Eurostyle Terminal Strip, 3 Circuits, 10.00 mm Pitch
The TE Connectivity Buchanan 2-1776301-3 is a 3-circuit Eurostyle terminal strip from the 503Si series, built for chassis or panel mounting. It carries a 16 A current rating at 400 V and accepts wire from 12 AWG down to 22 AWG — a power-grade block suited for distribution panels, control cabinets, and industrial equipment where a fused disconnect is needed at the termination point. The 0.394" (10.00 mm) pitch gives generous spacing between circuits for the 400 V working voltage, keeping creepage and clearance comfortable for a 3-circuit block. The enclosed barrier design — a polyamide (PA66) housing — adds physical isolation between terminals, which matters when the strip lives inside an enclosure where accidental tool contact is a risk.
Integral Fuse — What Sets This Block Apart
The fuse feature (listed under Features) is the distinguishing spec on this terminal strip. Most 3-circuit Eurostyle blocks are simple pass-through barriers; this one integrates a fuse holder into the strip, so each circuit can be individually fused without adding an in-line fuse holder or a separate fuse block on the DIN rail. For a panel builder, that means one part number covers both termination and overcurrent protection on a 3-wire circuit — saves a component and a wiring step.
Top termination is screw-clamp, with steel screws finished in zinc with non-hexavalent chromate — standard for industrial terminal blocks where corrosion resistance on the screw matters. The bottom termination is closed (no through-hole), which means the wire enters from the top only and terminates inside the enclosed barrier. Wire range is 12-22 AWG, with 6 wire entries total across the 2 rows (3 circuits × 2 rows). The dual-row layout lets you land two wires per circuit, useful for daisy-chaining or paralleling feeds.
Temperature and Material Limits
Rated for -35°C to 100°C operating temperature — the PA66 insulation handles the upper end without softening, and the lower end is fine for unheated industrial cabinets. The 16 A rating is at the block level; derate above 100°C per the manufacturer's curve, but for most panel applications inside a 40-50°C cabinet, the full 16 A per circuit is usable.