Barrier Block Overview
The Molex Beau 387212816 is a 16-circuit barrier block from the Beau 38721 series, designed for chassis or panel-mount applications where a secure, screw-terminated power distribution point is needed. It uses a 0.375" (9.53 mm) pitch between terminals, giving each circuit enough spacing to handle the 15 A current rating at 300 V without crowding the wiring. The dual-wall barrier construction isolates adjacent terminals, and the flange on each end provides a solid mounting point for the screws that hold it to the panel. Top termination is via screws — the wire is clamped under a screw head, a common field-serviceable method. Bottom termination is wire wrap, meaning the connection on the underside is made by wrapping stripped wire around a square post, a gas-tight connection often used in high-reliability or high-vibration environments. The block accepts 14-22 AWG wire, covering a wide range of power and signal wiring.
Circuit Count and Sibling Comparison
The 16 circuits of the 387212816 make it the high-position-count member of the Beau 38721 flange-mount family. For comparison, the 387216706 carries 6 circuits, the 387216704 carries 4 circuits, and the 387216703 carries 3 circuits — all at the same 0.375" pitch and 15 A rating. The choice between them is a straight position-count decision: match the number of circuits to the number of independent conductors that need terminating. The 16-circuit block takes up roughly 6.0" of panel space (16 positions × 0.375" pitch), so confirm the cutout length before committing. A key difference beyond circuit count is the bottom termination style. The 387212816 uses wire wrap, while the 387216706, 387216704, and 387216703 use quick connect (0.187") insulated tabs. If your harness assembly is set up for quick-connect receptacles, the wire-wrap version requires a different termination process — either a wire-wrap tool or soldering the wire to the post. They are not drop-in interchangeable without rewiring the bottom side.
Top termination uses screws with a brass screw and nickel finish. Bottom termination is wire wrap on a square post. The dual-wall barrier isolates adjacent terminals. The flange accepts a mounting screw for panel attachment.