LeTesteur d'interrupteur à vide under Wuhan UHV can help many power workers conduct various power tests more conveniently.

A vacuum circuit breaker (VCB) is a type of circuit breaker that utilizes a high vacuum environment (pressure below 10 ⁻⁴ Pa) as an arc extinguishing and insulating medium. Its core working principle is to use the excellent insulation performance and arc extinguishing ability of vacuum to quickly and reliably cut off current, especially in the event of faults (such as short circuits).

1.Core Component: Sealed Vacuum Interrupter Chamber (contains moving & fixed contacts).

2.Breaking Process:

Contacts separate → Creates a vacuum arc (sustained by vaporized metal).

At AC current zero crossing, arc energy input is minimal.

Vacuum Advantage: Minimal particles → Charged particles (electrons/ions) in the arc plasma diffuse extremely rapidly and condense onto the cool condensing shields/contacts.

Instant Insulation Recovery: The gap almost immediately returns to a high-insulation vacuum state. Its dielectric strength far exceeds the system's recovery voltage.

Current is completely interrupted.

3.Key Advantage: Extremely rapid dielectric (insulation) strength recovery (due to the vacuum).

4.Result: Capable of quickly and reliably interrupting current (especially short-circuit current), widely used in medium-voltage power distribution systems.