Overview of ZW20A-12 Vacuum Circuit Breaker

The ZW20A-12/T□-□ series outdoor high-voltage vacuum circuit breaker is a cutting-edge device designed for 12kV, three-phase AC power systems operating at 50Hz. This breaker is ideal for managing and protecting load currents, overload currents, and short-circuit currents in distribution networks, substations, industrial plants, and rural power systems. It is particularly suited for frequent operation scenarios and automated grid networks.

As an improved version of the ZW20-12 breaker, the ZW20A-12 features advanced vacuum arc extinguishing technology and SF6 gas as the insulating medium. The breaker incorporates Japanese Toshiba VSP5 structural technology for gas sealing, insulation, and explosion-proof performance. Its enhanced sealing ensures zero SF6 gas leakage and reliable operation, unaffected by environmental conditions.

The compact spring-operated mechanism has been optimized for higher reliability and stability, utilizing a direct chain drive and multi-stage tripping system. This innovation significantly improves performance over traditional spring mechanisms. The main circuit employs an internal expansion and external contraction bracelet structure, reducing contact resistance and temperature rise.

Type Designation for ZW20-12 Vacuum Circuit Breaker

• ZW: Denotes the vacuum circuit breaker.
• 20: Design sequence number for the product series.
• 12: Rated voltage in kilovolts (kV).
• T: Indicates the spring-operated mechanism.
• □: Represents the rated current (A).
• □: Denotes the rated short-circuit breaking current (kA).

Key Functions of ZW20A-12 Vacuum Circuit Breaker

The ZW20A-12/T630-20 outdoor high-voltage AC vacuum circuit breaker is equipped with advanced functionalities to meet the demands of modern power systems. Its main features include instantaneous protection, overcurrent protection, three-time auto reclosing, event recording, inrush current protection, zero-sequence protection, real-time clock, post-reclosing acceleration, real-time status query, intelligent handheld control, local and remote configuration settings, proactive fault reporting, and GSM messaging functionality. These features ensure comprehensive protection and monitoring for efficient power distribution management.

Product Characteristics

This circuit breaker consists of the ZW20A-12 vacuum circuit breaker body, an RDCU-1A fault detection controller, and an external voltage transformer, interconnected through aviation connectors and outdoor sealed control cables. It offers reliable fault detection, protection control, and communication capabilities, enabling accurate identification and isolation of milliamp-level zero-sequence currents and interphase short-circuit faults. The vacuum arc-extinguishing mechanism ensures effective performance, while the use of SF6 gas insulation and advanced sealing technologies from Toshiba provides exceptional reliability and environmental resistance. The fully sealed structure eliminates SF6 gas leakage, ensuring robust operation in various environmental conditions, making it a superior outdoor circuit breaker solution.

Technical Parameters of ZW20A-12 Vacuum Circuit Breaker

The ZW20A-12 Vacuum Circuit Breaker is designed for 12kV, 50Hz three-phase AC systems, offering reliable short-circuit protection with advanced vacuum arc extinguishing and SF6 gas insulation. Customizable features include anti-corrosion materials, UV-resistant coatings, adjustable rated current (400A–800A), integrated lightning arresters, and flexible mounting options.

Item	Unit	Data
Rated Voltage	kV	12
Rated Frequency	Hz	50
Rated Current	A	630
Rated Short-Circuit Breaking Current	kA	20
Rated Making Current (Peak)	kA	50
Rated Dynamic Current (Peak)	kA	50
4s Rated Short-Time Withstand Current	kA	20
Rated Operating Sequence		Open–0.3s–Close Open–180s–Close Open
Rated Energy Storage Motor Voltage	V	AC220
Maximum/Minimum Energy Storage Motor Voltage	V	AC242/AC18
Rated Closing Voltage	V	AC220
Maximum/Minimum Closing Voltage	V	AC264/AC14
Rated Opening Voltage	V	AC220
Maximum/Minimum Opening Voltage	V	AC264/AC14
Closing Non-Synchronism	ms	≤2
Opening Non-Synchronism	ms	≤2
SF6 Gas Rated Pressure (Gauge Pressure)	MAS	0.01
Rated Short-Circuit Current Breaking Times	Times	30
Mechanical Life	Times	10000

Outline and Installation Dimensions

Ordering Guidelines

This comprehensive description of the ZW20A-12 Vacuum Circuit Breaker outlines its key features, technical specifications, and ideal applications. For accurate ordering and customization, please consider the following:

1. Specify Requirements: Clearly state the rated voltage, current, short-circuit breaking current, and any additional features such as isolating switches or communication functionalities.
2. Operating Conditions: Indicate the environmental conditions, such as altitude, temperature range, and pollution level, to ensure the breaker meets your site-specific needs.
3. Customization Requests: If you require non-standard configurations, enhanced protections, or integration with specific control systems, please provide detailed information.

For tailored solutions, unique configurations, or inquiries about non-standard applications, our technical team is available to assist you in meeting your precise requirements. Contact us today to discuss your needs.

FAQs for ZW20A-12 Vacuum Circuit Breaker

1. What are the key applications of the ZW20A-12 Vacuum Circuit Breaker?
   The ZW20A-12 is ideal for 12kV, 50Hz three-phase AC systems in distribution networks, substations, industrial plants, and rural power systems. It excels in managing load currents, overload currents, and short-circuit currents, making it a preferred choice for frequent switching and automated grid networks.
2. How does the ZW20A-12 ensure environmental reliability?
   This breaker uses SF6 gas insulation with advanced Toshiba VSP5 sealing technology, ensuring zero gas leakage. Its robust construction allows reliable operation in harsh environments, including extreme temperatures, high humidity, and pollution levels up to Grade V.
3. What smart functionalities are available in the ZW20A-12?
   The breaker supports smart grid integration with features like GSM messaging, real-time fault detection, auto reclosing, event recording, and remote monitoring and control, offering advanced capabilities for efficient power distribution management.
4. What are the maintenance requirements for the ZW20A-12?
   Thanks to its fully sealed structure and durable materials, the breaker requires minimal maintenance. The vacuum interrupters and SF6 gas chamber are designed to operate reliably for 10,000 mechanical cycles without significant upkeep.
5. Can the ZW20A-12 handle high short-circuit currents?
   Yes, it is designed to break short-circuit currents up to 20kA and handle peak dynamic currents of 50kA, ensuring robust performance and system protection during fault conditions.
6. How customizable is the ZW20A-12 for specific project needs?
   The breaker offers extensive customization options, including adjustable rated currents (400A–800A), integration of lightning arresters, UV-resistant coatings, and flexible mounting configurations, making it adaptable for diverse operational requirements. For tailored solutions, contact the technical team to discuss your specific needs.

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