SMD termination and board layout fit
The 3-647166-4: Surface-mount solder tails eliminate the need for through-hole soldering — the header sits flush on the PCB, saving board space on the secondary side. The 0.290" (7.37 mm) mating pin length provides sufficient engagement depth for standard MTA-100 receptacles; the 0.347" (8.81 mm) insulation height leaves clearance for wire strain reliefs above the housing. Rated 250 VAC; current varies by wire gauge and is limited by the pin cross-section, not the housing.
Cross-shop alternatives in the same pitch family
Peer 1379030-3 offers 12 positions in a 2-row, 0.100" pitch configuration with board lock and mounting flange — suited for higher-density board-to-wire connections where the single-row 3-647166-4 does not fit.