EVH1-24/1250-31.5kV Indoor vacuum circuit breakerDetailed product description：

The EVH1-24/T1250-31.5 vacuum circuit breaker is an indoor device with a rated voltage of 12kV and a three-phase AC frequency of 50Hz. It can be used for controlling and protecting electrical facilities in industrial and mining areas, enterprises, power plants, and substations. This product complies with the relevant provisions of GB1984-2003 "High Voltage AC Circuit Breakers", JB3855 "Indoor High Voltage AC Vacuum Circuit Breakers", DL403 "Technical Conditions for Ordering 10-35kV Indoor High Voltage Vacuum Circuit Breakers" and IEC62271-100:2001 "High Voltage AC Circuit Breakers".
The EVH1-24/T1250-31.5 series indoor high-voltage vacuum circuit breaker can be installed in both mobile and fixed switchgear. This circuit breaker has the advantages of long service life, simple maintenance, no pollution, no explosion hazard, low noise, and is suitable for harsh working conditions such as frequent operation.

Product Structure Features
The EVH1-24/T1250-31.5 vacuum circuit breaker arranges the arc extinguishing chamber and the operating mechanism on a shared frame, that is, an integrated layout. This structural design can make the operating performance of the operating mechanism more in line with the required performance of the arc extinguishing chamber opening and closing, reduce unnecessary intermediate transmission links, lower energy consumption and noise, and make the operating performance of the circuit breaker more reliable. The EVH1-24/T1250-31.5 indoor high-voltage vacuum circuit breaker can be installed in both mobile and fixed switchgear.
The main circuit of the circuit breaker adopts a structure in which a vacuum arc extinguishing chamber is sealed inside the insulated pole. The vacuum arc extinguishing chamber is longitudinally sealed inside a tubular insulation cylinder, which is cast using epoxy resin technology. This structural design not only prevents the vacuum arc extinguishing chamber from being damaged by external factors, but also ensures that it can exhibit high resistance to voltage effects even in humid, hot, and severely polluted environments.
The operating mechanism is an independent spring energy storage type, with manual and electric energy storage functions. The operating mechanism is placed inside the chassis in front of the arc extinguishing chamber and has a clamp plate structure.

Technical parameters of EVH1-24/1250-31.5kV indoor vacuum circuit breaker

serial number	Name		unit	Numerical value
one	rated voltage		kV	twenty-four
two	Rated insulation level	1-minute power frequency withstand voltage	kV	65
		Impulse withstand voltage (peak value)		125
three	rated current		A	one thousand two hundred and fifty
four	Rated short-circuit breaking current		kA	thirty-one point five
five	Rated short-circuit closing current (peak)			80
six	Rated peak withstand current			eighty
seven	Rated short-time withstand current			thirty-one point five
eight	Electrical lifespan		time	thirty
nine	Rated short-circuit current duration		s	four
ten	Rated operating sequence			Min-0.3s HeFen-180s HeFen
eleven	mechanical life		time	10000
twelve	Rated breaking current of a single capacitor bank		A	six hundred and thirty
thirteen	Rated back-to-back capacitor bank breaking current		A	four hundred