VSB-12 Indoor High-Voltage Vacuum Circuit Breaker

The VSB-12 Indoor High-Voltage Vacuum Circuit Breaker is designed for 12kV power systems, offering rated currents from 630A to 4000A and short-circuit breaking capacity up to 40kA. This VSB-12 Indoor High-Voltage Vacuum Circuit Breaker ensures reliable performance with high insulation strength, mechanical endurance of 20,000 operations, and low contact resistance. Suitable for a wide range of indoor applications, the VSB-12 Indoor High-Voltage Vacuum Circuit Breaker supports both AC and DC control voltages, features rapid opening/closing times, and is built for long-term stability under frequent switching conditions.

product details

Type Designation

Brand:	MINGRI
Product Name:	High-Voltage Vacuum Circuit Breaker
Model:	VSB-12
Rated Voltage:	12kV
Rated Current:	63A
Rated Frequency:	50Hz
Altitude:	≤1000 meters
Mechanical Life:	20,000 operations

Technical Parameters

No.	Item		Unit	Value
1	Rated Voltage		kV	12
2	Maximum Operating Voltage		kV	12
3	Rated Current		A	630 1250	630 1250 1600 2000 2500 3150	1250 1600 2000 2500 3150 4000
4	Rated Short-Circuit Breaking Current (Rated Short-Time Withstand Current - RMS Value)		kA	20/25	31.5	40
5	Rated Short-Circuit Making Current (Peak)		kA	50/63	80	100
6	Rated Peak Withstand Current(Rated Peak Withstand Current-Peak)		kA	50/63	80	100
7	4S Rated Short-Circuit Withstand Voltage		kA	20/25	31.5	40
8	Rated Insulation Level	Power-Frequency Withstand Voltage (1min) (Before and After Rated Breaking)	KV	Phase-to-Earth42(Across Isolating Distance48)
		Impulse Withstand Voltage (Before and After Rated Breaking)/Rated Lightning Impulse Withstand Voltage (Peak)		Phase-to-Earth75(Across Isolating Distance85)
9	Rated Short-Time Withstand Current Duration		s	4
10	Rated Operating Sequence			O-0.3s-CO-180s-CO
11	Mechanical Life		time	20000
12	Rated Short-Circuit Current Breaking Operations		time	50
13	Operating Mechanism Rated Closing Voltage (DC)		V	AC、DC 110,220
14	Operating Mechanism Rated Opening Voltage (DC)		V	AC、DC 110,220
15	Contact Gap		mm	11±1
16	Over-Travel(Contact Spring Compression Length)		mm	3.5±0.5
17	Three-Phase Contact Bounce Time (During Opening/Closing)		ms	≤2
18	Contact Bounce Time During Closing		ms	≤2
19	Average Opening Speed		m/s	0.9-1.2
	Average Closing Speed		m/s	0.5~0.8
20	Opening time	At Maximum Operating Voltage	s	≤0.05
21		At Minimum Operating Voltage		≤0.08
22	Closing time		s	0.1
23	Main Circuit Resistance		UΩ	630≤50		1250≤45
24	Permissible Cumulative Wear Thickness of Moving/Fixed Contacts		mm	3

product Display

VSB-12 High-Voltage Vacuum Circuit Breaker

Outline and Installation Dimension

Inside the brackets: 275mm phase spacing

Ordering Instructions

Order Specifications Required from Customers:
a) Product Name:Model Number.Rated Current;
b) Rated Current.Number of Poles;
c) Minimum order Quantity.