Vacuum Interrupters

TD-12/1250-31.5VE Vacuum Interrupters for Circuit Breaker Applications
Rated parameters of vacuum interrupter

№	Parameter item	Unit	Value
1	Rated voltage	kV	12
2	Rated power-frequency withstanding voltage	kV	48
3	Rated lighting impulses withstanding voltage	kV	85
4	Rated frequency	Hz	50
5	Rated current	A	1250
6	Rated peak withstanding current	kA	80
7	Rated short-time withstanding current	kA	31.5
8	Rated duration of short-circuit	s	4
9	Rated short-circuit breaking current	kA	31.5
10	Rated short-circuit making current	kA	80
11	Breaking times of short-circuit curren	Time	50
12	Rated operating sequence		O-0.3s-CO-180s-CO
13	Rated single capacitor bank breaking current	A	630
14	Mechanical life	Time	10000

Mechanical parameters

№	Parameter item	Unit	Value
1	Rated contact gap	mm	9±1
2	Contact closing force due to bellows and atmosphere	N	120±50
3	Counterforce of contact	N	200±50
4	Circuit resistance at low limit of rated contact force	μΩ	≤20
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	1.2

Mechanical parameters of Vacuum Interrupters for Circuit Breaker Applications

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	1.3±0.2
2	Average closing speed	m/s	0.6±0.2
3	Rated operation pressure of contact	N	2600±100
4	Bounce duration of contact closing	ms	≤2
5	Rebound amplitude of breaking contact	mm	≤1.5
6	Out of simultaneity of contact closing and opening	ms	＜1