VSY2-12GD Miniaturized Three-Position High Voltage Vacuum Circuit Breaker

VSY2-12GD is a compact three-position high-voltage vacuum circuit breaker designed for 12kV power distribution systems. It integrates a disconnector, load switch, and earthing switch in one unit with a highly insulated vacuum arc-extinguishing structure, delivering strong electrical performance and reliable operation. Equipped with complete mechanical interlocks, it ensures full compliance with switchgear five-prevention requirements for enhanced operational safety. Supporting flexible manual and motorized operation, it features a visible break after opening, stable short-circuit protection, and long mechanical endurance. Its small size, lightweight design, and flexible installation make it ideal for compact switchgear applications.

product details

Main Features

● Adopts vacuum arc-extinguishing composite insulation structure, featuring high insulation level and excellent electrical performance.
● Integrates disconnector, load switch and earthing switch in one unit, featuring compact structure, small size and light weight.
● Flexible installation methods, with optional operation modes: manual, motorized, and manual closing & electrical opening.
● Adopts rotary disconnector with visible break after opening.
● The load switch equipped with fuses has short-circuit protection function and can replace conventional circuit breakers.
● Mechanical interlocks are set between the disconnector, load switch and earthing switch to meet the "five-prevention" requirements of switchgear.

Technical Parameters

No.	Name	Unit	Load Switch	Combined Electrical Apparatus
1	Rated Frequency	Hz	50	50
2	Rated Voltage	kV	12	12
3	1min Power Frequency Withstand Voltage	kV	42kV between phases, to ground and at vacuum break / 48kV at isolation break	Same as left
4	Rated Lightning Impulse Withstand Voltage (Peak)	kV	75kV between phases, to ground and at vacuum break / 85kV at isolation break	Same as left
5	Rated Current	A	630	Maximum rated current of fuse: 125, 200
6	Rated Short-circuit Breaking Current	kA	-	31.5
7	Rated Active Load Breaking Current	A	630	-
8	Rated No-load Transformer Breaking Current	-	63	-
9	Rated Closed-loop Breaking Current	A	630	-
10	Rated Short-time Withstand Current (4s)	kA	25	-
11	Rated Peak Withstand Current	kA	63	-
12	Rated Short-circuit Making Current (Peak)	kA	50	50
13	Rated Transfer (Make) Current	A	1700 (3150)	Same as left
14	Mechanical Endurance	Times	10000	Same as left