Pitch and Wire Gauge — the Two Numbers That Decide Fit
The JST 04ZR-3H-P is a 4-position receptacle from the ZR series, terminated via IDC to discrete 30 AWG wire. The closed-end housing prevents over-insertion past the last cavity, a detail that saves a rework step on a harness board. Tin contacts are specified on the female socket. The housing is natural (uncolored) and ships in bulk packaging. Mounting is free-hanging (in-line) — no board lock or panel feature — so the connector floats in the harness and relies on the IDC termination for strain relief.
