FZN66-12D/T630-25 Three-Position Vacuum Load Break Switch

The FZN66 series load switches and their combined electrical apparatus are developed by our factory through the digestion and absorption of advanced foreign technology, combined with improvements based on the requirements of domestic users.

Product Overview

The FZN66 series hv switch load devices and their combined electrical apparatus are advanced high-voltage products developed using absorbed foreign technology and improved for domestic needs. These hv switch units meet the standards GB/T3804 "3~6kV AC High-Voltage Load Switches" and GB/T16926 "AC High-Voltage Load Switch-Fuse Combination Electrical Apparatus." Designed for 3.6–12 kV, 50 Hz three-phase systems, the hv switch provides reliable power distribution. Each unit also functions as a load switch circuit, offering efficient energy reception and distribution for ring main units, box-type substations, and various power distribution equipment.

Model Meaning

Main Technical Parameters

No.	Item	Unit	Vacuum Load Switch		Vacuum Load Switch-Fuse Combination Appliance FZRN64-12(D)/T200-31.5
No.	Item	Unit	FZN66-12(D)/T630-25	FZN66-12(D)/T1250-25
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50
3	Rated Current	A	630	1250	200
4	Rated Short-time Withstand Current	kA	25
5	Rated Peak Withstand Current	kA	63
6	Rated Short-circuit Making Current	kA	63		80
7	Rated Active Load Breaking Current	A	1250		1250
8	Rated Loop-breaking Current	A	1250		1250
6	No-load Transformer Breaking	kVA	2000 20
10	Earth Fault Current	A	20
11	Line and Cable Charging Current under Earth Fault Conditions	A	20
12	Rated Short-circuit Breaking Current	kA	31.5/50(Determined by the fuse)
13	Rated Transfer Current	A	3150
14	Fixed Breaking Time	ms	45
15	Power Frequency Withstand Voltage, 1min	kV	Phase-to-Phase, Phase-to-Ground, Vacuum Break: 42; Isolation Break: 48
16	Lightning Impulse Withstand Voltage	kV	Phase-to-Phase, Phase-to-Ground, Vacuum Break: 75; Isolation Break: 85
17	Mechanical Life	times	>10000

Working Condition

Ambient Air Temperature: Upper limit +40°C; Lower limit -25°C (storage and transportation allowed at -30°C).
Altitude: 1000m.
Relative Humidity: Daily average not exceeding 95%; Monthly average not exceeding 90%.
Seismic Intensity: Not exceeding 8 degrees.
The surrounding air should not be significantly polluted by corrosive or flammable gases, water vapor, etc.
Locations without frequent severe vibration.
Pollution Level: Class II.

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