Wholesale VS1-12/24 withdrawable indoor high voltage vacuum circuit breaker Supplier, Companies

Type Designation

Normal Use Environment

• Ambient air temperature: Upper limit +40°C, Lower limit -15°C.
• Altitude: ≤ 1000m (if higher altitude is required, the rated insulation level shall be increased accordingly).
• Seismic intensity: Not exceeding 8 degrees.
• Relative humidity: Daily average of air not more than 95%, monthly average not more than 90%.
• Installation sites: Locations free from fire, explosion hazard, severe pollution, chemical corrosion, and violent vibration.

Technical Parameters

Product Display

Outline and Installation Dimensions

1. Drawing of Overall Dimensions for VS1-12 Withdrawable Type (Phase Distance 150mm) Circuit Breaker

Rated Current (A)	630	1250
Rated Short-Circuit Breaking Current (kA)	20, 25, 31.5	25, 31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49
Phase Distance (mm)	150 ± 1.5

2. Drawing of Overall Dimensions for VS1-12 Withdrawable Type (Phase Distance 210mm) Circuit Breaker

Rated Current (A)	630	1250	1600
Rated Short-Circuit Breaking Current (kA)	20, 25, 31.5	25, 31.5, 40	31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49	Φ55
Phase Distance (mm)	210 ± 1.5

3. Drawing of Overall Dimensions for VS1-12 Withdrawable Type (Phase Distance 275mm) Circuit Breaker

Rated Current (A)	1600, 2000	2500, 3150
Rated Short-Circuit Breaking Current (kA)	31.5, 40	31.5, 40
Matching Fixed Contact Size (mm)	Φ79	Φ109
Phase Distance (mm)	275 ± 1.5

4. Drawing of Overall Dimensions for ZN63A(VS1)-24 Fixed Type Circuit Breaker

Rated Current (A)	630	1250	1600
Rated Short-Circuit Breaking Current (kA)	20, 25, 31.5	25, 31.5, 40	31.5
Matching Fixed Contact Size (mm)	Φ35	Φ49	Φ55
Phase Distance (mm)	275 ± 1.5

Rated Current (A)	1600, 2000	2500, 3150	4000
Rated Short-Circuit Breaking Current (kA)	31.5, 40	31.5, 40	40
Matching Fixed Contact Size (mm)	Φ79	Φ109
Phase Distance (mm)	275 ± 1.5

Arc Extinguishing Principle

The ZN63A(VS1)-12/24 series circuit breaker utilizes a vacuum interrupter with a high degree of vacuum. During normal opening or short-circuit interruption, the moving contact is driven by the operating mechanism, causing it to separate from the fixed contact and generate an arc between them.

Due to the special design of the moving and fixed contacts, an axial magnetic field is generated between them. This field controls the arc, causing it to burn uniformly and move across the contact surface while maintaining a low arc voltage. When the arc current naturally passes through zero, the remaining ions, electrons, and metal vapor, under the influence of the electromagnetic field, quickly recombine or condense on the contact surfaces and the shield. The dielectric strength across the interrupter gap is rapidly restored, thereby extinguishing the arc and achieving the purpose of interruption.