IEC 60898-2:2016.Electrical accessories – Circuit-breakers for overcurrent protection for household and similar installations – Part 2: Circuit-breakers for AC and DC operation.
IEC 60898-2:2016 gives additional requirements for single- and two-pole circuit-breakers which, 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.
9.12.8 Interpretation of records
Replacement.
9.12. 8.1 Interpretation of records in case of AC voltage
a) Determination of the applied and power frequency recovery voltages
The applied and power frequency recovery voltages are determined from the record corresponding to the opening operation O, (see 9 12. 11.)made with the apparatus under est and estimated as indicated in Figure 6a. The voltage on the supply side shall be measured during the first cycle after arc extinction in all poles and after high frequency phenomena have subsided.
b)Determination of the prospective short-circuit current.
The AC component of the prospective current is taken as being equal to the r.m.s. value of the AC component of the calibration current(values corresponding to A, of Figure 6a) Where applicable, the prospective short-circuit current shall be the average of the prospective currents in all the phases.
9.12.8.2 Interpretation of records in case of DC voltage
a )Determination of the applied voltage and the recovery voltage
The applied voltage and the recovery voltage are determined from the record taken during the break test. The voltage on the supply side shall be measured after arc extinction and after high frequency phenomena have subsided.
9.12.11.3 Test at1500a
Replacement of the first two paragraphs by the following paragraphs
For circuit-breakers having rated short-circuit capacity of 1 500 A, the test circuit is calibrated according to 9. 12.7.1 and 9. 12.7.2, to obtain a current of 1 500 A at a power factor corresponding to this current according to Table 17.
r direct current the time constant is calibrated corresponding to the assigned time constant.
For circuit-breakers having rated short-circuit capacity exceeding 1 500 A, the test circuit is calibrated according to 9. 12.7.1 and 9 12.7.3, at a power factor corresponding to 1 500 A according to Table 17.IEC 60898-2:2016 pdf download.
For direct current the time constant is calibrated corresponding to the assigned time constant.