ZW32-12 12kV Outdoor Vacuum Circuit Breaker

1. Product Overview

The ZW32-12 Series Outdoor High Voltage Vacuum Circuit Breaker is a three-phase AC 50Hz pole-mounted device designed for 10kV urban and rural power distribution systems. It is primarily used for making and breaking load currents, overload currents, and short-circuit currents, ensuring safe and reliable operation of medium-voltage networks.

With its compact structure, lightweight design, and maintenance-free vacuum interrupter, the ZW32-12 provides long service life and consistent performance under harsh conditions. It can also function as an automatic recloser or sectionalizer when combined with an intelligent controller, supporting distribution automation in modern smart grids.

2. Model Designation

ZW32-12(G)/T630-□

Symbol	Description
ZW	Vacuum circuit breaker
32	Outdoor design number
12	Rated voltage (12kV)
G	With an isolating switch (optional)
/T	Spring operating mechanism
630	Rated current (A)
□	Rated short-circuit breaking current

3. Operating Conditions

Ambient temperature: -40°C ~ +40°C
Altitude: ≤ 2000 m
Wind pressure: ≤ 700 Pa (equivalent to 34 m/s)
Seismic tolerance: ≤ 8 degrees
Vibration: No frequent or severe vibrations
Environment: Suitable for outdoor installations without flammable, explosive, or corrosive gases

4. Structural Features

• Advanced three-phase pillar structure:
Ensures stable breaking performance with no risk of combustion or explosion, while maintaining long service life and low maintenance.

• Fully sealed design:
Provides excellent moisture and condensation resistance, making it ideal for cold, humid, or coastal environments.

• High-grade insulation materials:
Each phase pillar and current transformer is made of imported outdoor epoxy resin or epoxy encapsulated with silicone rubber, offering superior UV resistance, aging resistance, and temperature durability.

• Compact spring operating mechanism:
Features a miniaturized spring actuator with low energy consumption and high reliability. The drive mechanism uses a direct-action transmission with fewer components, ensuring smooth operation.

• Corrosion-resistant sealed mechanism box:
Protects the actuator from rust and environmental degradation, significantly improving long-term reliability.

• Multi-operation modes:
Supports manual, electric, and remote operation, easily integrating with intelligent controllers for SCADA or automation systems.

• Protection and metering compatibility:
Can be equipped with two or three current transformers for overcurrent and short-circuit protection, and additional CTs for metering purposes.

• Optional isolating switch and surge arrester:
The isolator provides a visible break gap for maintenance safety and a mechanical interlock with the main circuit breaker, ensuring operational interdependence. Surge arresters can be mounted for integrated protection.

ZW32-12 12kV Outdoor Vacuum Circuit Breaker

5. Main Technical Parameters

Item	Unit	Data
Rated voltage	kV	12
Rated current	A	630
Power frequency withstand voltage (1min)	kV	42
Lightning impulse withstand voltage (peak)	kV	75
Rated short-circuit breaking current	kA	12.5 / 16 / 20
Rated short-circuit making current (peak)	kA	31.5 / 40 / 50
Peak withstand current	kA	31.5 / 40 / 50
4s short-time withstand current	kA	12.5 / 16 / 20
Operating sequence	—	O – 0.3s – CO – 180s – CO
Short-circuit breaking life	operations	30
Mechanical life	operations	10,000
Motor voltage for energy storage	V	DC/AC 220, 110, or DC 24
Opening coil voltage	V	DC/AC 220, 110, or DC 24
Closing coil voltage	V	DC/AC 220, 110, or DC 24
Overcurrent release current	A	5
Contact wear allowance	mm	3
Weight	kg	103 (standard) / 138 (with isolator)
Interphase distance	mm	340 ± 3

6. Compliance and Certifications

The ZW32-12 series complies with major international standards, ensuring high safety, interoperability, and quality:

Standard	Description
IEC 62271-100	High-voltage alternating-current circuit breakers
IEC 62271-200	AC metal-enclosed switchgear and controlgear
GB 1984-2014	High-voltage AC circuit breakers
GB/T 11022-2020	Common technical requirements for high-voltage switchgear

7. Key Advantages

• High breaking capacity and fast response
Ensures quick isolation of overloads and short-circuits, minimizing system downtime.

• Maintenance-free vacuum interrupter
Operates up to 10,000 cycles without internal maintenance or gas refilling.

• Excellent insulation and weather resistance
Ideal for extreme climates, including coastal and alpine regions.

• Compact, lightweight, and easy to install
Pole-mounted design simplifies field setup and minimizes installation space.

• Smart grid integration
Supports remote operation, auto reclosing, and data monitoring when paired with intelligent controllers.

8. Typical Applications

10kV urban and rural distribution networks
Feeder automation and sectionalizing points
Renewable energy substations (solar, wind, hydro)
Industrial and commercial power systems
Outdoor pole-mounted switchgear modernization

9. Customer Feedback

“We’ve deployed over 120 units of ZW32-12 across our rural substations — zero mechanical failure in four years.”
— James Miller, Maintenance Engineer, Hydro One (Canada)

“Compact design, easy integration with SCADA, and highly reliable during short-circuit tests.”
— Peter Howard, Grid Automation Specialist, E.ON UK

“Perfect for coastal zones; we’ve seen excellent performance even in heavy salt-fog conditions.”
— Linda Torres, Project Engineer, Iberdrola (Spain)

“Its visible isolation switch design improves field safety during maintenance operations.”
— Alex Grant, Distribution Supervisor, AGL Energy (Australia)

10. FAQ

• What voltage level is supported by ZW32-12?
The breaker is rated for 12kV three-phase AC distribution systems.

• Can it work with intelligent recloser controllers?
Yes. It can be paired with Weishoelec or third-party controllers for automation and remote monitoring.

• Is the switch SF₆-free?
Yes, it uses vacuum arc extinction and solid insulation, making it environmentally safe.

• What type of maintenance does it require?
Only periodic external inspection; the internal vacuum chamber is completely sealed.

• Can it operate in freezing or humid regions?
Absolutely. The sealed epoxy resin insulation and moisture-proof design make it ideal for harsh climates.