ZW8 Vacuum arc extinguishing chamber (ZW8 dedicated)Detailed product description：

Overview:
BD-12/630-20, TD-12/630-20W vacuum arc extinguishing chamber (ZW8 specific) is a miniaturized product, using copper chromium contact material, cup-shaped longitudinal magnetic field structure, and glass or ceramic as insulation shell. The product has the characteristics of small size, large breaking capacity, and high pressure resistance. Paired with corresponding outdoor vacuum circuit breakers or vacuum distribution devices, it can be widely used in places where circuits are frequently operated in industrial sectors such as power, machinery, chemical, metallurgical, mining, etc.

BD-12/630-20, TD-12/630-20W vacuum arc extinguishing chamber (ZW8 specific) main technical parameters

parameter item	unit	parameter
rated voltage	kV	twelve
rated current	A	six hundred and thirty
rated frequency	Hz	fifty
Short term (1-minute) power frequency withstand voltage	kV	forty-two
Lightning impulse withstand voltage	kV	seventy-five
Rated short-circuit breaking current	kA	twenty
Rated peak withstand current	kA	fifty
Rated short-circuit closing current	kA	fifty
Rated short-time withstand current	kA	twenty
Rated short-circuit duration	S	four
Rated breaking current of a single capacitor bank	A	six hundred and thirty
Rated back-to-back capacitor bank breaking current	A	four hundred
Rated operating sequence		Fen-0.3S-180S-Fen
Rated short-circuit breaking current breaking times	time	thirty
mechanical life	time	ten thousand
Contact self closing force	N	95±35
Contact reaction force	N	215±40
Circuit resistance at lower limit of rated contact pressure	uΩ	≤30
Thickness of allowable wear of contacts	mm	three
Gas pressure inside the vacuum arc extinguishing chamber	Pa	≤1×10
Quality of the sports section	kg	one
Quality of vacuum arc extinguishing chamber	kg	three

The mechanism characteristics and parameters of the vacuum switch equipment matched with the product

parameter item	unit	parameter
contact gap	mm	8±
Average opening speed	m/s	1.1±0.2
Average closing speed	m/s	0.6±0.2
Rated contact pressure	N	2000±200
Contact closing bounce time	ms	≤2
Non synchronous closing and opening of contacts	ms	≤2
Rebound amplitude of the opening contact	mm	≤2