630a20ka Vacuum Circuit Breaker

TD-12/630-20C3
Main Technical Specification
序号	Parameter name	（Unit）	（Value）
1	Rated frequency	Hz	50
2	Rated Voltage	kV	12
3	Rated short-time（1min） power-frequency withstand voltage	kV	48★
4	Rated lightning impulse withstand voltage（Peak）	kV	85★
5	Rated Current	A	630
6	Rated short-circuit breaking current	kA	20/25
7	Rated short-circuit making current	kA	50/63
8	Rated short-time withstand current	kA	20/25
9	Rated peak withstand current	kA	50/63
10	Breakding operations of rated short circuit breaking current	Times	30
11	Circuit resistance at lowest rated contact force	μΩ	≤25
12	Rated duration of short-circuit	s	4
13	Closing force due to bellow and atmosphere	N	80±30
14	Force required to hold contacts open at full stroke	N	100±40
15	Mechanical endurance	Times	10000
16	Contacts limit erosion	mm	3
17	Storage life	years	20
（Mechanical date of matching switchgear）
1	Clearance between open contacts	mm	9±1
2	Average opening speed (0～75% contact gap)	m/s	1.1±0.2
3	Average closing speed(30% contact gap-contact close position)	m/s	0.7±0.2
4	Rated added external contact final force	N	1800±100
4	Rated added external contact final force	N	1800±100
5	Contact bouncing duration at closing operation	ms	≤2
6	Closing and Opening non-simultaneity of three-phase contacts	ms	≤1
7	Maximum Rebound during opening	mm	≤2
	Meets or exceeds the electrical endurance requirements of class E2 for autoreclosing duty per IEC 62271-100 and GB1984-2014

	Note：“★”Within transformer oil or equivalent isolation medium