Tri-Bar 4-Bar

US Safety Trolley Tri-Bar/Four-Bar — Replacement Collectors and Contact Shoes

US Safety Trolley discontinued new system orders for Tri-Bar/Four-Bar conductor bar on January 31, 2022. Crane-Controls.com stocks the C70 replacement contact shoe for Tri-Bar/Four-Bar installations currently in service at US crane and industrial facilities.

Tri-Bar/Four-Bar is a joint-free multi-conductor conductor bar system with solid copper conductors housed in a high-impact PVC insulated housing, originally available in 50A, 100A, and 125A configurations in 3-pole (Tri-Bar) and 4-pole (Four-Bar) versions rated up to 600V. The collector assembly rides the conductor bar housing as the crane or trolley travels, maintaining continuous electrical contact between the energized copper conductors and the crane power circuit. Replacement collectors and contact shoes are the primary MRO components required to maintain Tri-Bar/Four-Bar systems in service.

Crane-Controls.com's technical team can assist with identifying correct replacement parts for existing Tri-Bar/Four-Bar installations. New Tri-Bar/Four-Bar system orders are not available — replacement parts only, subject to availability. For new joint-free conductor bar installations, Spanguard components are available through Crane-Controls.com.