Magnetic-hydraulic trigger for circuit-breaker, has magnetic coil generating magnetic field within area of magnetic pole plate arranged at longitudinal end of casing, where core and fluid exhibit identical middle density

摘要

The trigger has an elongated casing (10), in which a ferromagnetic core (13) is arranged in a play-afflicted movable manner against an pressurization force of a spring (15) and against a braking force of a fluid (12) e.g. silicone oil, filled in the casing for movement absorption. The spring is arranged between the core and a longitudinal end of the casing. A magnetic coil (14) encloses the casing and generates a magnetic field (B) within an area of a magnetic pole plate arranged at a longitudinal end of the casing. The core and the fluid exhibit an identical middle density. The core is made of made of ferrousmagnetic material such as iron, cobalt, nickel and ferrite particle.