ZN6(VS1) High Voltage Side Mounted Vacuum Circuit Breaker Lateral Fixed Vacuum Circuit Breaker 12KV 1250A

The ZN6(VS1) High Voltage Side Mounted Vacuum Circuit Breaker Lateral Fixed Vacuum Circuit Breaker 12KV 1250A provides reliable medium-voltage network protection. Featuring side-mounted installation, lateral fixed design, and vacuum interruption, it ensures safe load switching, minimal maintenance, and operational continuity, making it ideal for industrial facilities, substations, and indoor high-voltage switchgear applications.

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Summary

It is an indoor switchgear with three-phase AC 50Hz rated voltage of 12KV power system. It is used as protection and control unit for power equipment and industrial and mining enterprises. Applicable to places that require frequent operation at rated operating current, or multiple times to break short-circuit current.

The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, and can be used as a fixed installation unit, or can be equipped with a special propulsion mechanism to form a hand truck unit.

Features:

small size, light weight, suitable for frequent operation

Main structure:

vacuum interrupter, electromagnetic or spring operating mechanism, bracket and other components.

Main Product Technical

NO	Item	Units	Technical parameters
1	Rated voltage	KV	12
2	Rated short-duration power frequency withstand voltage		42/48(Interphase, ground/fracture)
3	Rated lightning impulse withstand voltage		42/48(Interphase, ground/fracture)
4	Rated frequency	Hz	50
5	Rated current	A	630 1250	630 1250 16002000 2500 3150	630 1250 16002000 2500 3150
6	Rated short-circuit breaking current	KA	20/25	31.5	40
7	Rated short-time withstand voltage	KA	20/25	31.5	40
8	Rated short circuit duration	S	4
9	Rated peak withstand current	KA	50/63	80	100
10	Rated short circuit closing current	KA	50/63	80	100
11	Secondary circuit power frequency withstand voltage (1min)		2000
12	Rated single / back to back capacitor group breaking current	A	630/400(40kA:800/400)
13	Rated capacitor bank closing current		12.5 (frequency is not greater than)
14	Mechanical life	KA	20000
15	Rated current breaking times (electrical life)	KA	20000
16	Rated short circuit current breaking times	times	50(40KA≤30)
17	Dynamic and static contacts allow wear cumulative thickness	mm	3
18	Energy storage time	s	≤10
19	Contact opening distance	mm	11±1
20	Overtravel	mm	3.5±0.5
21	Contact closing bounce time	ms	≤2(40KA≤3)
22	Three-phase split/closed period	ms	≤2
23	Average opening speed (contacts are separated by -8mm)	m/s	1.2±0.2
24	Main conductive loop resistance	m/s	0.6±0.2
25	Main conductive loop resistance	μΩ	≤50(630A)≤45(1250A)≤40 (1600,2000A)≤35 (2500A or more)
26	Rated operation sequence		0-0.3s-Co-180s-Co