These connectors should not be mated or unmated under electrical load. Connectors of the same or different types arranged in a line should be polarised to prevent the possibility of wrong connection. UL, CSA, SEV. Two 16P + E inserts may be accommodated within a ‘Size ‘ 32A housing (typical stock no ; 363-7964 363-7964 ). Han A® Inserts. Harting contact inserts have a wide range of uses. Inserts are selected according to the desired number of poles and voltage and current ratings. Slim construction Poles: 3-16 (screw connection)