Description:
ZW28 vacuum circuit breaker is applied outdoors and is generally installed at the upper end of the transformer. It belongs to the pillar type and is commonly installed on outdoor utility poles. There are also floor standing installations with enclosures, also known as column switches. Because it can cut off the circuit, it is the boundary point between high and low voltage at the upper end of the transformer, also known as the boundary switch. It has overcurrent and phase loss zero sequence protection, and plays a role in switching circuits and protecting loads such as transformers.
Applications:
The ZW28 Outdoor Vacuum Circuit Breaker is widely applied in:
Overhead medium-voltage distribution lines
Pole-mounted distribution systems
Outdoor substations and feeder protection points
Industrial power distribution networks
Renewable energy grid connection systems
Its design supports continuous outdoor operation while maintaining consistent switching performance and system protection.
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When there is overcurrent or short circuit in the outgoing line of the circuit, the current transformer can detect the current signal, which is transmitted to the controller. The controller issues a command to trip the mechanism, which drives the dynamic and static contacts inside the vacuum tube to separate, thereby achieving disconnection and cutting off the circuit, playing a protective role.
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①We can customize and assist customers in selecting the appropriate transformer capacity based on the site, adjusting the flow rate and cut-off value |
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②We have rich production experience, professional engineers, and extensive on-site debugging and installation experience. We produce over 3000 units per year with reliable quality |
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③We have professional debugging equipment and inspection personnel |
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④Our vacuum tubes are large tubes with conductive parts made of copper |
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To ensure transportation safety, our electrical products are exported in reinforced wooden crates. The crates undergo heat treatment and bear the ISPM-15 mark, enabling swift customs clearance. The raised base design facilitates forklift operation, while internal shock-absorbing fastening ensures the products arrive intact. All exterior crates are clearly labeled and comply with international logistics standards.
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| Parameter Category | Specification | Remarks |
| Rated Voltage | 12 kV | Standard for distribution networks |
| Rated Current | 400A, 630A, 1250A | Custom ratings available |
| Rated Short-Circuit Breaking Current | 16 kA, 20 kA, 25 kA | |
| Rated Short-Time Withstand Current | 16 kA / 4s, 20 kA / 4s, 25 kA / 4s | |
| Rated Peak Withstand Current | 40 kA, 50 kA, 63 kA | |
| Rated Insulation Level | Power Frequency: 42 kV (1 min) / Lightning Impulse: 75 kV | |
| Mechanical Life | 10,000 operations | |
| Electrical Life | 10,000 operations (at rated current) | Full capacity breaking |
| Interrupter Medium | Vacuum | Sealed ceramic bottle |
| Operating Mechanism | Spring | Manual or motorized |
| Control Voltage | AC/DC 110V, 220V | Optional 24V, 48V |
| Protection Degree | IP67 | Suitable for harsh environments |
| Dimensions (H×W×D) | 880 × 560 × 680 mm | Compact design |
| Weight | Approx. 130 kg | Easy to install |
| Installation Method | Pole-Mounted | Outdoor use |
| Ambient Temperature | -40°C to +55°C | Wide operating range |
| Altitude | ≤ 4000 m | High-altitude version available |
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Wholesale ZW28 Outdoor Vacuum Circuit Breaker for Pole-Mounted Medium Voltage Distribution Company
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