The 12kV 630A-5000A Indoor Medium Voltage Vacuum Circuit Breaker for Switchgear is specifically designed for indoor switchgear with a rated voltage of 12kV and an AC frequency of 50/60Hz. It features a reliable modular operating mechanism and a robust structural design, providing stable closing and opening performance with convenient operation and maintenance.

The circuit breaker is widely applicable to industrial and mining enterprises, power distribution systems, and power grid equipment, meeting various medium-voltage switching, control, and protection requirements. It can be configured as a withdrawable handcart unit for integration with KYN28A-12 switchgear, allowing convenient installation, withdrawal, inspection, and maintenance. It can also be configured as a fixed unit with the corresponding mechanical interlocking components, making it compatible with XGN2 and other fixed-type switchgear cabinets.

With flexible installation options, reliable electrical performance, and a modular design, the 12kV 630A–5000A vacuum circuit breaker provides a dependable solution for a wide range of medium-voltage power distribution applications.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000/5000
4	Rated Power Frequency Withstand Voltage	kV	48(Across the contact gaps) / 42(To Ground)
5	Rated Lightning Impulse Withstand Voltage	kV	75
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40/50
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100/125
8	Rated Withstand Current (Peak)	kA	63/80/100/125
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Times	E2
11	Mechanical Endurance	Times	30000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	9±1
2	Contact Overtravel	mm	3.5±0.5
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.1±0.2
5	Rated Contact Pressure	N	2500±200N(25kA) 3100±200N(31.5kA) 4800±300N(40kA) 6000±500N(50kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

The 12kV 630A-5000A Vacuum Circuit Breaker offers numerous advantages:

Circuit Breaker Performance

Meets E2-C2-M2 performance requirements, ensuring reliable electrical and mechanical endurance as well as stable switching performance under demanding operating conditions. This makes the circuit breaker suitable for applications requiring frequent operation and reliable fault interruption.

Easy maintenance

The modular mechanism design allows for easy replacement of closing and opening coils without dismantling other components. No testing or adjustment is required after replacement, enabling users to perform replacements independently and simplifying subsequent maintenance.

Excellent conductivity

Features a well-designed conductive circuit that meets the temperature rise requirements at 1.1 times the rated current, ensuring reliable current-carrying capacity and stable electrical performance. The optimized design also helps reduce heat accumulation during continuous operation and enhances the overall reliability of the circuit breaker.

Wide application range

The product series covers a broad range of applications, with rated currents from 630A to 5000A and rated breaking currents from 20kA to 50kA. It is suitable for environments at altitudes up to 4500 meters and operating temperatures ranging from -40°C to 40°C.

Supports intelligent customization

a. Wireless Temperature Monitoring: Includes a self-powered design for safety and maintenance-free operation.

b. Mechanical Characteristics Monitoring: Provides real-time monitoring of circuit breaker operating data to detect and resolve potential issues early.

c. Motorized Cabinet Entry: Enables remote operation to ensure personal safety.

d. Partial Discharge Testing: Detects real-time component aging to enhance reliability.

Product Applications

The 12kV 630A-5000A Vacuum Circuit Breaker is widely used in various applications, including:

1. Power Plants
Used for power distribution, equipment protection, and reliable switching in power generation systems.

2. Industrial Fields (Chemical, Steel, Petroleum, Coal, etc.)
Suitable for industrial power distribution systems, providing reliable control and protection for motors, transformers, and other electrical equipment.

3. Power Grid Systems
Applied in medium-voltage distribution networks for switching, control, and fault protection, helping ensure stable and reliable power supply.

4. Power Infrastructure
Suitable for substations, distribution facilities, and other power infrastructure projects requiring reliable medium-voltage switching and protection.