China VSB-12 Indoor High-Voltage Vacuum Circuit Breaker Suppliers - Reliable Factory for 12kV Power Systems

The VSB-12 Indoor High-Voltage Vacuum Circuit Breaker is a robust solution tailored for 12kV power systems, making it an ideal choice for various indoor applications. Manufactured by top suppliers in China, this circuit breaker offers a range of rated currents from 630A to 4000A and boasts a short-circuit breaking capacity of up to 40kA. Designed for reliability, the VSB-12 ensures high insulation strength, mechanical endurance of 20,000 operations, and minimal contact resistance. It supports both AC and DC control voltages, featuring rapid opening and closing times and is engineered for long-term stability even under frequent switching conditions. Choose our factory for quality products that meet your high-voltage needs

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-Earth 42 (Across Isolating Distance 48)
		Impulse Withstand Voltage (Before and After Rated Breaking) / Rated Lightning Impulse Withstand Voltage (Peak)		Phase-to-Earth 75 (Across Isolating Distance 85)
9	Rated Short-Time Withstand Current Duration		s	4
10	Rated Operating Sequence			O-0.3s-CO-180s-CO
11	Mechanical Life		time	20,000
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		μΩ	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.

Frequently Asked Questions (FAQ)

Q What is the rated voltage of the VSB-12 High-Voltage Vacuum Circuit Breaker?

The VSB-12 has a rated voltage of 12kV and a maximum operating voltage of 12kV, making it suitable for medium-voltage distribution systems.

Q What is the mechanical life of the VSB-12 circuit breaker?

The VSB-12 is rated for 20,000 mechanical operations, ensuring long-term reliable performance in demanding environments.

Q What operating voltages are supported for the closing and opening mechanisms?

Both the rated closing and opening voltages support AC and DC 110V / 220V, providing flexible compatibility with different control systems.

Q What is the rated short-circuit breaking current of the VSB-12?

The VSB-12 supports rated short-circuit breaking currents of 20/25 kA, 31.5 kA, and 40 kA depending on the configuration selected, meeting various fault interruption requirements.

Q What is the rated operating sequence of the VSB-12?

The rated operating sequence is O – 0.3s – CO – 180s – CO, which defines the standard open-close cycle timing for safe and reliable circuit interruption.

Q What information is required when placing an order for the VSB-12?

When ordering, customers are required to provide: product name and model number with rated current, the number of poles, and the minimum order quantity. Please contact us with these details to receive an accurate quotation.