40.5kV Wind and Solar Vacuum Load Switch-Fuse Combination Unit from Dongfa Intelligent is designed for medium-voltage switchgear used in wind power, solar power, energy storage, and other new energy projects. The unit combines a load break switch, fuse protection, and vacuum circuit breaker functions, with a rated voltage of 40.5kV and load break switch rated current of 630-1250A. It is suitable for incoming and outgoing circuits and other medium-voltage applications in new energy step-up stations.
The 40.5kV Wind and Solar Vacuum Load Switch-Fuse Combination Unit integrates a load break switch, fuse protection, and vacuum circuit breaker into one equipment configuration. The load break switch handles normal load operation, the fuse provides short-circuit protection, and the vacuum circuit breaker performs fault current interruption.
The vacuum load break switch interruptor has a mechanical life of 5,000 operations, while the vacuum circuit breaker interruptor has a mechanical life of 10,000 operations. These parameters support switching requirements in wind and solar power systems.
The combination apparatus has an expected short-circuit breaking current of 31.5kA and an expected short-circuit making current of up to 80kA. The rated transfer current is 3150A, while fuse striker output energy is ≤ 4.
The spring operating mechanism supports AC/DC 220V and 110V. The appropriate configuration can be selected according to the control power supply of the new energy station.
| Parameter | Specification |
| Product Type | Wind and Solar Vacuum Load Break Switch-Fuse Combination |
| Rated Voltage | 40.5kV |
| Rated Frequency | 50Hz |
| Power-Frequency Withstand Voltage (Phase/Earth / Isolation Gap) | 95kV / 118kV |
| Lightning Impulse Withstand Voltage (Phase/Earth / Isolation Gap) | 185kV / 215kV |
| Control Circuit Power-Frequency Withstand Voltage | 2kV / 1min |
| Parameter | Specification |
| Rated Current | 630–1250A |
| Rated Active Load Breaking Current | 630–1250A |
| Rated Loop Breaking Current | 630–1250A |
| Rated Thermal Stability Current | 20–25kA / 4s |
| Rated Dynamic Stability Current | 50–63kA |
| Rated Short-Circuit Making Current | 50–63kA |
| Parameter | Specification |
| Rated Current | 125A |
| Expected Short-Circuit Breaking Current | 31.5kA |
| Expected Short-Circuit Making Current | 80kA |
| Rated Transfer Current | 3150A |
| Fuse Striker Output Energy | ≤ 4 |
| Parameter | Specification |
| Rated Current | 630-1250A |
| Rated Short-Circuit Breaking Current | 20-31.5kA |
| Rated Short-Time Withstand Current / Time | 20-31.5kA / 4s |
| Rated Peak Withstand Current | 50-80kA |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Component | Mechanical Life |
| Vacuum Load Break Switch Interrupter | 5,000 operations |
| Circuit Breaker Interrupter | 10,000 operations |
| Disconnector | 3,000 operations |
| Earthing Switch | 3,000 operations |
| Spring Operating Mechanism Voltage | AC/DC 220V, 110V |
| Parameter | Specification |
| Contact Gap | 18±2mm |
| Over-Travel | 6±2mm |
| Closing Time | 30-70ms |
| Contact Closing Bounce Time | ≤5ms |
| Contact Closing/Opening Asynchronous | ≤2ms |
| Average Closing Speed, Last 6mm | 0.6-1.3m/s |
| Opening Time | 20-50ms |
| Average Opening Speed, First 12mm | 1.0-1.8m/s |
The 40.5kV Wind and Solar Vacuum Load Switch-Fuse Combination Unit can be used on the medium-voltage side of wind power step-up stations for collector line incoming and outgoing circuits.
For photovoltaic projects, the equipment can be applied to medium-voltage switching sections associated with inverter systems and step-up stations.
The product can be configured for medium-voltage grid-connected switching in energy storage systems. Rated current, short-circuit requirements, and control voltage should be confirmed according to the project design.
The equipment is suitable for medium-voltage connection points in distributed solar and wind power projects, including commercial rooftop solar applications.
For a new project, the following information should be confirmed before selection:
For replacement projects, please also provide the original equipment model, nameplate information, mounting drawings, and available switchgear documentation. Dongfa Intelligent can review the electrical specifications and installation interface based on the supplied information.
Each unit undergoes relevant inspection and testing before shipment, including:
The products are manufactured according to applicable GB standards and IEC 62271 requirements. Core products are supported by type test reports.
The company has more than 2,000m² of production space and focuses on high-voltage electrical equipment manufacturing.
Dongfa Intelligent products have been exported to Southeast Asia and parts of Europe for applications in power systems, new energy projects, and industrial power distribution.
The load break switch and vacuum circuit breaker are available with rated currents from 630A to 1250A. The combination apparatus has a rated current of 125A.
The combination apparatus has an expected short-circuit breaking current of 31.5kA. The vacuum circuit breaker has a rated short-circuit breaking current of 20-31.5kA.
The spring operating mechanism supports AC/DC 220V and 110V.
Please provide the original equipment model, nameplate, mounting dimensions, switchgear information, rated current, short-circuit requirements, operating voltage, and quantity.
Standard products normally require 7-15 working days. Custom products normally require 15-30 working days, depending on the confirmed configuration.
Standard products support orders from 1 unit. The final configuration and lead time should be confirmed according to the order requirements.
For selection of the 40.5kV Wind and Solar Vacuum Load Switch-Fuse Combination Unit, please provide the rated current, short-circuit breaking requirement, operating mechanism voltage, switchgear information, and required quantity.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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