The Schneider Electric GS1AU203 is a TeSys-series shorting link — a connection accessory used to bridge power terminals on IEC disconnect switches or contactors within a panel. It's rated for 60 A switched current and ships as a set of three units.
What the 60 A rating means for fit
The 60 A switch rated current tells you the link can carry that load continuously through the disconnect or contactor it bridges. In a panel, that typically matches a 60 A frame disconnect — any higher and the link becomes the thermal bottleneck. The set-of-three format covers all three phases in a single order line.