Wieland 3-pin female black connector 93.831.3353.0

The Wieland 93.831.3353.0 is a 3-pin female connector with a black housing, designed for use in boiler and burner control circuits. It features a cable entry and convenient cable strain relief, with a rated current of 16 A and insulation voltage rating of 250 V. The housing is made of self-extinguishing, halogen-free polyamide, and contacts are silver-plated. It has a protection rating of IP20, surge withstand of 4 kV, and complies with VDE, UL, and CSA standards. The type designation is ST18/3B ZE SW FL.

When selecting a replacement connector of this type, ensure the series, pin count, pitch, and keying match the existing counterpart. Verify the allowable conductor cross-section, insulation temperature class, and terminal type (screw, spring, or crimp). Physical inspection of the connector's keying and pin layout is necessary before ordering, as electrical function does not determine compatibility.

Poor contact in connectors of this kind can cause intermittent lockouts, flame signal loss, or erratic modulation in burner controls. These symptoms may mimic other electrical faults, so connectors are often a first suspect during troubleshooting. Check for loose connections, corrosion, or damaged pins.