The 8-1437657-0 is a 4-position 1-row Tri-barrier Strip with tin-plated copper alloy contacts and thermoplastic housing. The 8PCV-04-006 1-level black terminal block has printed circuit pin bottom terminations, zinc-plated steel 8-32 screw and wire clamp combo screw head. The tri-barrier block help contain stray or frayed wire ends. This helps prevent electrical shorts-not only between positions on the same block, but also between other components immediately adjacent to the block. With today's high density PCB designs, this has become an increasingly important feature. Back barriers to safeguard field wiring Fast wiring-backed-out wire-ready screws Interrupted thread designed to prevent screws from falling out Standoffs allow flux and solvents to drain during cleaning Open bottom with standoffs style Direct (all positions filled) mounting style Vertical mounting angle UL94V-0 Flammability rating Applications Industrial, Automation & Process Control, HVAC, Power Management, Security