To maintain a proper wall thickness, 500MCM contacts require a larger cable side end than our standard contacts. The larger contacts fit in the standard insulators and have no limitations with regard to compatibility. They are made with the same silver plated solid copper construction and are fixed in the insulators in the same manner as the standard contacts.
 
TJB 530MCM contacts fit the standard insulators and have no limitations regarding compatibility.  The larger contacts are made with the same silver plated solid copper construction and are fixed in the insulators in the same manner as the standard contacts.