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DingzhouVZ4-12 Type Vacuum Circuit Breaker

The VZ4-12 vacuum circuit breaker is a high-voltage electrical apparatus used in power systems, characterized by reliable insulation performance and efficient electrical breaking capability. As a high-voltage switchgear, the VZ4-12 vacuum circuit breaker is suitable for 50 Hz AC power systems with a rated voltage of 12 kV and is employed for the control and protection of loads in electrical circuits.

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DingzhouCircuit breaker

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Product Description

　　Product Definition

　　 Scope of Application and Advantages

　　Its main advantages include compact size, light weight, ease of operation, high reliability, and simple maintenance. In addition, it exhibits excellent durability and electrical performance, capable of withstanding transient overcurrents and short-circuit currents under abnormal conditions, thereby ensuring the normal operation of power systems. In summary, the VZ4-12 vacuum circuit breaker is a highly efficient and reliable electrical device widely used in power, metallurgy, petrochemical, and other industries.

　　Main Technical Parameters of the Product

Serial Number	Name		Unit	Value
1	Rated voltage		kilovolt	12
2	Rated Insulation Level	1-minute power-frequency withstand voltage (RMS)		42
		Lightning Impulse Withstand Voltage (Peak)		75
3	Rated short-circuit breaking current		kA	20	25	31.5	40
4	Rated current		A	630 1250		630 1250 1600 2000 2500 3150	630 1250 1600 2000 2500 3150 4000
5	Rated thermal stability current (RMS)		kA	20	25	31.5	40
6	Rated dynamic stability current (peak)			50	63	80	100
7	Rated Short-Circuit Making Current (Peak)			50	63	80	100
8	Rated short-circuit making current breaking operations		next	80	80	50	30
9	Power-frequency withstand voltage of the secondary circuit (1 min)		V	2000
10	Rated Operating Sequence		\	Break ~0.3s, Close-Open ~180s, Close-Open Open ~180 s ~ Close ~180 s ~ Close (40 kV)
10	Rated thermal stability time		S	4
11	Rated single/series-connected capacitor bank breaking current		A	630/400		800/400
12	Mechanical life		next	20000