What it is and where it sits in the VL series
The Molex B04P-VL is a 4-circuit, 2-row shrouded male header in the VL series — a board-to-cable power connector family built around a 0.244 in (6.20 mm) pitch and a 20 A per-contact rating at 600 V. The four-wall shroud encloses the contact array on all sides, so the mating face is protected against accidental shorting during handling and in-field service. The latch-holder fastening adds a positive retention step beyond what a friction-fit header provides, which matters for any harness that sees vibration or repeated mate/de-mate cycles.
What the ratings mean for your board and harness
Contact material is copper alloy with tin plating on both the mating face and the solder tail. Tin finish suits permanent installations where high mating-cycle life is not the primary concern — if the design requires repeated field reconnects, the plating grade is the limiting factor, not the 20 A headline. The PA66 nylon housing carries a UL94 V-0 flammability rating, which satisfies the material requirement in most industrial equipment enclosures. Through-hole solder termination with a 0.142 in (3.60 mm) post length requires adequate pad size and hole tolerance on the PCB. The mated stacking height of 29.2 mm and insulation height of 0.646 in (16.40 mm) should be verified against the board-to-panel z-height budget — the shroud adds vertical clearance that routing or adjacent components must clear. Row spacing is 0.326 in (8.28 mm), which governs the channel-to-channel spacing on the board footprint. Operating temperature range is -25°C to 90°C — adequate for enclosed equipment but narrower than the extended ranges found in industrial-grade signal headers. Confirm the local ambient at the connector location does not approach 90°C, especially if the 20 A rating is drawn continuously, since the housing material's thermal limit constrains the current path more than the contact metallurgy alone.
How it compares to its series siblings
The VL series scales in position count while keeping pitch, voltage, current, and stacking height constant across the family. The B02P-VL (2 positions, 1 row) and B03P-VL (3 positions, 1 row) are single-row variants; the B04P-VL is the first 2-row member. The B08P-VL (8 positions, 2 rows) shares the same 6.20 mm pitch, 600 V, 20 A, and 29.2 mm stacking height — mechanically a drop-in alternative if the panel footprint and pinout are compatible. All four carry the same tin-plated contacts, latch-holder fastening, and PA66 V-0 housing. The decision between them is purely a function of circuit count: match the position count to the BOM line and the connector series takes care of the rest.