Contact Blocks Faston fitting Approvals UL; CSA Schneider Electric ZB6 Harmony 16mm A range of IP65 protected components which are easily and quickly mounted in 16mm diameter holes. Each component can be ordered separately to build the required device. Also available are contact blocks with slow-break positive opening contacts with ’Faston’/solder connections. Rating U e 250Vac, Ie 1.5A; Ue 250Vdc, Ie 0.1A, Io A I th operating temp. -25 to +70°C.