Vacuum Interrupters

TJC-7.2/400-4C Vacuum interrupter
Rated parameters of vacuum interrupter

№	Parameter item		Unit	Value
1	Rated voltage		kV	7.2
2	Rated power-frequency withstanding voltage		kV	32
3	Rated lighting impulses withstanding voltage		kV	65
4	Rated frequency		Hz	50
5	Rated current		A	400
6	Rated short-time withstanding current		kA	4
7	Rated duration of short-circuit		s	4
8	Rated breaking current, max		kA	3.2
9	Rated breaking current, min		A	80
10	Rated making current	AC-3	kA	3.2
		AC-4		4
11	Limited breaking current		kA	4
12	Working mode			Long-term duty type
13	Types			AC-3 AC-4
14	Electricity endurance	AC-3	Times	400000
		AC-4		300000
15	Mechanical life		Times	500000

Mechanical parameters of vacuum interrupter:

№	Parameter item	Unit	Value
1	Rated contact gap	mm	4
2	Contact closing force due to bellows and atmosphere	N	75±30
3	Counterforce of contact	N	100±30
4	Circuit resistance at contact force from atmosphere pressure	μΩ	≤150
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	0.3

Mechanical parameters of Vacuum Interrupters for Contactor Applications

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	0.7±0.3
2	Average closing speed	m/s	0.3±0.1
3	Rated operation pressure of contact	N	110±10
4	Bounce duration of contact closing	ms	≤2
5	Rebound amplitude of breaking contact	mm	≤2
6	Out of simultaneity of contact closing and opening	ms	＜1