Lumberg 3-pin connector 24310.45025

This is a 3-pin connector from the RAST 5 series, intended for electrical connections in fans. It has a right-angle or horizontal mounting body made of plastic. The contacts are copper alloy with tin plating. It is rated for 10 A at 250 V and operates from -40 °C. Connection is via screw clamp. Equivalent parts are Lumberg 3623 03 K01 and Cohamo YY-A5002-H03-K01.

Parts of this type are selected by matching the number of pins, the wire cross-section accepted, and the ingress protection. The mounting form may be right-angle or horizontal, so verify which fits the equipment. Compare the electrical rating and ambient temperature range with the fan's specifications. Also check the housing shape, orientation, locking mechanism, and terminal arrangement against the original connector.

When connectors of this kind fail, they often cause intermittent contact, signal loss, or speed-feedback errors, which the boiler may report as an airflow fault. A loose connection can prevent the burner from firing. Check the connector for signs of overheating, corrosion, or damaged terminals, and ensure it is fully seated and locked.