Product Overview
The FZW28Z-12 (FFK) is a 12kV, 50Hz outdoor pole-mounted vacuum sectionalizing load break switch with both manual and electric operation. Its switch body adopts the imported Toshiba (Japan) VSP5-12 maintenance-free load-switch unit, using vacuum arc extinguishing with SF6 gas insulation. Combining fault detection, protection, control and communication, it is installed on 10kV distribution lines to automatically cancel single-phase-to-ground faults and to isolate phase-to-phase short-circuit faults. It is applied at the T-connection or at the user end of 10kV overhead feeders; a compact spring mechanism and aviation-plug secondary connections allow straightforward combination with an intelligent controller for automated distribution and remote operation.
Product Display
Model Designation
Model format: FZW28Z-12/630-20
- FZW: Outdoor Vacuum Load Switch
- 28: Design Sequence Number
- Z: Spring Operating Mechanism
- 12: Rated Voltage (kV)
- 630: Rated Current (A)
- 20: Rated Short-Circuit Breaking Current (kA)
Service Conditions
- Ambient Temperature: -40 degC to +40 degC
- Altitude:
- Relative Humidity: Daily average
- Wind Pressure:
- Neutral Earthing: Solidly earthed, earthed via arc-suppression coil, or earthed via low resistance
- Installation Environment: Outdoor, no explosive or severely corrosive gas, no frequent severe vibration
Construction
The FZW28Z-12 integrates a vacuum-interrupter load-switch unit (imported Toshiba VSP5-12) inside a sealed, SF6-insulated enclosure, giving maintenance-free operation with no gas leakage and full isolation from the outdoor environment.
A miniaturized spring operating mechanism with manual and electric options provides reliable 10,000-operation life, while aviation plugs bring the secondary control, sensing and communication circuits to an external intelligent controller; the unit is designed for quick pole mounting with standard brackets for repeated sectionalizing and fault-isolation duty.
Technical Data
| Item | Unit | Value |
|---|---|---|
| Rated voltage | kV | 12 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630 |
| Rated short-circuit breaking current | kA | 20 |
| Rated short-time withstand current (4 s) | kA | 12.5 / 16 / 20 |
| Rated short-circuit making current (peak) | kA | 31.5 / 40 / 50 |
| 1 min power-frequency withstand voltage (ph-ph / ph-earth / open contacts) | kV | Dry 42 / 48; Wet 34 |
| Lightning impulse withstand voltage (peak, ph-ph / ph-earth / open contacts) | kV | 75 / 85 |
| Mechanical life | times | 10000 |
| Net weight | kg | 210 |
Standards
The FZW28Z-12 is designed and type-tested to IEC 62271-103 and GB/T 16926 for high-voltage alternating-current load break switches, covering making and breaking capacity, insulation level and mechanical endurance.
Installation & Dimensions
Installation Diagram
The FZW28Z-12 is designed for standard pole-mounted installation using brackets, with the controller mounted separately on the pole. Adequate clearance must be maintained around the unit for safe operation and maintenance, and all primary and secondary connections must comply with local utility standards. The certified outline and mounting dimension drawing is supplied with each unit.
| Dimension | Value (mm) |
|---|---|
| Overall height | 808 |
| Overall width (across cable outlets) | 795 |
| Switch body width | 400 |
| Switch body height | 658 |
| Control device height | 340 |
| Control device diameter | 300 |