IEC 60898-2:2003 pdf download.Circuit-breakers for overcurrent protection for household and similar installations
1 Scope and object
This clause of Part 1 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 which, in addition to the above characteristics, are suitable for operation with direct current, and have a rated d.c. 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 d.c. short-circuit capacity not exceeding 10 000 A.
NOTE This standard applies to circuit-breakers able to make and break both a.c. current and d.c. current.
Delete the last two paragraphs.
4.7 According to the time constant
- Circuit-breakers suitable for d.c. circuits with a time constant of T≤4 ms.
- Circuit-breakers suitable for d.c. 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 may occur, the time constant of T = 4 ms is considered sufficient.
6 Marking and other product information
Clause 6 of Part 1 applies with the following modifications:
Replacement:
c) rated a.c. voltage with the symbol ~ and rated d.c. voltage with the symbol
d) replace(B, C orD) by(B or C).
f) rated short-circuit capacity for a.c. and d.c. in amperes in one rectangle, without the symbol A，if valid for both a.c. and d.c. (see example 1 below). If the rated short-circuit capacity is different for a.c. and d.c. this shall be indicated in two adjacent rectangles,without the symbol A, with the symbol ~ near the rectangle containing the a.c. value and with the symbol near the rectangle containing the d.c. value (see example 2 below).
Addition:
I) time constant T15 within a rectangle, if applicable, associated with the marking for the short-circuit capacity at the time constant of 15ms (see example 3 below).
Replacement of the first paragraph following ):
If, for small devices, the space available does not allow all the above data to be marked, at least the information under C) and d) shall be marked and visible when the circuit-breaker is installed.
8.8 Performance at short-circuit currents
Replacement of the third paragraph:It is required that circuit-breakers be able to make and to break any value of current up to and including the value corresponding to the rated short-circuit capacity at rated frequency, at a power-frequency recovery voltage equal to 105 % (±5 %) of the rated operational voltage and at any power factor not less or any time constant not greater than the appropriate limit of the range stated in 9.12.5; it is also required that the corresponding values of 12t lie below the l2t characteristic (see 3. 5.13).IEC 60898-2 pdf download.