Vacuum Interrupters

TD-12/4000-50BQ Vacuum Interrupters for Circuit Breaker Applications
Rated parameters of vacuum interrupter

№	Parameter item	unit	value
1	Rated voltage	kV	12
2	Rated Short-time power-frequency withstanding voltage	kV	48
3	Rated lighting impulses withstanding voltage	kV	85
4	Rated frequency	Hz	50
5	Rated current	A	4000
6	Rated peak withstanding current	kA	125
7	Rated short-time withstanding current	kA	50
8	Rated duration of short-circuit	s	4
9	Rated short-circuit breaking current	kA	50
10	Rated short-circuit making current	kA	125
11	Breaking times of short-circuit current	Times	20
12	Rated operating sequence		O-0.3s-CO-180s-CO
13	Rated single capacitor bank breaking current	A	630
14	Mechanical life	Times	10000

Mechanical parameters of vacuum interrupter:

№	Parameter item	Unit	Value
1	Rated contact gap	mm	9±1 *
2	Contact closing force	N	250±60
3	Counterforce of contact	N	340±60
4	Circuit resistance at low limit of rated contact force	μΩ	≤10
5	Contact erosion permission length	mm	3
6	Moving part weight	kg	3.5
*In special conditions the mechanical performance won′t be affected when contact distance is of 6～12mm

Mechanical parameters of vacuum interrupter for Circuit Breaker Applications

№	Parameter item	Unit	Value
1	Average breaking speed	m/s	1.1±0.2
2	Average closing speed	m/s	0.6±0.2
3	Rated operation pressure of contact	N	7500±500
4	Bounce duration of contact closing	ms	≤2
5	Rebound amplitude of breaking contact	mm	≤2
6	Out of simultaneity of contact closing and breaking	ms	＜1