Description
The VZF(R) 12KV vacuum load break switch-fuse combination is a12kV vacuum circuit breakerstyle protection unit that integrates a vacuum load break switch and current-limiting fuse in one compact module for indoor air-insulated switchgear (AIS). It is designed for three-phase AC 12kV, 50/60Hz medium-voltage systems, providing switching of normal load currents and fast, reliable short-circuit protection through the coordinated action of the vacuum switch and fuse.
As a China manufacturer, factory and exporter, we supply the VZF(R)-12 12kV vacuum circuit breaker switch-fuse combination to industrial users, commercial users, electrical contractors, panel builders and distributors who need safe and space-saving MV protection solutions. The VZF(R) 12KV can be configured as a withdrawable handcart unit or fixed-type device, making it ideal for integration into 1000 mm wide metal-clad switchgear for new projects or switchgear upgrades.
Key Features
- Rated voltage: 12kV, rated current: 630A
- Breaking capacity: 25kA (short circuit)
- Withdrawable handcart design, easy to install and maintain
- Vacuum interrupter with triple-sealed insulation
- Epoxy “T” pole cast with APG technology
- Fuse-blown trip function, ensuring double protection
- Full mechanical interlock and visible disconnection
- Modular terminal layout for easy wiring replacement
Key features and benefits
-
Compact, centrally installed vacuum load switch with fuse chamber, reducing panel depth and optimizing space inside indoor switchgear rooms
-
Clear functional division: vacuum part handles load switching and frequent operations, while high-rupturing capacity fuses clear short-circuit faults up to 50kA, improving system safety
-
High reliability and long service life with sealed vacuum interrupter design, low maintenance requirements and stable performance under frequent operation
-
Suitable for OEM, ODM, private label and white label projects, with customizable ratings, interlocks and interfaces for different switchgear manufacturers and distributors worldwide
Typical applications:12kV indoor AIS switchgear in industrial plants, commercial building substations, utility distribution stations, compact MV rooms, and packaged switchgear that require a combined 12kV vacuum circuit breaker–type switch-fuse protection unit.
Mechanical Characteristic Parameters
| No. | Item | Unit | Parameter |
| 1 | Contact gap | mm | 9±1 |
| 2 | Contact pressure spring travel | mm | 4±1 |
| 3 | Phase center distance | mm | 210/275 |
| 4 | Opening/closing time difference | ms | ≤2 |
| 5 | Contact closing spring time | ms | ≤3 |
| 6 | Average closing speed | m/s | 0.4~0.8 |
| 7 | Average opening speed | m/s | 1.0~1.4 |
| 8 | Closing time (rated voltage) | ms | ≤60 |
| 9 | Opening time (rated voltage) | ms | ≤30 |
| 10 | Main circuit resistance | mΩ | ≤250 |
| 11 | Allowable wear thickness of contacts | mm | 3 |
Technical Parameters
| No. | Name | Unit | VZF-12/T630-20 Vacuum Load Switch | VZFR-12/T125-50 Vacuum Load Switch – Fuse Combination |
| 1 | Rated voltage | kV | 12 | 12 |
| 2 | Power frequency withstand voltage (phase/earth) | kV | 42 | 42 |
| 3 | Lightning impulse withstand voltage (phase/earth) | kV | 75 | 75 |
| 4 | Rated current | A | 630 | 125 (Fuse) |
| 5 | Rated short-circuit breaking current | kA | – | 50 (Fuse) |
| 6 | Rated short-time withstand current | kA | 20 | – |
FAQ
Are you a VZF(R) 12kV vacuum circuit breaker manufacturer or trading company?
How does the VZF(R) 12kV vacuum circuit breaker switch-fuse combination work in the system?
Do you support OEM, ODM and customized branding for this 12kV vacuum circuit breaker unit?
What is the typical MOQ, lead time and price for bulk orders?
In which projects is the VZF(R) 12kV vacuum circuit breaker switch-fuse combination most commonly used?
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.