KNB5-125 Series 125A AC Miniature Circuit Breaker

KNB5-125 Series 125A AC Miniature Circuit Breaker

KNB5-125 series Miniature Circuit Breaker is nice in appearance, reasonable in structure, sound in feature and high in breaking capacity. Installed with standard din rail, it is convenient and easy in usage. It is mainly used in the line of AC 50/60Hz, rated working voltage to 240V/415V, and rated current to 125A as protection against overload and short-circuit. It can be used as infrequent on-and-off operation and changeover. It complies with standard of IEC60898-1 and IEC60947-2.

Technical parameter

Frame class	125A
Rated working voltage	240/415V
Rated frequency	50/60Hz
Rated working current	63, 80, 100, 125
Making and breaking capacity	10KA(63,80,100A), 6KA(125A)
Release type	B, C, D
Poles	1, 2, 3, 4P
Mechanical life	20000
Electric life	2000

The over-current tripping unit protection feature

Sequence NO.	Release	Test current I/In		Start state	Tripping time		Expected result
Sequence NO.	Release	IEC60898-1	IEC60947-2	Start state	IEC60898-1	IEC60947-2	Expected result
1	C、D	1.13In	1.05In	Cold state	t≤1h(In≤63A) t≤2h(In>63A)	t≤1h(In≤63A) t≤2h(In>63A)	Not tripping
2	C、D	1.45In	1.3In	Start right after the serial NO. 1 test	t<1h(In≤63A) t<2h(In>63A)	t<1h(In≤63A) t<2h(In>63A)	Tripping
3	C、D	2.55In	—	Cold state	1s<t<60s (In≤32A) 1s<t<120s (In>32A)		Tripping
4	C D	5In 10In	8In	Cold state	t≤0.1s	t≤0.2s	Not tripping
5	C D	10In 20In	12In	Cold state	t<0.1s	t<0.2s	Tripping