TD-12/1250-25, TD-12/1250-25N vacuum arc extinguishing chamberDetailed product description：

Product Overview:

TD-12/1250-25 and TD-12/1250-25N vacuum arc extinguishing chambers are equipped with corrugated ceramic shells, copper chromium contacts, and cup-shaped longitudinal magnetic field structures. It has the advantages of large interruption capacity, high insulation level, strong arc extinguishing ability, long service life, small size, simple maintenance, no explosion hazard, no pollution, and low noise. The indoor vacuum circuit breaker assembled with it is used for control and protection in the transmission and distribution systems of power, machinery, chemical, metallurgical, mining, railway and other departments. Especially suitable for places with frequent operations.

Main technical parameters of vacuum arc extinguishing chamber

parameter item	unit	parameter
rated voltage	kV	twelve
rated current	A	one thousand two hundred and fifty
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-five
Rated peak withstand current	kA	sixty-three
Rated short-circuit closing current	kA	sixty-three
Rated short-time withstand current	kA	twenty-five
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	140±50
Contact reaction force	N	240±50
Circuit resistance at lower limit of rated contact pressure	uΩ	≤25
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 point one five
Quality of vacuum arc extinguishing chamber	kg	four

Mechanism characteristics and parameters of vacuum switch equipment for TD-12/1250-25 and TD-12/1250-25N vacuum arc extinguishing chambers

parameter item	unit	parameter
contact gap	mm	11±1
Average opening speed	m/s	1.1±0.2
Average closing speed	m/s	0.6±0.2
Rated contact pressure	N	2500±200
Contact closing bounce time	ms	≤2
Non synchronous closing and opening of contacts	ms	≤2
Rebound amplitude of the opening contact	mm	≤2