4-Position, 5.08 mm Pitch, Screwless Push-In
The 1776260-4: It uses a screwless leg spring, push-in termination, which means solid or ferruled stranded wire is simply inserted into the clamp without turning a screw. Rated 10 A at 300 V, the block accepts wire from 14 AWG down to 22 AWG. The brass contacts carry a nickel-tin plating, a cost-effective finish for moderate-cycle, low-corrosion environments like control panels, HVAC, and lighting systems. The vertical-with-board mating orientation places the wire entry on the top of the block, perpendicular to the PCB — a common layout for terminal strips along the board edge.
Screwless Termination vs. Screw Clamp
The defining difference between the 1776260-4 and a traditional screw-clamp Buchanan block is the push-in spring termination. No screwdriver is needed for termination — the leg spring holds the wire against the current bar with a consistent force that does not loosen under thermal cycling. This makes it faster to wire in high-volume panel assembly and eliminates the risk of over-torquing or stripping a screw terminal. The trade-off is that the push-in clamp is designed for solid or ferruled stranded wire; bare stranded wire may require a ferrule for reliable insertion, whereas a screw clamp can grip bare stranded conductors directly.
It is a current-catalog Buchanan series part from TE Connectivity, sourced through independent distribution.