The ZW32-40.5 series outdoor high-voltage vacuum circuit breaker is a pole-mounted, three-phase pillar-type 40.5kV vacuum circuit breaker designed for AC 50Hz power systems up to 35kV. As a leading China-based manufacturer, factory and exporter, we supply the ZW32-40.5 to industrial users, commercial operators, electrical contractors and global distributors for the making, breaking and protection of load, overload and short-circuit currents in overhead distribution networks, substations, power plants and mining enterprises.
The unit integrates a vacuum interrupter, embedded solid-insulated pole, spring or permanent-magnet operating mechanism and built-in current transformers (100:5 to 1600:5) inside a fully sealed, maintenance-free enclosure. It delivers stable breaking performance, superior moisture- and condensation-resistance, and long service life in harsh outdoor environments (-35°C to +45°C, altitude up to 2000–3000 m, pollution level IV).
Key features
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Maintenance-free, compact and lightweight structure with high sealing performance
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Supports automatic reclosing, sectionalizing and distribution automation via intelligent controllers
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Optional silicone-rubber insulating sheath, lightning arrester and isolating switch (combined circuit breaker)
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Compliant with IEC 62271-100, GB 1984 and JB/T 3855 standards
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Available for OEM, ODM, white-label and private-label bulk wholesale, with flexible customization for global buyers
Typical applications: 35kV rural power grids, urban overhead distribution lines, wind and solar farms, industrial & mining plants, railway power supply and utility substations.
Main technical parameters of circuit breaker
| S/N | Item | Unit | Data |
| 1 | Rated voltage | kV | 40.5 |
| 2 | Rated current | A | 630/1250/1600 |
| 3 | Rated frequency | Hz | 50/60 |
| 4 | Power frequency withstand voltage 1min (wet) (dry) | kV | 80/95 |
| 5 | Lightning impulse withstand current (peak value) | kV | 185 |
| 6 | Rated short circuit breaking current | kA | 25 |
| 7 | Rated short circuit making current (peak value) | kA | 80 |
| 8 | Rated peak withstand current | kA | 80 |
| 9 | 4S short-term withstand current | 31.5 | |
| 10 | Rated operating cycle | o-0.1s-co-3s-c
o-6s-co-60s- resume |
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| 11 | Rated short circuit current breaking times | times | 30 |
| 12 | Mechanical life | times | 20000 |
| 13 | Intelligent mechanism control voltage | V | DC220 |
| 14 | Secondary circuit 1min power frequency withstand voltage | KV | 2 |
The ZW32 40.5kV Vacuum Circuit Breaker can be equipped with reclosing controller to identify the current characteristics and achieve multiple automatic reclosing, self-provided PT as a power source to become an intelligent circuit breaker with voltage and current signal output and can be controlled; by the electronic PT to provide power and can complete the overcurrent delay, inrush current delay, short-circuit quick-break three-stage composite protection.
ZW32 40.5kV Vacuum Circuit Breaker of products overall for the pillar type, three-phase common mounted on a mechanism box, the dynamic end of the interrupter room through the inflection arm, insulated tie rods for the output shaft of the mechanism connected. The mechanism and the connecting rod connected with the circuit breaker are in a waterproof box. The transmission mechanism of the circuit breaker is composed of a connecting rod and a crutch arm, and the dynamic end of the interrupter chamber is connected to the output shaft of the operating mechanism through a crutch arm, an insulated tie rod, a connecting rod and an operating mechanism. The rotation of the output shaft is driven to realise the dynamic contact of the arc extinguishing chamber to carry out the splitting and closing action.
ZW32 40.5kV series products are equipped with current transformer, each phase can take four windings, two of which are used for measurement, two for protection. According to customer’s need, 100:5, 200:5, 400:5, 800:5, 1000:5, 1600:5 current transformer can be installed.
Disconnecting switches can be added to the side of the circuit breaker to form an outdoor high-voltage vacuum circuit breaker and an outdoor high-voltage disconnecting switch combination appliance, which increases the visible disconnecting breaks and has reliable interlocking operation.