An electrical connector (210, 310, 410), comprising: a first bus bar (214, 314, 414) formed of parallel first and second layers (236, 238, 336, 338, 436, 438) of electrically conductive material mechanically and electrically joined; a second bus bar (230, 330, 430), wherein ends of the first and second layers (236, 238, 336, 338, 436, 438) of the first bus bar (214, 314, 414) are separated so that the second electrical bus bar (230, 330, 430) may be received between them; the connector being characterized by: a contact button (212, 312, 412) having a first layer formed of a first electrically conductive material that is attached to the first bus bar or the second bus bar (230, 430) and having a second layer formed of a second electrically conductive material clad to the first layer; and a clamp assembly (224, 324, 424) including a retaining band (226, 326, 426) surrounding the first bus bar (214, 314, 414) and the second bus bar (230, 330, 430) having a spring (228, 328, 428) configured to provide a contact force between the contact button (212, 312, 412) and the first bus bar (214, 414) or the second bus bar when the second bus bar (230, 330, 430) is disposed between the parallel first and second layers (236, 238, 336, 338, 436, 438) of the first bus bar (214, 314, 414). a first bus bar (214, 314, 414) formed of parallel first and second layers (236, 238, 336, 338, 436, 438) of electrically conductive material mechanically and electrically joined; a second bus bar (230, 330, 430), wherein ends of the first and second layers (236, 238, 336, 338, 436, 438) of the first bus bar (214, 314, 414) are separated so that the second electrical bus bar (230, 330, 430) may be received between them; the connector being characterized by: a contact button (212, 312, 412) having a first layer formed of a first electrically conductive material that is attached to the first bus bar or the second bus bar (230, 430) and having a second layer formed of a second electrically conductive material clad to the first layer; and a clamp assembly (224, 324, 424) including a retaining band (226, 326, 426) surrounding the first bus bar (214, 314, 414) and the second bus bar (230, 330, 430) having a spring (228, 328, 428) configured to provide a contact force between the contact button (212, 312, 412) and the first bus bar (214, 414) or the second bus bar when the second bus bar (230, 330, 430) is disposed between the parallel first and second layers (236, 238, 336, 338, 436, 438) of the first bus bar (214, 314, 414). a contact button (212, 312, 412) having a first layer formed of a first electrically conductive material that is attached to the first bus bar or the second bus bar (230, 430) and having a second layer formed of a second electrically conductive material clad to the first layer; and a clamp assembly (224, 324, 424) including a retaining band (226, 326, 426) surrounding the first bus bar (214, 314, 414) and the second bus bar (230, 330, 430) having a spring (228, 328, 428) configured to provide a contact force between the contact button (212, 312, 412) and the first bus bar (214, 414) or the second bus bar when the second bus bar (230, 330, 430) is disposed between the parallel first and second layers (236, 238, 336, 338, 436, 438) of the first bus bar (214, 314, 414).