The TE Connectivity 1776301-7 is a 2-circuit Eurostyle terminal strip from the Buchanan 503Si series, designed for chassis or panel-mounted power distribution where an integrated fuse saves a separate fuse holder. The 0.394" (10.00mm) pitch gives generous spacing between terminals — enough for 400 V working voltage and 16 A per circuit without tracking concerns. The enclosed barrier type and screw top termination suit permanent installations in industrial control panels, HVAC equipment, and power distribution blocks where field wiring is landed once and left.
Sizing the Wire and the Circuit
The 12-22 AWG wire range covers both the incoming power feed (12 AWG for 16 A continuous) and smaller control or tap circuits (22 AWG). Four wire entries on a 2-circuit strip means each circuit accepts two conductors — useful for daisy-chaining power to adjacent strips or paralleling a feed and a load on the same terminal. The steel screws with non-hexavalent zinc finish provide corrosion resistance in cabinet environments without plating flake contamination.
The Integrated Fuse — What It Changes
The fuse feature is the distinguishing characteristic of this 503Si member. Instead of a plain barrier strip that requires an inline fuse holder or a separate fuse block, the 1776301-7 incorporates the fuse carrier into the terminal body. This saves panel space and reduces wiring points — one less splice or terminal in the circuit. The fuse itself is not included; the buyer sources the appropriate cartridge fuse for their overcurrent protection requirement.