ZW43-12 Series Outdoor High Voltage Vacuum Circuit Breaker

Our ZW43-12 outdoor vacuum circuit breakers are compact versions of the ZW32 series, delivering reliable switching for 12kV urban and rural distribution systems with a space-saving design.

• Rated at 12kV, 630A, with short-circuit breaking up to 20kA and making current up to 50kA.

• Compact design with DC resistance per phase ≤80μΩ; contact wear allowance of 3mm for long service life.

• Mechanical life of 10,000 operations with 30 rated short-circuit breaking operations.

• Fast operation with opening time of 15–50ms, closing time of 25–80ms, and bounce time ≤2ms.

• Energy storage time ≤8s with charging motor power of 70W; compatible with DC/AC 220V control voltage.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

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Product Overview

The ZW43-12 outdoor high voltage vacuum circuit breaker is a compact version of the ZW32 circuit breaker. It is a three-phase AC 50 Hz, rated voltage 12 kV outdoor high voltage switchgear, suitable for making and breaking load currents, overload currents, and short-circuit currents in urban or rural distribution systems.

Technical Specifications

S.Q.	Item		Unit	ZW43-12/630-16
1	Rated Voltage		kv	12
2	Rated Current		A	630
3	Rated Short-Circuit Breaking Current		kA	16	20
4	Rated Short-Circuit Making Current (Peak)			40	50
5	Rated Peak Withstand Current			40	50
6	Rated Short-Time Withstand Current			16	20
7	Rated Short-Circuit Duration		S	4
8	Rated Insulation Level Lightning Impulse Withstand Voltage (Peak)		kV	- Lightning Impulse Withstand Voltage (Peak) Phase-to-Phase, Phase-to-Earth: 75 kV; Across Isolating Gap: 85 kV
9	Rated Insulation Level 1min Power Frequency Withstand Voltage			- Power Frequency Withstand Voltage (1 min) Phase-to-Phase, Phase-to-Earth: 42 kV; Across Isolating Gap: 48 kV
10	Rated Operating Sequence		times	- Rated Operating Sequence: O - 0.3 s - CO - 180 s - CO (Electric Operating Mechanism)
11	Rated Number of Short-Circuit Breaking Operations			30
12	Mechanical Life			10000
13	Rated Control Voltage (Opening/Closing Coil)		V	DC220,110,AC220
14	Permissible Cumulative Wear Thickness of Contacts		mm	3
15	Rated Current of Overcurrent Release		A	5
16	Current Transformer Ratio			200/5400/5630/5
17	Contact Gap		mm	9±1
18	Contact Over-travel			2(-0.5/+1)
19	Average Opening Speed		m/s	1.2±0.2
20	Average Closing Speed			0.6±0.2
21	Opening Time		ms	15～50
22	Closing Time			25~80
23	Closing Bounce Time			≤2
24	Three-Phase Opening/Closing Synchronism			≤2
25	DC Resistance per Phase		μΩ	≤80
26	Charging Motor	Rated Voltage	V	DC/AC 220
27		Rated Power	W	70
28		Energy Storage Time	S	≤8
29	Weight		Kg	90

Model and Designation

Z W 43 - 12 / 630 - 20

Z: Vacuum Circuit Breaker

W: Outdoor

43: Design Serial Number

12: Rated Voltage (kV)

630: Rated Current (A)

20: Rated Short-Circuit Breaking Current (kA)

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