VZF(R)-12 Series Indoor AC High Voltage Vacuum Load Break Switch

Our VZF(R)-12 indoor AC high voltage vacuum load switch is a high-performance solution for 12kV distribution networks, featuring a maintenance-free vacuum interrupter and optional fuse protection.

• Rated at 12kV, 630A (125A with fuse), with 50kA short-circuit making and 20kA short-time withstand current.

• Vacuum interruption technology ensures superior breaking capacity for transformers (1250kVA) and cables (16A charging current), with mechanical life of 10,000 operations.

• Low partial discharge level ≤5pC enhances insulation longevity; power-frequency withstand voltage 42kV, lightning impulse 75kV for reliable insulation performance.

• Compact design with flexible mounting dimensions (650/800/1000mm cabinet widths) for easy integration into air-insulated switchgear.

• Wide operating temperature range (-15°C to +40°C, storage at -30°C) and seismic withstand (Magnitude 8) for harsh environments.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

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Product Overview

VZF(R)-12 Indoor AC High Voltage Vacuum Load Switch is a new generation of vacuum switchgear developed based on a unique design concept and in response to market demands. It is widely used in indoor armored air-insulated switchgear. It complies with the standards GB3804-2004 and GB16926-1997. Under normal operating conditions, as long as it operates within the technical parameters of the vacuum switch, it ensures safe and reliable operation in power grids of corresponding voltage levels.

Type Designation

VZF(R)-12 / T □ - □ - □ - □ - □ - □

- Vacuum load switch

- Fuse

- Rated voltage (kV)

- Operating mechanism: T represents spring-operated mechanism

- Rated current (A)

- Rated short-circuit breaking current (kA)

- Control voltage type

- Control voltage (V)

- Distance between poles (mm)

- Phase spacing (mm)

Operating Conditions

1. Ambient temperature: not exceeding +40°C, not lower than -15°C (storage and transport permitted at -30°C).

2. Altitude: not exceeding 1000m.

3. Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%; saturated vapor pressure daily average not exceeding 2.2×10⁻³ MPa, monthly average not exceeding 1.8×10⁻³ MPa.

4. Seismic intensity: not exceeding magnitude 8.

5. Locations free from fire, explosion hazards, severe pollution, chemical corrosion, and intense vibration.

Technical Specifications

No.	Parameter	Unit	Value 1	Value 2
1	Rated voltage	kV	12	12
2	Power-frequency withstand voltage (phase-to-phase and earth)	kV	42	42
3	Lightning impulse withstand voltage (phase-to-phase and earth)	kV	75	75
4	Rated current	A	630	125 (for fuse)
5	Rated short-circuit breaking withstand current	kA	50 (for fuse)	-
6	Rated short-time withstand current	kA	20	-
7	Rated peak withstand current	kA	50	-
8	Rated short-circuit making current	kA	50	-
9	Rated cable charging breaking current	A	16	-
10	Rated AC breaking current	A	3150	-
11	Breaking capacity for no-load transformer	kVA	1250	-

Outline and Mounting Dimensions

Cabinet Width (mm)	P (mm)	A (mm)	B (mm)	C (mm)	E (mm)	Weight (kg)
650	150	500	530	490	203	120
800	210	650	680	640	278	140
1000	275	850	880	840	378	160

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