Low voltage fuse disconnect switch

Abstract

The invention discloses a low-voltage fuse-type isolating switch, which includes a moving end of an insulating pillar, a static end of an insulating pillar, a moving contact plate, a static contact plate, a static arc striking plate, a moving arc striking plate, an arc-extinguishing carbon brush, a static contact knife, The moving contact knife, the insulating pull rod and the melting piece; the moving end of the insulating post and the bottom of the static end of the insulating post are installed on the base, the moving contact plate and the static contact plate are respectively installed on the moving end of the insulating post and the static end of the insulating post, and the static contact knife One end is pivotally connected to the static contact plate, the other end of the static contact knife is connected to one end of the moving contact knife through an insulating pull rod, the static contact knife and the moving contact knife are electrically connected through a fuse, and the static arc striker is installed on the moving contact On the board, the moving arc striking plate is installed on the other end of the moving contact knife, and the arc extinguishing carbon brush is installed on the moving arc striking plate corresponding to the static arc striking plate. The contact plays the role of arc extinguishing, avoiding the instantaneous large current generated when the moving contact knife and the moving contact plate are in contact with the switch, thereby protecting the load equipment.

Description

technical field [0001] The invention relates to a low-voltage fuse type isolating switch. Background technique [0002] Isolating switch is a commonly used electrical appliance that plays an isolation role in the circuit. The low-voltage fuse-type isolating switch is a kind of isolating switch, which can ensure that the circuit is connected and disconnected under load, and has reliable over-current or short-circuit safety breaking protection. [0003] In the prior art, the structure of a low-voltage fuse-type isolating switch is mainly composed of a moving end of an insulating post, a static end of an insulating post, a moving contact plate, a static contact plate, a static contact blade, a moving contact blade, an insulating pull rod and a fuse. The moving end of the insulating post and the static end of the insulating post are installed on the base at a certain distance, the moving contact plate and the static contact plate are respectively installed on the top of the mov...

AI Technical Summary

Problems solved by technology

[0005] The existing low-voltage fuse-type isolating switch, because the circuit is connected directly by the contact of the moving contact knife made of copper-plated silver with the moving contact plate, it is easy to generate a momentary high current when the circuit is connected, so it is very easy to cause damage to the load equipment

Moreover, the static contact knife is generally pivoted by an ordinary equal-diameter circular shaft, and the circular shaft and the sleeve rely on extrusion and fit, which is either very laborious to install and disassemble, or easy to install and prone to loosening, which affects the normal operation of the isolating switch. use

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