Product Overview
The FZW28-12 series is an outdoor AC high-voltage vacuum load break switch designed for 12kV three-phase distribution systems. It integrates making/breaking load currents and making short-circuit currents, serving as a critical component for automated distribution networks.
Consisting of the vacuum load break switch and a smart controller (connected via sealed cables), it accurately detects milliampere-level zero-sequence and phase-to-phase currents. This makes it highly adaptable to various neutral grounding systems, ensuring reliable operation in substations and industrial parks.
Model and Designation
F Z W 28 12 / T □ □
F: Load Break Switch
Z: Vacuum
W: Outdoor
28: Design Serial Number
12: Rated Voltage (kV)
T: Spring Operating Mechanism
□: Rated Current (A)
□: Rated ShortTime Withstand Current (kA)
Technical Specifications
|
No. |
Item |
Parameter |
|
Rated Voltage |
kV |
12 |
|
Rated Frequency |
Hz |
50 |
|
Rated Current |
A |
630/1250 |
|
Rated Short-Circuit Breaking Current |
kA |
20/25/31.5 |
|
Rated Making Current (Peak) |
kA |
50 |
|
Rated Dynamic Withstand Current (Peak) |
kA |
50 |
|
4s Short-Time Withstand Current |
kA |
20 |
|
Rated Operating Sequence |
O-0.3s-CO-180s-CO |
|
|
Rated Charging Motor Voltage |
V |
AC220 |
|
Maximum/Minimum Charging Motor Voltage |
V |
AC242/187 |
|
Rated Closing Operating Voltage |
V |
AC220 |
|
Maximum/Minimum Closing Operating Voltage |
V |
AC264/143 |
|
Rated Opening Operating Voltage |
V |
AC220 |
|
Maximum/Minimum Opening Operating Voltage |
V |
AC264/143 |
|
Closing Asynchronism |
ms |
≤2 |
|
Opening Asynchronism |
ms |
≤2 |
|
SF6 Gas Rated Pressure (Gauge) |
Mpa |
0.01 |
|
Rated Number of Short-Circuit Breaking Operations |
times |
≥30 |
|
Mechanical Life |
times |
10000 |
Core Advantages
- Extreme Weather Ready: Built for harsh environments with an operating temperature range of -40°C to +40°C, altitude up to 2000m, and wind pressure up to 700 Pa. Suitable for outdoor installation in Class IV pollution areas.
- Smart Automation Integration: Equipped with an integrated controller that accurately detects milliampere-level zero-sequence currents. Adaptable to isolated neutral, arc suppression coil, and low-resistance grounding systems.
- High Breaking Capacity: Rated 12kV, 630A/1250A. Short-circuit breaking up to 31.5kA, making capacity up to 50kA (peak). Mechanical life of 10,000 operations with ≥30 short-circuit breaking operations.
- Reliable & Precise: Features SF6 gas insulation (0.01MPa, creepage ≥31mm/kV). Opening and closing asynchronism ≤2ms for precise operation, with an operating sequence of O-0.3s-CO-180s-CO.
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