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The ZW32 series outdoor pole-mounted vacuum circuit breaker is a three-phase AC outdoor primary switching device rated for 12kV (available in 24kV and 40.5kV variants upon request), 50Hz/60Hz power systems. Designed with advanced vacuum arc interruption and solid insulation technology, this circuit breaker is engineered to safely break and close load currents, overload currents, and short-circuit currents in power distribution networks.
With a compact three-phase pillar structure, the ZW32 offers reliable performance in harsh outdoor environments, making it an ideal solution for substations, industrial and mining distribution systems, rural electrification projects, and frequent-operation scenarios.
Equipped with high-performance vacuum interrupters (ceramic shell with copper-chromium contacts), the ZW32 delivers stable and reliable breaking performance with minimal contact wear. The vacuum arc extinguishing chamber is sealed within each phase's insulated sleeve, eliminating the risk of combustion or explosion.
The independent phase pillar design prevents three-phase short circuits when a single-phase fault occurs, significantly enhancing system reliability and safety.
Each phase pillar utilizes APG (Automatic Pressure Gelation) integral casting technology with silicone rubber or epoxy resin insulation materials. This provides:
Excellent hydrophobicity and pollution resistance
Enhanced resistance to ozone, UV radiation, and aging
Anti-condensation properties suitable for humid and harsh climates
Available with two types of operating mechanisms:
Spring operating mechanism – low energy consumption, high reliability, direct-drive transmission
Permanent magnet mechanism – minimal action time dispersion, ideal for frequent operations, truly maintenance-free
Both support manual and electric operation modes.
The circuit breaker housing is constructed from high-quality stainless steel with a fully sealed design. The enclosure achieves IP67 protection rating, providing excellent resistance against moisture, rust, condensation, and dust ingress. It is oil-free and environmentally friendly.
An integrated isolation switch can be added to provide a visible isolation breakpoint with reliable mechanical interlocking, preventing misoperation.
When paired with an intelligent controller (FTU), the ZW32 supports distribution automation functions including:
Remote control (remote open/close)
Remote measurement (real-time voltage/current monitoring)
Remote signaling (status indication)
Remote adjustment (parameter configuration)
The breaker can automatically detect, isolate, and report faults, and restore power to non-faulted sections.
Parameter | Unit | Value |
|---|---|---|
Rated Voltage | kV | 12 (24/40.5 available) |
Rated Current | A | 630, 1250 |
Rated Frequency | Hz | 50 / 60 |
Rated Short-circuit Breaking Current | kA | 20, 25 |
Rated Peak Withstand Current | kA | 50, 63 |
Rated Short-time Withstand Current (4s) | kA | 20, 25 |
Rated Short-circuit Making Current (Peak) | kA | 50, 63 |
Rated Power-frequency Withstand Voltage (1min) – Phase/earth | kV | 42 |
Rated Power-frequency Withstand Voltage (1min) – Across break | kV | 48 |
Rated Lightning Impulse Withstand Voltage (Peak) – Phase/earth | kV | 75 |
Rated Lightning Impulse Withstand Voltage (Peak) – Across break | kV | 85 |
Mechanical Life | times | 10,000 |
Rated Short-circuit Breaking Operations | times | ≥30 |
Enclosure Protection Rating | – | IP67 |
Net Weight | kg | ~85–120 |
Parameter | Value |
|---|---|
Contact Gap | 9±1 mm |
Contact Overtravel | 2.5±0.5 mm |
Average Opening Speed | 1.25±0.2 m/s |
Average Closing Speed | 0.75±0.2 m/s |
Contact Bounce Time | ≤2 ms |
Three-phase Opening Synchronism | ≤2 ms |
Closing Time | ≤60 ms |
Opening Time | ≤45 ms |
Conductive Loop Resistance (per phase) | ≤70 μΩ |
Motor Rated Power | 40 W |
Component | Rated Voltage Options | Operating Range |
|---|---|---|
Motor | DC24/110/220V, AC220V | 85%–110% rated voltage |
Opening/Closing Coil | DC24/110/220V, AC220V | Opening: 65%–120% / Closing: 85%–110% |
The ZW32 series is widely deployed in:
10–12kV overhead distribution networks
Substations – protection and control of feeder lines
Industrial facilities – power distribution and equipment protection
Mining operations – reliable switching in demanding environments
Rural electrification – frequent operation scenarios and remote locations
Urban power grids – as line sectionalizers and boundary switches
When configured with an intelligent controller, the ZW32 serves as an automated recloser for fault detection, isolation, and service restoration in distribution automation systems.
Feature | Benefit |
|---|---|
Vacuum arc interruption | Safe, reliable, no fire/explosion risk |
Maintenance-free design | Reduced operational costs over lifetime |
Compact & lightweight | Easy pole-mounting, minimal footprint |
All-weather durability | Operates reliably in wet, cold, heat, and high-pollution environments |
Smart controller compatible | Enables distribution automation and remote monitoring |
Flexible mechanism options | Spring or permanent magnet to suit different operational needs |
Optional isolation switch | Visible break point for enhanced safety |
When placing an order, please specify:
Model: ZW32-12 / ZW32-24 / ZW32-40.5
Rated Current: 630A / 1250A
Breaking Capacity: 20kA / 25kA
Operating Mechanism: Spring type / Permanent magnet type
Control Voltage: DC24V / DC110V / DC220V / AC220V
Isolation Switch: With / Without
Controller: Standard / Intelligent FTU (optional)
Mounting Accessories: As per project requirements
The ZW32 series complies with:
GB1984 – High-voltage AC circuit breakers (Chinese national standard)
JB3855 – 3.6–40.5kV outdoor AC high-voltage vacuum circuit breakers
Relevant IEC standards
