This is a brand name requirement for LineBacker Retro Fit/Upgrade Kit for Siemens Interrupter, this is a brand name requirement through Southern States. NO PHONE CALLS REGARDING THIS REQUIREMENT WILL ... This is a brand name requirement for LineBacker Retro Fit/Upgrade Kit for Siemens Interrupter, this is a brand name requirement through Southern States. NO PHONE CALLS REGARDING THIS REQUIREMENT WILL BE ACCEPTED. QUESTIONS MAY BE SENT TO THE CONTRACTING OFFICER VIA EMAIL AT HAMMANS@WAPA.GOV