bimetallic lug or bimetallic thimble is special type of thimble for connecting aluminum cable with copper bus or copper terminals.

In this article, we will discuss the structure and application of bimetallic terminals.

Problems with Cu/Al Joint

Aluminum oxide layer is formed which is highly resistance to current.The Joint heats up and results in burning of cable and subsequently end up in fire.

Due to different thermal coefficients of Al & Cu,loosening of joint occur

Bimetal Thimble Construction:

The electrolytic forged copper palm is friction-welded to the electrolytic aluminum barrel. Cu and Al molecules are bonded together to create a strong

and durable joint therefore achieving the best possible transition

Oxidation within the cable lug is prevented by protecting the internal surface with a specific grease with a very high dropping point.

Bimetal Thimble Application

The bimetallic cable lugs connectors are suitable for connecting LV, MV and HV stranded aluminium conductor cables including 11kV-33kV medium

voltage with conductor cross section areas 10sqmm-630sqmm