Trolley brackets for mounting the main trolley lines with a voltage of 660V AC (50Hz), feeding bridge cranes. To reinforced concrete crane beams are fastened with studs K38BU1, to metal ones – with bolts.

The permissible heating temperature of the brackets is 65° C and 100° C. The permissible load on the trolley holder is 3.15 kN (for K33B, K33BS), for the rest 0.8 kN. The frames of the brackets are made of steel with a paint coating.