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
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Compact, centrally installed vacuum load switch with fuse chamber, reducing panel depth and optimizing space inside indoor switchgear rooms
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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
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High reliability and long service life with sealed vacuum interrupter design, low maintenance requirements and stable performance under frequent operation
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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 | – |