Meta Title: 12/24 kV Vacuum Circuit Breaker (VCB) – VT19 Indoor | TIANAN

Meta Description: TIANAN VT19 12/24 kV indoor vacuum circuit breaker for medium-voltage distribution. 75/125 kV impulse withstand, GB certified. For substations, solar, wind & industry.

H1 Title: TIANAN VT19 12/24 kV Indoor Vacuum Circuit Breaker

The TIANAN VT19-12/24 is a three-phase indoor vacuum circuit breaker (VCB) for 12 kV and 24 kV medium-voltage power distribution. It protects feeders, motors, transformers and capacitor banks in power substations, industrial plants, renewable energy projects and commercial buildings. Vacuum interrupter technology quenches the arc in milliseconds for reliable short-circuit protection and overload isolation at 50 Hz.

Technical Specifications

Applications

This indoor vacuum circuit breaker is designed for a wide range of medium-voltage scenarios:

Power Substations — reliable switching and fault isolation for 12 kV and 24 kV incoming and outgoing feeders.
Industrial Facilities — protects motors, transformers and capacitor banks in manufacturing plants.
Renewable Energy — safe grid interconnection for wind turbine step-up stations and solar farm collection systems.
Commercial Buildings — indoor switchgear rooms of high-rise towers, hospitals and large retail complexes.
Mining & Metallurgy — robust mechanical design and stable vacuum interruption in harsh industrial environments.
Key Features

Vacuum Interruption Technology — rapid arc quenching with minimal contact erosion for long service life and low maintenance.
High Insulation Reliability — 75 kV (12 kV) and 125 kV (24 kV) lightning impulse withstand voltage protects against surges and lightning strikes.
Stable Mechanical Performance — opening speed 0.9~1.3 m/s (12 kV) and 1.1~1.6 m/s (24 kV) for reliable fault clearance.
Wide Climate Range — operates from -15°C to +40°C.
Seismic Resistant — certified for seismic zones below Grade 8.
Flexible Operation Sequence — O-0.3s-CO-180s-CO supports rapid reclosing for grid stability.
Frequently Asked Questions (FAQ)

What is a vacuum circuit breaker (VCB)? A vacuum circuit breaker uses a vacuum to extinguish the electric arc when its contacts open. The vacuum interrupter quenches the arc in milliseconds, delivering fast, low-maintenance short-circuit protection for medium-voltage systems.

What is the difference between the 12 kV and 24 kV ratings? The VT19 is offered in two voltage ratings. Choose 12 kV for standard industrial and commercial distribution; choose 24 kV for higher-voltage substation feeders and large renewable-energy collection systems.

Where is the VT19 typically installed? In indoor switchgear rooms of power substations, factories, wind turbine step-up stations, solar farm collection systems, high-rise buildings, hospitals and shopping malls.

What does the operation sequence O-0.3s-CO-180s-CO mean? It describes the breaker’s auto-reclosing duty: Open, wait 0.3 s, Close-Open, wait 180 s, Close-Open. This supports rapid reclosing for grid stability after a fault.

Is the VT19 suitable for solar and wind projects? Yes. Its 75/125 kV lightning impulse withstand rating and stable mechanical performance make it well suited for wind step-up stations and solar collection systems connecting to the grid.

What are the operating limits of the VT19? Ambient temperature from -15°C to +40°C, altitude up to 1000 m, and seismic zone below Grade 8.