Vacuum circuit breaker without energy storage

What is a vacuum circuit breaker (VCB)?

Over the last decades Vacuum Circuit Breakers (VCBs) are the most preferred switching devices in the medium voltage levels up to 52 kV. More than 80% of today’s new installation employs vacuum switching technology .

What is a vacuum circuit breaker?

Circuit breakers play a crucial role in protecting electrical systems from damage caused by overcurrents and short circuits. Among the various types of circuit breakers available, the vacuum circuit breaker (VCB) stands out for its reliability, efficiency, and performance.

What are the advantages of vacuum circuit breakers?

The use of Vacuum Circuit Breakers offers several advantages over other types of circuit breakers: VCBs are known for their high reliability, with fast and efficient arc interruption capabilities. Due to their simple and robust design, VCBs require minimal maintenance, resulting in cost savings and increased uptime.

How many cylinders does a vacuum circuit breaker have?

Vacuum circuit breakers typically have one or more cylinders per pole consisting of interrupters. For voltages up to 36 kV, single interrupter VCBs are usually used, and for voltages of 725 kV and above, multi-unit VCBs are made.

What does a vacuum interrupter do?

Vacuum Interrupter: The vacuum interrupter is the core component of a VCB. It consists of a fixed contact and a moving contact enclosed in a vacuum-sealed ceramic or glass envelope. When the circuit breaker is closed, the contacts are in contact, allowing current to flow. When the circuit breaker is tripped, the contacts separate, creating an arc.

Which circuit breaker is best for arc extinction?

Vacuum is a superior dielectric and the best medium for arc extinction in circuit breakers. For medium voltage (e.g., up to 38 kV), the vacuum circuit breaker is considered the closest to an ideal circuit breaker. The illustration on the right shows the formation of an arc when the contacts of the VCB open.