Overview of ZW7 High-Voltage Vacuum Circuit Breaker

The ZW7-40.5kV series outdoor high-voltage vacuum circuit breakers are three-phase AC devices operating at 50Hz with a rated voltage of 40.5kV, designed for outdoor high-voltage applications. Equipped with a spring-operated mechanism or an electromagnetic operating mechanism, these circuit breakers support both remote control for closing and opening operations and local manual operation. The design fully complies with GB1984 (High Voltage AC Circuit Breakers) national standards and meets the requirements of IEC-56 (High Voltage AC Circuit Breakers) international standards, ensuring exceptional performance and reliability.

1. ZW7-40.5kV Side-Mounted Type (left).    2.ZW7-40.5kV Center-Mounted Type (right).

Primarily used for the control and protection of 40.5kV transmission systems, the ZW7-40.5kV Outdoor High-Voltage Vacuum Circuit Breaker is well-suited for urban and rural power grids, as well as industrial enterprises. It integrates vacuum insulation with ceramic or epoxy insulators, using a columnar structure that is particularly effective in environments requiring frequent switching operations. Its sealed design provides excellent resistance to moisture, high voltage, and environmental challenges. The circuit breaker is non-flammable, explosion-proof, and features a long operational lifespan with minimal maintenance requirements, making it an efficient and practical solution for modern high-voltage power systems. Its compact and user-friendly design also ensures ease of installation and reliable operation in demanding conditions.

Type designation of ZW7 Vacuum Circuit Breaker

ZW7-40.5kV Model Explanation

• Z: Vacuum circuit breaker.
• W: Outdoor type.
• 7: Design sequence.
• 40.5: Rated voltage (kV).
• □: Rated current (A).
• □: Rated short-circuit breaking current (kA).

Operating Conditions for ZW7 Vacuum Circuit Breaker

1. Ambient air temperature: -30℃～+40℃;
2. Altitude: ≤ 2000m;
3. The wind speed: 3.2-10km/h;
4.Earthquake intensity: ≤8 level;
5.Minimum nominal creepage distance: 31mm/kV;
6Air pollution degree: Class IV.

Technical Specification

Item		Unit	Data
Rated Voltage		kV	40.5
Rated Current		A	1600	2000
Rated Short-Circuit Breaking Current		kA	25	31.5
Rated Short-Circuit Closing Current (Peak)			63	80
Rated Short-Time Withstand Current			25	31.5
Rated Peak Withstand Current			63	80
Rated Short-Time Duration		s	4
Rated Insulation Level	Lightning Impulse Withstand Voltage	kV	185
	1-Minute Power Frequency Withstand Voltage (Dry)		95
	1-Minute Power Frequency Withstand Voltage (Wet)		80
Rated Operating Sequence			Open–0.3s–close open–180s– open close
Rated Short-Circuit Breaking Operations		Times	20
Full Opening Time (Spring Operating Mechanism)		ms	≤80
Mechanical Life		Ti

Dimensions and Installation Sizes

1. Upper outgoing terminal	6. Mechanism box	11. Observation window
2. Vacuum arc-extinguishing chamber	7. Door	12. Insulated pull rod
3. Handhole cover plate	8. Lifting ring screw	13. Base
4. Lower outgoing terminal	9. Door handle	14. Support
5. Column insulator	10. Mechanism (inside the box)	15. Current transformer
		16. Bolt

Figure 1: ZW7-40.5kV Side-Mounted Type Dimensions and Installation Diagram

Figure 2: ZW7-40.5kV Vacuum Circuit Breaker Center-Mounted Type Dimensions and Installation Diagram

Ordering Information

1. Specify rated voltage, current, and breaking capacity.
2. Indicate the installation type (Side-Mounted or Center-Mounted).
3. Note any special requirements, such as enhanced durability, custom insulation, or system integration.

Customization Services

We provide tailored solutions for non-standard configurations, extreme environments, and specific operational needs.

Contact us for details or to discuss your requirements!

Technical FAQs for ZW7-40.5kV Vacuum Circuit Breaker

1. What are the key applications of the ZW7-40.5kV Vacuum Circuit Breaker?
   It is designed for 40.5kV transmission systems, urban and rural grids, and industrial enterprises requiring reliable fault protection and switching capabilities.
2. How does the ZW7 breaker ensure environmental reliability?
   Its sealed design with ceramic or epoxy insulators provides resistance to high humidity, Class IV pollution, and seismic intensity up to level 8.
3. What operational features does the ZW7 breaker offer?
   It supports remote control for automated systems and manual operation, making it versatile for various grid applications.
4. What is the mechanical lifespan of the ZW7 Vacuum Circuit Breaker?
   The breaker is rated for up to 10,000 mechanical operations, ensuring longevity in high-frequency switching environments.
5. Can the ZW7 breaker handle high short-circuit currents?
   Yes, it supports short-circuit breaking currents of up to 31.5kA and peak withstand currents of 80kA, ensuring robust performance during fault conditions.
6. What customization options are available for the ZW7 breaker?
   Options include side-mounted or center-mounted configurations, enhanced insulation, and tailored solutions for extreme environmental conditions or specific operational needs.

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