VBF(R)-12 Center-mounted fixed vacuum load switch-fuse combination

The VBF(R)-12 Center-mounted fixed vacuum load switch-fuse combination is a compact and reliable medium-voltage protection device. Designed for modern switchgear, it integrates a vacuum load break switch with a fuse in a fixed center-mounted structure. With a rated voltage of 12kV, the VBF(R)-12 Center-mounted fixed vacuum load switch-fuse combination offers high breaking capacity and excellent insulation performance. Its epoxy-sealed poles provide strong resistance to contamination and humidity. The modular mechanism ensures easy maintenance and long service life. Ideal for transformer protection, feeder circuits, and industrial power systems, the VBF(R)-12 delivers safe and efficient operation with minimal upkeep.

product details

Type Designation

1	Vacuum Load Break Switch
2	Fuse
3	Rated Voltage (kV)
4	Operation Mode: T represents Spring-operated
5	Rated Current (A)
6	Rated Short-circuit Breaking Current (kA)
7	Operating Voltage Category
8	Operating Voltage (V)
9	Pole Pitch / Phase Spacing (mm)
10	Phase Spacing (mm)
Example: VBF(R)-12/T125-50-AC220-275-210 It means ordering a combined apparatus for 800mm cabinet width, with a rated voltage of 12kV, rated current of 125A, short-circuit breaking current of 50kA, operating voltage AC220V, phase spacing of 275mm, and contact gap (pole pitch) of 210mm.

Technical Parameters

Mechanical Characteristics

No.	Item	Unit	Parameters
1	Contact Gap	mm	8-10
2	Contact Pressure,Spring Travel	mm	3~5
3	Phase-to-phase Center Distance	mm	150/210/275
4	Opening/Closing Asynchronism	ms	≤2
5	Contact Bounce Time (during closing)	ms	≤3
6	Average Closing Speed	m/s	0.4~0.8
7	Average Opening Speed	m/s	1.0-1.4
8	Closing Time (at rated operating voltage)	ms	≤60
9	Opening Time (at rated operating voltage)	ms	≤30
10	Main Circuit Resistance	μΩ	≤250
11	Permissible Wear Thickness of Moving/Fixed Contacts	ms	1-3

Technical Parameters

No.	Name	Unit	Parameters
No.	Name	Unit	VBF-12/T630-20 Vacuum Load Break Switch	VBFR-12/T125-50 Vacuum Load Break Switch-Fuse Combination Apparatus
1	Rated Voltage	kV	12	12
2	Power Frequency Withstand Voltage (phase-to-phase, phase-to-earth)	kV	42	42
3	Lightning Impulse Withstand Voltage (phase-to-phase, phase-to-earth)	kV	75	75
4	Rated Current	A	630	125(Fuse)
5	Rated Short-circuit Breaking Current	kA	-	50(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 Transfer Current	A	-	3150
11	No-load Transformer Switching	kVA	1250
12	Electrical Endurance	time	10000
13	Partial Discharge Level	PC	≤5

product Display

Installation and Overall Dimensions

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