11KV MV Vacuum Circuit Breaker with Isolator Switch

The short-time withstand current of the main circuit meets 20kA (4s) and 25kA requirements(3s), The mechanical lifespan of the vacuum circuit breaker more than 10000 times, and the mechanical lifespan of the isolating switch is more than 3000 times.The short-term withstand current of the grounding switch meets 20kA (4s), and the mechanical life is 3000 times.

The KDSV-12D/630-20-S type 11KV MV Vacuum Circuit Breaker With Isolator Switch is usually used in medium-voltage power distribution and control system. This combination of vacuum circuit breaker with isolator utilized the superior arc-quenching capability and almost free maintenance of vacuum interrupters with the important safety function of a visible isolation gap provided by the disconnector.

This vacuum circuit breaker often used for indoor installation in 3kV to 40.5kV, 50/60Hz three-phase AC power distribution systems, this eletrical device is very important in modern switchgear, which can ensure operational safety, system reliability, and efficient power management in applications demanding frequent switching, high endurance, and a maintenance-free, oil-less equipments.

Appearance and Dimension

Modle and meanings

What is a vacuum circuit breaker?

The 11KV MV Vacuum Circuit Breaker With Isolator Switch is an advanced electrical switching device that interrupts current by separating its contacts inside a vacuum chamber, also called a vacuum interrupter. The vacuum serves as both the arc-quenching medium and the insulating medium, ensuring safe, reliable, and maintenance-free operation.

The design of a VCB relies on three essential subsystems:

1.Vacuum Interrupter

Insulating Envelope: Ceramic or glass casing maintaining high vacuum inside.

Contacts: Made of specialized copper alloys, often generating a longitudinal magnetic field to stabilize and spread the arc, enhancing performance.

Shielding System: Metallic shields protect the insulating envelope from vapor deposition and maintain a uniform electric field.

2.Operating Mechanism

Provides energy to open and close contacts.

Common types: spring-operated systems (manual or motor-charged) and electromagnetic solenoids, enabling fast, reliable switching.

3. Support Frame and Insulation

Houses the interrupter and mechanism securely.

Includes main frame, insulation, and terminals for external connections.

Ensures a compact, stable, and mechanically robust assembly.

Key Advantages

1. Compact and lightweight design for easy installation.

2. High durability with minimal maintenance required.

3. Repeated operation without performance degradation.

4. Suitable for medium-voltage power distribution, industrial systems, and environmentally sensitive sites.

Technical Parameters

Application scope

The safe, reliable, and frequent switching is very important in power distribution systems, 11KV MV Vacuum Circuit Breaker With Isolator Switch is the preferred option. the main application of the cacuum circuit breaker is the following:

Industrial Device: The vacuum vircuit breaker can control and protect important electrical equipment such as transformers, capacitor banks, and large motors.

Power Generation & Substations: Used for protecting feeders and within auxiliary power systems.

Commercial Power Distribution: Installed in space-saving switchgear, such as metal-clad (including withdrawable) or fixed switchboards.A very important advantage of the vacuum circuit breaker is no any oil., which can make the vacuum circuit breaker very suitable for environmentally sensitive sites, areas with a high fire risk, and any situation where need reducing maintenance.

Circuit Breaker VS Disconnector

If they are mounted in a single assembly, the vacuum circuit breaker has fundamentally distinct and complementary functions with the Isolator:

Vacuum Circuit Breaker:

Primary Function: make, carry, and break load currents under normal conditions, and to interrupt fault currents under abnormal conditions.It is designed as a oad-breaking and fault-breaking device.

Operation:Can be operated under load. The VCB's vacuum interrupter is used to safely extinguish the high-energy arc generated when the current is interrupted.

Safety:The vacuum circuit breaker will provides protection for downstream equipment by clearing faults, coordinated with protection relays.

Disconnector:

Primary Function:To provide a visible, physical air gap in the de-energized circuit for isolation and safety when the equipment need maintenance. It is strictly an off-load device.

Operation:Must only be operated when the circuit is de-energized (i.e., after the upstream circuit breaker has opened). It has no designed arc-quenching capability and cannot safely interrupt load or fault current.

Safety:The isolaor can ensures a safe isolation point, allowing the operator to work on the downstream section with verified no exist any voltage.

Vacuum circuit breakers are protective and control devices used for current interruption, while disconnecting switches are passive safety devices used to create visible isolation. Our 11kV MV Vacuum Circuit Breaker With Isolator Switch enables a safe circuit-breaking sequence: the vacuum circuit breaker disconnects the circuit, followed by the disconnecting switch, forming an easily maintainable isolation point, typically visible through an observation window or mechanical indicator. This combination of vacuum circuit breaker and disconnecting switch is a crucial and reliable component in medium-voltage switchgear.

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