ZN12-40.5 series indoor vacuum circuit breakerDetailed product description：

The ZN12 indoor vacuum circuit breaker is suitable for 35kV three-phase AC 50Hz power systems. The arc chamber of this circuit breaker is made of ceramic structure and adopts longitudinal magnetic field contacts. It has a small volume, and the diffusion arc current generated during disconnection is uniformly distributed on the contacts, without local melting phenomenon. It also has low arc energy voltage (20-200V) and low current cutoff value (4-5A), and is equipped with a highly reliable operating mechanism.

The ZN12-40.5 series indoor vacuum circuit breaker adopts the DYT-1 spring energy storage mechanism, which can be operated by AC energy storage supporting DC or manually operated. This circuit breaker adopts special contact materials, which enable the arc extinguishing chamber to have a high breaking capacity and a long electrical life.

This circuit breaker has a simple structure, strong breaking capacity, long service life, complete operating functions without explosion hazards, and simple maintenance. It is suitable for controlling or protecting switches in power plants, substations and other distribution systems, especially for breaking important loads and frequent operation places.

Main technical parameters of ZN12-40.5 series indoor vacuum circuit breaker

serial number	project		unit	Technical Specifications
one	rated voltage		kV	forty point five
two	rated current		A	one thousand two hundred and fifty		one thousand and six hundred	two thousand
three	Rated short-circuit breaking current		kA	twenty	thirty-one point five	twenty-five	thirty-one point five
four	Dynamic stability current (peak value)		kA	fifty	eighty	sixty-three	eighty
five	4S thermal stability current		kA	twenty	thirty-one point five	twenty-five	thirty-one point five
six	Rated short-circuit closing current (peak)		kA	fifty	eighty	sixty-three	eighty
seven	Rated short-circuit current breaking times		time	twenty
eight	Rated operating sequence			0-03s-C0-180s-C0
nine	Rated Absolute Edge level	1-minute power frequency withstand voltage	kA	ninety-five
		Lightning impulse withstand voltage (peak value)		one hundred and eighty-five
ten	mechanical life		time	ten thousand
eleven	Rated opening and closing current of a single capacitor bank		A	six hundred and thirty
twelve	Rated back-to-back capacitor bank current		A	four hundred
thirteen	Rated voltage of energy storage motor		V	AC、DC：110； two hundred and twenty
fourteen	Rated power of energy storage motor		W	two hundred and seventy-five
fifteen	Energy storage time of energy storage motor		S	≤15
sixteen	Rated voltage of the closing and opening coil		V	AC、DC：110； two hundred and twenty
seventeen	Rated current of closing and opening coil		A	1.91 (AC), 0.89 (DC)
eighteen	Rated current of overcurrent release device		A	five
nineteen	Contact opening distance		mm	25±2
twenty	Contact stroke of contacts		mm	6±2
twenty-one	Three phase separation with different phases		ms	≤2
twenty-two	Contact closing bounce time		ms	≤3

ZN12-40.5 series indoor vacuum circuit breaker appearance and installation dimensions

	L	L1	L2
ZN72-40.5	three hundred and fifty	eight hundred	eight hundred and thirty
ZN-40.5	four hundred and sixty	one thousand one hundred and twenty-eight	one thousand one hundred and seventy-five

ZN12-40.5 series indoor vacuum circuit breaker