The 2-1734839-4: It uses a zero insertion force (ZIF) mechanism with a slide lock — you open the actuator, slide in the FPC, then close it to clamp the contacts without stressing the flex. The UL94 V-0 thermoplastic housing and gold flash on phosphor bronze contacts give it a solid baseline for repeated mating cycles — gold flash is thin but sufficient for occasional reconnects in a field-service scenario.
Board-fit details for the layout engineer
The connector sits 0.081" (2.05mm) above the board, so it clears low-profile components underneath. The FPC thickness spec is 0.30mm; a thicker flex won't seat fully in the ZIF slot, so verify your cable stack-up. Contact finish is gold flash over phosphor bronze base.