Dongfa Intelligent supplies global power engineering companies with factory-direct Load Break Switches designed for medium voltage switchgear, transformer protection, and distribution applications.
A load break switch is mainly used for switching normal load current, while short-circuit protection is normally completed through high voltage fuses. This clear functional separation allows engineers to select a suitable switching solution according to system requirements.
Dongfa Intelligent provides 12kV and 40.5kV solutions including indoor types, fuse combination units, and pneumatic operating models for different power distribution scenarios.
Choosing between a load break switch and a circuit breaker depends on fault level, operation frequency, and protection requirements.
The performance of a fuse combination system depends on accurate coordination between the fuse and the switching mechanism. When a short-circuit fault occurs, the fuse operates first and the striker activates the opening action.
High current fault is detected by the fuse element.
The fuse melts and releases striker energy.
The mechanism receives the striker force and disconnects the circuit.
Dongfa completes fuse and switch coordination verification before shipment to ensure transfer current and striker energy match the required operating conditions.
Dongfa Intelligent offers different configurations according to installation environment, protection requirements, and operating conditions. Each series is designed for medium voltage switchgear applications with reliable switching performance.
Designed for indoor switchgear installation with a compact structure and stable mechanical operation. Suitable for distribution cabinets, ring main units, and medium voltage power networks.
Combines switching function with high voltage fuse protection. This configuration is commonly used for transformer protection and distribution systems requiring simple protection coordination.
Using pneumatic operating mechanisms, this solution is suitable for industrial environments where stable control power supply is limited.
Designed for medium voltage distribution applications requiring reliable switching and fuse protection. The pneumatic operating mechanism provides stable operation in industrial and remote environments.
| Parameter | 630A Configuration (FZN25) | 125A Configuration (FZRN25) |
|---|---|---|
| Rated Voltage | 12kV | 12kV |
| Rated Current | 630A | 125A |
| Active Load Breaking Current | 630A | 125A |
| Thermal Stability Current | 20kA / 4s | - |
| Short-Circuit Breaking Current | - | 31.5kA |
| Rated Transfer Current | - | 870A |
| Fuse Model | - | SDLAJ-12 / SFLAJ-12 |
| Striker Output Energy | - | 2-5J |
| Mechanical Life | 10000 Operations | 10000 Operations |
Flexible Configuration: Support different fuse combinations, operating mechanisms, and application requirements based on project specifications.
Fuse Coordination Testing: Each combination unit is checked before shipment to ensure proper matching between fuse action and switch operation.
Medium Voltage Experience: Dongfa focuses on high voltage electrical products with technical experience in switchgear components and protection solutions.
Flexible Ordering: Support small quantity requirements with standard production lead time of 7-15 working days.
A load break switch is mainly designed for switching normal load current, while a circuit breaker can interrupt short-circuit current. Load break switches usually work together with fuses for short-circuit protection, providing a simpler protection solution for suitable applications.
A load break switch-fuse combination unit is commonly selected for transformer protection and medium voltage distribution systems where simple protection coordination, reliable switching, and efficient operation are required.
Dongfa provides medium voltage switching solutions including 12kV and 40.5kV classes for different switchgear structures and power distribution requirements.
During a fault condition, the fuse operates first and releases striker energy. The striker then activates the opening mechanism to disconnect the circuit. Proper coordination ensures reliable operation without unnecessary mechanical stress.
Yes. Dongfa supports OEM and customized requirements including structural adaptation, fuse matching, operating mechanism selection, and technical confirmation according to customer applications.
Please provide voltage class, rated current, transformer capacity, short-circuit current level, operating method, and required quantity. Our technical team will provide suitable product advice and quotation support.
Please provide: Voltage Class + Rated Current + Transformer Capacity + Short-Circuit Current Level + Operating Method + Quantity .
Dongfa technical team will review your requirements and provide product selection advice and quotation within 24 hours.
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