FZRN21-12D Indoor High Voltage Vacuum Load Break Switch and Fuse Combination Apparatus (12kV)
The FZRN21-12D is a high-performance indoor vacuum load break switch combined with a fuse apparatus, specifically designed for 12kV, AC 50/60Hz power systems. As a cost-effective and reliable alternative to expensive Vacuum Circuit Breakers (VCB), it is an ideal solution for distributing power, controlling, and protecting electrical equipment in both urban and rural electricity networks.
Key Features:
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VCB Alternative: Provides a high-efficiency and economical alternative to standard vacuum circuit breakers in modern electrical networks.
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Advanced Protection: Engineered to break and make under both rated current and short-circuit current during circuit breakdowns.
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Transformer Specialist: Specifically applicable to the control and protection of transformers within distribution systems.
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Reliable Performance: Ensures stable power distribution and control for critical electric apparatus.
FZRN21-12D Indoor High Voltage Vacuum Load Break Switch and Fuse Combination Apparatus
1. Product Overview
The FZRN21-12D series is a high-performance indoor vacuum load break switch combined with a fuse apparatus, specifically designed for 12kV, AC 50/60Hz power systems. As a reliable and cost-effective alternative to expensive Vacuum Circuit Breakers (VCB), it is an ideal solution for distributing power, controlling, and protecting electrical equipment in both urban and rural electricity networks.
2. Key Features & Advantages
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VCB Alternative: Provides a high-efficiency and economical alternative to standard vacuum circuit breakers in modern electrical networks.
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Advanced Protection: Engineered to break and make under both rated current and short-circuit current during circuit breakdowns.
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Reliable Interlocking: Features a dependable interlock mechanism between the vacuum arc-extinguishing chamber, disconnect blade, and grounding blade.
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Automatic Tripping: When a fuse breaks down, the load-breaking switch automatically opens via the interlock mechanism.
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Flexible Installation: Can be mounted within switchgear or hung on a wall to protect transformers.
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Dual Operation Mode: Opening operations can be performed via dependent manual or dependent power (electric spring) mechanisms.
3. Technical Specifications
Load Break Switch (LBS) Parameters
| No. | Description | Unit | Data |
| 1 | Rated Voltage | kV | 12 |
| 2 | Rated Frequency | Hz | 50/60 |
| 3 | Rated Current | A | 630 |
| 4 | Rated Active Load Breaking Current | A | 630 |
| 5 | Rated Closed-loop Breaking Current | A | 630 |
| 6 | 4s Rated Short-time Withstand Current | kA | 31.5 |
| 7 | Rated Short-circuit Making Current | kA | 80 |
| 8 | Mechanical Life | Times | 10000 |
HRC Fuse Combination Parameters
| No. | Description | Unit | Data |
| 1 | Rated Maxim Current of Fuse | A | 125 |
| 2 | Transfer Current | A | 1550 |
| 3 | Opening Duration (Activated by Fuse) | ms | $40 \pm 5$ |
| 4 | Rated Short-circuit Breaking Current | kA | 31.5 |
4. Application Environments
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Target Systems: Suitable for AC 50/60Hz, 12kV three-phase power distribution systems.
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Key Uses: Power control and distribution for rural and urban networks, especially ideal for transformer protection.
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