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"DP" is an abbreviation for Double Pole, commonly referred to in Chinese as: Double-pole wall switch This means: • When the wall switch operates, • it disconnects both wires simultaneously • typically the live wire and the neutral wire This is the fundamental difference between a DP wall switch and a regular single-pole (SP) wall switch.

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