Overview

The ZN63 (VS1)-12kV Indoor High Voltage Vacuum Circuit Breaker is a three-phase AC 50Hz device with a rated voltage of 12kV, designed for industrial facilities, mining enterprises, power plants, and substations. It provides reliable control and protection for electrical equipment in areas requiring frequent operation. This breaker integrates the VET operating mechanism with the circuit breaker body, offering a compact and efficient design. It can be used as a fixed installation unit or equipped with a special advancement mechanism to form a handcart unit for flexible applications.

The breaker is compatible with KYN28A-12 (GZS) and XGN fixed switchgear panels and can adopt a solid-sealed post design for a smaller, maintenance-free solution with enhanced reliability. With its pollution-free, explosion-proof structure and high insulation levels, the ZN63 (VS1)-12 is ideal for modern power distribution systems, delivering high performance and flexibility for diverse operational needs.

Type designation of ZN63 (VS1)-12kV

The model designation for the ZN63(VS1)-12kV Indoor High Voltage Vacuum Circuit Breaker is structured as follows:

• Z: Vacuum circuit breaker.
• N: Indoor type.
• 63: Design sequence number.
• 12: Rated voltage (kV).
• /: Customizable configuration options.
• □: Rated Current (A): Specifies the rated current.
• □: Rated Short-Circuit Breaking Current (kA)

Environmental Conditions

1. Temperature: -10°C to +40°C (storage and transport allowed at -30°C).
2. Altitude: ≤1000m.
3. Humidity: Daily average ≤95%; monthly average ≤90%.
4. Seismic Intensity: ≤8.
5. Hazards: No fire, explosion, severe pollution, chemical corrosion, or intense vibration.
6. Special Requirements: For customized solutions, please contact our technical service team.

Technical Parameters 12kV Indoor High Voltage Vacuum Circuit Breaker

Item			Unit	20kA	25kA	31.5kA	40kA	50kA
Rated Voltage			kV	12
Maximum Operating Voltage			kV	12
Rated Current			A	630	1250	1250 1600 2000 2500	1250 1600 2500 3150	1250 2500 3150
Rated Short-Circuit Breaking Current			kA	20	25	31.5	40	50
Rated Short-Circuit Closing Current (Peak)			kA	50	63	80	100	125
Rated Peak Withstand Current			kA	50	63	80	100	125
4s Rated Short-Time Withstand Current			kA	20	25	31.5	40	50
Rated Insulation Level		Power Frequency Withstand Voltage (After Breaking)	kV	42 (Break 48)
		Impulse Withstand Voltage (After Breaking)	kV	75 (Break 85)
Rated Operating Sequence				Open–0.3s–Close Open–180s–Close
Mechanical Life			Times	10000
Rated Short-Circuit Current Breaking Times			Times	50
Operating Mechanism Rated Voltage			V	AC/DC 110, 220
Contact Opening Distance			mm	11 ± 1
Overtravel (Contact Spring Compression Length)			mm	4 ± 0.5
Three-Phase Closing Non-Synchronism			ms	≤2
Contact Closing Bounce Time			ms	≤2
Average Opening Speed (Pole 6mm Height)			m/s	0.9 ~ 1.2
Average Closing Speed			m/s	0.4 ~ 0.8
Opening Time	Maximum Operating Voltage		s	≤0.05
	Minimum Operating Voltage		s	≤0.08
Closing Time			s	≤0.1
Each Phase Main Circuit Resistance			μΩ	≤40
Allowed Cumulative Thickness of Moving and Stationary Contact Wear			mm	3

Technical Features of ZN63(VS1)-12kV Indoor Vacuum Circuit Breaker

Superior Circuit Breaker Performance

• • The arc extinguishing chamber and operating mechanism are integrated for seamless performance.
  • Designed for durability with a mechanical lifespan of over 10,000 operations.
  • Utilizes advanced copper-chromium alloy contacts and a longitudinal magnetic field structure for efficient arc extinguishing.

Enhanced Insulating Cylinder

• • Manufactured with the new APG process, providing improved insulation and structural stability.
  • Features reinforced ribs and skirt edges to enhance insulation levels and resist dynamic stress.
  • Effectively protects the vacuum chamber from foreign contamination while reducing the circuit breaker size.

Efficient Operating Mechanism

• • Equipped with a spring energy-storage system supporting both electric and manual operations.
  • Energy is efficiently transferred from the energy-storage spring to the dynamic contact via a precise link mechanism.
  • Features advanced damping technology to minimize rebound, ensuring smooth operation.
  • Low maintenance requirements with no need for frequent adjustments.

Outline and installation dimensions

For detailed drawings and installation dimensions of other circuit breaker models, as well as more precise installation guidelines, please contact us for further assistance.

Figure 1: Dimensions of the Handcart-Type ZN63(VS1)(800)

• Handcart Stroke: 200 ± 2mm.
• Meshing Size of Contacts: The dynamic and static contact meshing size is ≥15mm.

Rated Current (A)	630	1250	1600
Rated Short-Circuit Breaking Current (kA)	20, 25	25, 31.5, 40	31.5
Size of Matched Static Contact (mm)	Φ35	Φ49	Φ55

Figure 2: Dimensions of the Handcart-Type ZN63(VS1)(1000)

Figure 3: Dimensions of the Fixed-Type ZN63(VS1)(800)

Figure 4: Dimensions of the Fixed-Type ZN63(VS1)(1000)

Ordering Guidelines and Special Requirements

To ensure the ZN63(VS1)-12kV Indoor High Voltage Vacuum Circuit Breaker meets your specific needs, please provide the following information when placing your order:

1. Basic Specifications : Model and Type, Rated Voltage and Current, Short-Circuit Breaking Current

2. Environmental and Operating Conditions

3. Control Requirements: Control Voltage: Specify AC/DC 110V or 220V.Installation Type: Handcart or fixed unit.

4. Special Requests:  Non-standard configurations or additional certifications.

Customization Options

For non-standard designs, enhanced performance, or unique project needs, please contact our technical team. We are committed to delivering tailored solutions to meet your operational and environmental requirements.

Contact us today for assistance or to place your order!

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