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A fan speed control wall switch is a specialized switching device used to change the speed of a fan. It is installed on the wall and adjusts the fan's power supply voltage, phase, or frequency to regulate the fan speed, thereby controlling the fan's rotation speed and allowing users to obtain different levels of airflow.

From the perspective of product design, electrical parameters, and load matching, the common operating power range of fan speed control wall switches is typically: Minimum power approximately 75W Maximum power approximately 500W

Based on industry standards and electrical wiring experience, in a 220V power system: • 2.5mm² copper wire: commonly used with a maximum capacity of 16A • 4mm² copper wire: can carry 20A~25A • 6mm² copper wire: commonly used for high-power equipment around 32A Therefore, the most suitable wire for a 20A DP wall switch is: ✅ 4mm² copper core wire (BV 4mm² or RV 4mm²)

Assuming a rated voltage of 250V and a current of 20A, the maximum theoretical power is: 20A × 250V = 5000W This means that a 20A DP Wall Switch can theoretically withstand a maximum load of 5000W.

20A DP wall switches are primarily used for: • High-power electric heating equipment (water heaters, space heaters, etc.) • High-load kitchen equipment (ovens, induction cookers, etc.) • High-power bathroom equipment • Appliances requiring double-pole isolation • Large, fixed-installation appliances

A 20A DP wall switch generally contains two independent switching units: • The first pole disconnects the live wire (Live). • The second pole disconnects the neutral wire (Neutral). Both poles operate simultaneously, meaning they disconnect or connect simultaneously. The internal structure can be summarized as: Live wire: L IN → L OUT Neutral wire: N IN → N OUT