The MOLEX 43650-0421 is a Micro-Fit 3.0 vertical header, part of the 43650 series, designed for robust power and wire-to-board connections. This header features a 3.00mm pitch, a single-row layout, and accommodates 4 circuits. It incorporates a PCB press-fit metal retention clip for secure mounting and is constructed with high-temperature thermoplastic resin and brass material with tin plating. The header is glow-wire capable, meeting IEC 60335-1 safety standards, and is RoHS compliant, ensuring environmental responsibility. It is suitable for applications requiring reliable power transmission and is commonly used in various electronic devices and appliances.