IEC 60898-2:2003 pdf free download

IEC 60898-2:2003 pdf free download
IEC 60898-2:2003 pdf free download.Circuit-breakers for overcurrent protection for household and similar installations
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 I 2 t lie below the I 2 t characteristic (see 3.5.13).
9.1 0.2.2 For circuit-breakers of the B-type
An alternating current equal to 3 I n
is passed through all poles, starting from cold. The opening time shall be not less than 0,1 s and not more than:
– 45 s for rated currents up to and including 32 A;
– 90 s for rated currents above 32 A.
An alternating current equal to 5 I n is then passed through all poles, starting from cold.
The circuit-breaker shall trip in a time less than 0,1 s.
A direct current equal to 4 I n is passed through all poles, starting from cold.
The opening time shall be not less than 0,1 s and not more than:
– 45 s for rated currents up to and including 32 A;
– 90 s for rated currents above 32 A.
A direct current equal to 7 I n is then passed through all poles, starting from cold.
The circuit-breaker shall trip in a time less than 0,1 s.
9.1 0.2.3 For circuit-breakers of the C-type
An alternating current equal to 5 I n is passed through all poles, starting from cold.
The opening time shall be not less than 0,1 s and not more than:
– 15 s for rated currents up to and including 32 A;
– 30 s for rated currents above 32 A.
An alternating current equal to 10 I n is then passed through all poles, starting from cold.
The circuit-breaker shall trip in a time less than 0,1 s.