Primary and Secondary Integrated Outdoor Circuit Breaker
Product Overview
The ZW32-12 primary–secondary integrated outdoor circuit breaker (hereinafter referred to as the “circuit breaker”) is an outdoor switchgear with a maximum rated voltage of 12 kV and designed for three-phase AC operation at 50 Hz. It is primarily used for making and breaking load currents, overload currents, and short-circuit currents in power systems. The device is suitable for protection and control applications in substation and industrial/mining enterprise distribution systems, as well as in rural power grids where frequent switching operations are required. It can also serve as a sectionalizing switch in the power grid, and when equipped with a controller, it can support distribution network automation.
Terms of Use
● Altitude not exceeding 2,000 meters; Pollution degree: Level IV.
● Ambient air temperature: -45°C to +40°C; daily temperature range: 25°C.
● Wind speed shall not exceed 35 m/s; seismic intensity shall not exceed Grade 8.
● Areas free from flammable, explosive, and chemically corrosive hazards.
Implementation Standard
GB 11022-1999 “Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment”
GB 311.1-1997 “Insulation Coordination for High-Voltage Transmission and Transformation Equipment”
GB 3309-1989 “Mechanical Tests of High-Voltage Switchgear at Ambient Temperature”
GB 1208-2006 “Current Transformers”
GB/T 1984-2024 “High-Voltage AC Circuit Breakers”
GB/T 11022 “Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment”
GB/T 20840.7-8 “Electronic Voltage/Current Transformers”
GB/T 7261-2000 “Basic Test Methods for Relays and Devices”
GB/T 4208 “Ingress Protection Rating (IP Code)”
DL/T 593 “Common Technical Requirements for High-Voltage Switchgear”
DL/T 721 “Remote Terminal Units for Distribution Automation”
DL/T 844-2003 “General Technical Specifications for 12 kV Maintenance-Reduced Outdoor Distribution Switchgear”
DL403-2000 “Technical Specifications for Ordering 12–40.5 kV High-Voltage Vacuum Circuit Breakers”
Main Features
● The circuit breaker adopts a three-phase pillar-type structure, featuring stable and reliable breaking performance, no risk of combustion or explosion, high safety, maintenance-free operation, compact size, light weight, and long service life.
● The circuit breaker features a fully enclosed structure with excellent sealing performance, offering moisture and condensation resistance, making it particularly suitable for operation in extremely cold or hot, humid environments.
● The three-phase support insulators and instrument transformers employ imported outdoor epoxy resin solid insulation, which offers excellent resistance to high and low temperatures, ultraviolet radiation, and aging. The integral support sleeve utilizes a composite insulation structure of silicone rubber and indoor epoxy resin, effectively addressing issues related to partial discharge, sealing performance, and bounce stability.
● An integrated external current and voltage transformer is employed, enabling simultaneous acquisition of phase current, zero-sequence current, and zero-sequence voltage signals, thereby laying the groundwork for future upgrades to automated functions.
● Equipped with a controller featuring three-stage transitional protection, inrush current suppression, event logging, and other functions to provide effective protection against line faults. Local switching operations—opening and closing—are supported, and a remote control is included that enables remote opening and closing of the circuit breaker within a 50-meter range, facilitating power shutdown and restoration in complex terrain.
● Equipped with an electromagnetic voltage transformer to provide a reliable operating power supply for the circuit breaker.
Technical Specifications
Circuit Breaker Performance Parameters
Project |
Unit |
Numerical value |
Rated voltage |
kilovolt |
12 |
Rated frequency |
Hertz |
50 |
Rated current |
A |
630 |
Rated short-circuit breaking current |
kA |
20 |
Rated Peak Withstand Current (Peak) |
kA |
50 |
Rated short-time withstand current/duration |
kA/S |
April 20 |
Rated short-circuit making current (peak) |
kA |
50 |
Mechanical life |
times |
10000 |
Rated short-circuit breaking current breaking operations |
times |
30 |
Power-frequency withstand voltage (1 min): (wet) (dry) phase-to-phase, phase-to-ground / break gap |
kilovolt |
34/42/48 |
Lightning impulse withstand voltage (peak) phase-to-phase, phase-to-ground/open circuit |
kilovolt |
75/85 |
1-minute power-frequency withstand voltage for the secondary circuit |
kilovolt |
2 |
Mechanical Characteristic Parameters
Project |
Unit |
Numerical value |
Contact opening distance |
mm |
9±1 |
Contact overtravel |
mm |
2–2.5 |
Trip speed |
m/s |
1.2±0.2 |
Closing speed |
m/s |
0.8±0.2 |
Contact closing bounce time |
milliseconds |
≤2 |
Phase-to-phase center distance |
mm |
340±1.5 |
Three-phase opening and closing non-synchronization |
milliseconds |
≤2 |
Resistance of each phase conductive circuit |
uO |
<80 |
External mounting dimensions
Contact Us
0411-83167110
No. 95, West Section of Shiji Road, Pulandian District, Dalian City, Liaoning Province
Leave a message to get a product quote.
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