Panel-Mount Barrier Block for Field Wiring
The TE Connectivity Buchanan 1546307-4 is a 4-circuit barrier strip terminal block built for chassis or panel mounting. It uses a dual-wall barrier design with 2 rows, giving you 8 wire entries total — two per circuit — for daisy-chaining or commoning a feed through the block. The 0.375" (9.53mm) pitch keeps the screw terminals spaced wide enough for a standard screwdriver without crowding adjacent wires. Rated 20A at 300V, this block handles motor control, lighting panel, and power distribution wiring inside an industrial enclosure. The bottom is closed, meaning no through-hole PCB connection; all wiring lands on the screw terminals from above.
Wire Range and Termination Hardware
The screw terminals accept 12-22 AWG wire — solid or stranded — with a nickel-plated steel screw. The captive plate under each screw head distributes clamping force across the conductor, reducing cold flow compared to a bare screw point. The nickel finish on the screw resists corrosion in humid panel environments. Each of the 4 circuits gives you two wire entries (8 total), letting you land an incoming and outgoing wire on the same barrier position. That's useful for looping power through a block to downstream loads without a separate jumper.
Mounting and Enclosure Fit
The block includes a flange on each end for screw-mounting to a chassis or panel. The 2-wall (dual) barrier design puts a physical wall between adjacent terminals, reducing the chance of a stray strand bridging circuits during wiring. The closed bottom means no exposed solder tails underneath — the block sits flush against the mounting surface.