
— single-pole circuit-breakers:
— two-pole circuit-breakers with two protected poles.
4.6 According to the instantaneous tripping current (see 3.5.17) Delete D-Type.
Addition:
4.8 According to the time constant
— circuit-breakers suitable for DC circuits with a time constant of T < 4 ms:
— circuit-breakers suitable for DC circuits with a time constant of T< 15 ms.
NOTE It is assumed that short-circuit currents of 1 500 A are not exceeded in installations in which, due to the loads connected, time constants in normal service up to 15 ms can occur. Where higher short-circuit currents can occur, the time constant of T -4 ms Is considered sufficient.
5 Characteristics of circuit-breakers
Clause 5 of IEC 60898-1:2015 is applicable except as follows:
5.3.1 Preferred values of rated voltage
Replacement:
The preferred values of rated voltage are given in Table 1.
Examples of connections of circuit-breakers in DC systems are given in Figure 18.IEC 60898-2 pdf free download.