Vacuum Interrupters

Vacuum Interrupters for Circuit Breaker Applications
Rated parameters required for vacuum interrupters

№	Parameter item	Unit	Value
1	Rated voltage	kV	12
2	Rated power-frequency withstanding voltage	kV	42*
3	Rated lighting impulses withstanding voltage	kV	75*
4	Rated frequency	Hz	50
5	Rated current	A	630
6	Rated peak withstanding current	kA	50
7	Rated short-time withstanding current	kA	20
8	Rated duration of short-circuit	s	4
9	Rated short-circuit breaking current	kA	20
10	Rated short-circuit making current	kA	50
11	Operations of short-circuit breaking current interruption	Time	30
12	Rated operating sequence		O-0.3s-CO-180s-CO
13	Rated single capacitor bank breaking current	A	400
14	Mechanical life	Time	10000
* In transformer oil or equivalent insulation medium

Mechanical parameters of vacuum interrupter

№	Parameter item	Unit	Value
1	Rated contact gap	mm	9±1
2	Contact closing force due to bellows and atmosphere	N	80±50
3	Counterforce of contact	N	120±50
4	Circuit resistance at low limit of rated contact force	μΩ	≤40
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	0.35

Mechanical parameters of Vacuum Interrupters for Circuit Breaker Applications

№	Parameter item	Unit	Value
1	Rated contact gap	mm	9±1
2	Contact closing force due to bellows and atmosphere	N	80±50
3	Counterforce of contact	N	120±50
4	Circuit resistance at low limit of rated contact force	μΩ	≤40
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	0.35