ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker - featured

ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker

ZW32-12: 12kV Outdoor Pole-Mounted Vacuum Circuit Breaker

  • 12 kV 50 Hz pole-mounted VCB for overhead feeders
  • 630 A rating with 20 kA breaking and 50 kA peak duty
  • 42 kV power-frequency and 75 kV impulse withstand
  • Sealed post design for cold, humid, coastal sites
  • Manual, electric and remote control, recloser ready
  • G model adds interlocked isolator, visible break
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Product Overview

The ZW32-12(G) is a three-phase 12 kV 50 Hz outdoor pole-mounted vacuum circuit breaker for overhead feeder protection and distribution automation in urban and rural networks. It interrupts load, overload and short-circuit currents with a 630 A continuous rating, 20 kA breaking capacity and 50 kA peak withstand, while its fully sealed post structure keeps the unit reliable in cold, humid and coastal service environments.

Product Display

ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker - display

ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker - poster_display

Model Designation

ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker - model

Model format: ZW 32 − 12 G / 630 − 20

  • Z — Vacuum circuit breaker
  • W — Outdoor application
  • 32 — Design sequence
  • 12 — Rated voltage (kV)
  • G — With isolating switch (optional)
  • 630 — Rated current (A)
  • 20 — Rated short-circuit breaking current (kA)

Service Conditions

  • Voltage class: 12 kV, system frequency 50 Hz
  • Installation: outdoor, pole-mounted on overhead distribution networks
  • Altitude: not exceeding 1000 m above sea level
  • Ambient temperature: −25 °C to +40 °C
  • Environment: standard outdoor conditions; sealed design and outdoor-grade insulation suit cold, humid and coastal areas

Construction

The breaker uses a three-phase post structure with fully sealed construction for moisture-proof and anti-condensation performance in cold and humid climates. Posts and current transformers are moulded from outdoor-grade insulation — epoxy resin or silicone-rubber-wrapped epoxy resin — giving resistance to UV exposure, temperature extremes and ageing.

A miniaturised spring operating mechanism with few moving parts is housed in a sealed mechanism box to prevent rust and hold stable operation across manual, electric and remote modes, and it interfaces with smart controllers and recloser systems. Two- or three-phase protection CTs and optional metering CTs can be integrated; the G-model adds a three-phase isolating switch with visible disconnection, mechanical interlocks and provision for lightning arresters and post insulators.

Technical Data

Item Unit Value
Rated Voltage kV 12
Rated Current A 630
Rated Short-Circuit Breaking Current kA 20
Rated Short-Time Withstand Current (4 s) kA 20
Rated Peak Withstand Current kA 50
Power Frequency Withstand Voltage kV/min 42
Lightning Impulse Withstand Voltage (peak) kV 75
System Frequency Hz 50
Application — Outdoor, overhead distribution
Operation Modes — Manual, electric, remote
Selection note: ensure the rated short-circuit breaking current (20 kA) exceeds the prospective fault current at the intended installation point.

Standards

Manufactured and type-tested in accordance with IEC and GB standards for high-voltage AC circuit breakers, including IEC 62271-100 and GB 1984.

Technical note: type-test reports and certification documents are available on request.

Installation & Dimensions

Installation Diagram

The breaker mounts directly on standard φ190 concrete or steel poles. Correct clearance and alignment during installation preserve electrical safety and mechanical stability.

Dimension Value (mm)
Total Height 1890
Mounting Bracket Height 1350
Phase Spacing 300
Pole Diameter Compatibility φ190
Safety notice: verify pole compatibility and maintain minimum phase-to-phase and phase-to-ground clearances per local electrical codes during installation.

FAQs

The ZW32-12 provides a rated short-circuit breaking current of 20 kA with a matching 20 kA/4 s short-time withstand and 50 kA peak withstand. Confirm that this rating exceeds the prospective fault current at your installation point; our engineers can verify system fault levels on request.

Yes. The fully sealed construction and outdoor-grade epoxy or silicone-rubber insulation protect against moisture, condensation, UV and salt-laden air, so the unit suits cold, humid and coastal sites. Specify any project-specific IP or coating requirements at inquiry.

The breaker withstands 42 kV for one minute at power frequency and 75 kV peak under lightning impulse, matching standard 12 kV outdoor distribution insulation requirements. Type-test reports are available on request.

Every unit passes standard routine tests covering mechanical operation, secondary-wiring correctness and dielectric performance before dispatch. Customised test protocols or third-party inspection can be arranged; state your requirements during inquiry.

Base models follow standard production lead times. Customised CT ratios, controllers, communication options or accessory integrations extend the manufacturing schedule. Contact our sales team for a delivery timeline based on your configuration and order volume.

It is used on 12 kV 50 Hz overhead distribution networks as the protection and sectionalising device for rural and urban feeders, including automation and reclosing schemes. Verify local grid standards for compliance before specification.

Choose the G version when a visible disconnection point and mechanical interlock are required for maintenance safety on pole-mounted installations. It integrates a three-phase isolating switch and provision for lightning arresters and post insulators.

Inquiry for ZW32-12 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker:

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