Static contact and switching device

Abstract

The invention discloses a static contact and a switching device using the static contact. The switching device comprises an insulating shell, a power supply wiring end, a moving contact and static contacts; the static contacts comprise a first static contact and a second static contact, wherein the second static contact is arranged on one side of the first static contact in the width direction of the switching device, and the resistor body is electrically connected with a power supply terminal of the switch device. According to the invention, the other high-resistance circuit is arranged in parallel with the low-resistance circuit, the low-resistance circuit bears normal working current, and the high-resistance circuit reduces the current when the current is broken to generate an arc, so that the arc energy is reduced, and the contact is protected to the greatest extent.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a static contact and a switch device. Background technique [0002] In the low-voltage electrical appliance industry, due to the presence of resistive loads, inductive loads, capacitive loads, and mixed loads, when each load is started or cut off, there is an inrush current greater than the rated current. Terminal appliances or power distribution appliances bring overload impacts of several times the rated current. For example, when the load is faulty and short-circuited, it will bring dozens of times the impact of short-circuit current to terminal appliances or power distribution appliances. Both overload current impact and short-circuit current impact will cause arcing, and the arc will burn or weld the copper-based contacts carrying the current, making the line unable to be connected or cut off, resulting in electrical accidents; for this reason, in the design ...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, an air circuit breaker proposed by Patent No. 02804534.3 uses the second circuit to limit the current when the current is turned on or off, but it uses a resistance alloy or steel plate to weld the contacts together, because the contact area is large For example, when using high-resistance materials such as iron-chromium-aluminum, the copper-based contacts will be melted due to the high temperature rise caused by the high resistance, so only medium-resistance materials can be used, and there is a problem of limited current limiting effect ;like figure 2 As shown, a contact device and a circuit breaker proposed in Patent No. 201220410921.1, which indirectly form a new conductive current-limiting circuit through the arc, which is greatly affected by the arc, may have failures, and the current-limiting effect is not direct. In addition, the above The two existing technologies are only applicable to snap-in rotary contacts, and cannot be applied to reversible rotary plug-in contacts

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