BKE Electric Company developed the circuit-breaker with permanent magnetism mechanism for vacuum circuit-breaker, a world-class breakthrough in the vacuum circuit-breaker technology. These switches using the permanent magnetism mechanism, with double coil to gain double stability have 12 A of instantaneous opening/closing current . Special material is used for the magnetic-iron to gain extra strength to absorb the impacts from opening / closing switches. The circuit-break will endure the sudden and impulsive forces in any instantaneous operations. The vacuum chamber for arc extinguishing on the top and the main circuit at the bottom are seamlessly integrated with epoxy resin. This simplistic mechanism offers an effective design with high insulation.

　　

· Compact design and pleasing appearance 　　· Little number of components, offering high mechanical reliability 　　· Expandable assembly, easily Integratable into distribution automation systems 　　· Low maintenance requirements 　　· Vacuum chamber for arch extinguishing sealed in epoxy resin, well insulated against impacts from ambient conditions 　　· Double coil and double stability magnetic mechanism offer operational reliability 　　· Easy to add remote controlling devices nsion.

　　

Item	Unit	Reference
Clearance Between Open Contacts	mm	630A	1250A
		9±1	11±1
Overtravel of Contacts	mm	3±1
Opening Speed	m/s	630A	1250A
		1.0±0.2	1.1±0.2
Closing Speed	m/s	0.6±0.2
Spring Time of Contact Closing	ms	≤2
Opening & Closing Insimultaneity of the Three Phase	ms	≤2
Electrified Circuit Resistance of Every Phase	μΩ	＜80
Closing Time	ms	30≥t≤75
Opening Time	ms	18≥t≤30

　　

Rated Voltage	12kV
Rated Frequency	50Hz
Rated Current	630～1250A
Rated Short-circuit Breaking Current	20、25、31.5 kA
Rated Peak Withstand Current	50、63kA
Rated Short-time Withstand Current	20、25kA
Rated Short-circuit Making Current	50、63 kA
Service Life	≥20000
Rated Current Breaking Times	≥10000
Rated Short-time Breaking Current Breaking Time	100
AC Withstand Voltage	42/48 kV
BIL	75/85 kV
Withstand Voltage of Second Circuit (1min)	2000 V
Mechanical Characteristics	85%～110%rated voltage can opening and closing reliably
	≤30%rated voltage can not opening and closing