Description:
Vacuum switching tubes for breaker should be capable to break short circuit current, which is used in circuit and electric equipment for over loading and short circuit protection, normally needn't frequently operate. It can break rated short circuit current more than 30 times.

Product Details Introduction

Main Technical Specification
Rated Voltage(kV)		12
Rated Current(A)		1250
Rated Frequency(HZ)		50/60
Rated short-circuit breaking Current(kA)		25
Rated short-circuit making Current(kA)		80
Rated peak withstand current(kA)		80
Rated short-time withstand current(KA)		31.5
Rated duration of short-circuit(S)		4
Rated short-time(1min) power-frequency withshand voltage(kV)		42
Lightning impulse withstand voltage(KV)		75
Rated operating sequence		O--0.3S--CO--180S--CO
Circuit resistance at lowest rated contact force(μΩ)		≤20
Breaking operations of rated short circuit breaking current(Times)		≥30
Mechanical endurance(Times)		10,0000
Storage life(years)		≥20
Contacts limit erosion(mm)		3
Closing force due to bellow and atmosphere(N)		130±50
Counterforce of Contacts at Full Stroke(N)		220±50
Weight of movable parts(Kg)		0.88
MECHANICAL DATA of  VACUUM SWITH EQUIPPED  with the INTERRUPTERS	Clearance between open contacts(mm)	10±1
	Overtravel(mm)	3
	Average opening speed(average of first 75% of contact gap)(m/s)	1.1±0.2
	Average clising speed(average of last 30% of contact gap) (m/s)	0.6±0.2
	Rated added external contact final force(N)	3100±200
	Contact bouncing duration at closing operation (ms)	≤2
	Closing and Opening non-simultaneity of three-phase Contacts(ms)	≤2
	Maximum Rebound during opening(mm)	≤2
	Maximum Overtravel during opening (mm)	≤2