The TE Connectivity Buchanan 1546306-3 is a 3-circuit, dual-row barrier terminal block on a 0.374" (9.50mm) pitch. It is a panel-mount screw-clamp block with closed-bottom construction, meaning the screw terminals are accessed from the top and the wire entries are enclosed on the bottom side. This is the kind of block you spec for a control cabinet junction point or a power distribution terminal rail where you need a field-serviceable, vibration-resistant connection that doesn't require a PCB. The dual-wall barrier between each circuit provides physical isolation that prevents accidental shorting between adjacent terminals when you're landing 12 AWG power feeds.
Rated 20A per circuit at 300V, this block handles the typical 24 VDC control power bus or a 120 VAC lighting circuit without derating concern at room temperature. The 0.374" (9.50mm) pitch is wide enough that you can land 12 AWG stranded wire with a standard screwdriver without crowding the adjacent terminal — the 2 Wall (Dual) barrier keeps the conductor contained. The 12-22 AWG wire range means you can mix a 12 AWG power feed on one circuit and 18 AWG sensor wiring on the next.
Mounts to a chassis or panel via the integral flange — the flange provides a positive mechanical anchor that keeps the block from shifting when you torque the screw terminals. The top termination uses steel screws with a nickel finish; the closed bottom means the screw threads are captive and the wire is clamped against a current-carrying bar. With 6 wire entries across 3 circuits (2 wires per circuit), you can daisy-chain power through the block by landing an incoming and outgoing wire under the same screw. The black housing is the standard industrial color for this series.