Dual-power manual change-over switch

Abstract

The invention discloses a dual-power manual change-over switch, and belongs to the field of electrical equipment. The switch comprises a manual operation mechanism with a handle, and a contact chamber with binding posts. The binding posts include two power binding posts and a load binding post. The binding posts are provided with connection columns, and each connection column is partially embedded into the corresponding binding post and is in interference fit with the corresponding binding post; each connection column is provided with a conductive first columnar part in interference fit with an electric busbar, each first columnar part is internally and coaxially provided with a conductive second columnar part in interference with the corresponding first columnar part, and the thermal coefficient of expansion of the second columnar parts is larger than that of the first columnar parts. The switch has the advantages that more conductive area is produced with the same splicing length, the electric current density is reduced, and low temperature rising of the binding posts is achieved; the number of busbars is reduced, and resources are saved; the electric clearance or safety distance is increased, and the electric safety of equipment is improved.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a dual power supply manual transfer switch. Background technique [0002] In the existing power complete equipment factory, the construction workers install the dual power supply manual transfer switch in the power distribution cabinet. The terminals of the dual power supply manual transfer switch are usually directly connected with the power busbar, and the power busbar is directly connected to the terminal block. The connecting terminal and the power busbar are usually overlapped and lapped, and then fastened with bolts. Such as image 3 and Figure 4 As shown, this connection method needs to overlap the busbar and the terminal by a certain length, so that the current density of the contact surface can be maintained within a certain range, so that the temperature rise at the connection can meet the relevant standards. In order to reduce the temperature rise at the joint, it ...

AI Technical Summary

Problems solved by technology

And increasing the overlap length will increase the amount of busbars, thereby increasing the manufacturing cost

The fastening bolts will reduce the electrical clearance or safety distance between conductive parts and non-conductive parts. In order to keep the electrical clearance or safety distance unchanged, it is necessary to increase the distance between the terminal and the non-conductive Large spacing will inevitably result in larger dimensions of the entire dual power manual transfer switch

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