**MCB 3 Phase 20 Ampere: How Many Watts?**

### What is an MCB?

An MCB (Miniature Circuit Breaker) is a device used to protect electrical circuits from overcurrent and short circuits. It is designed to automatically switch off the power supply in case of an abnormal condition, preventing damage to the circuit and ensuring safety.

### 3 Phase MCB 20 Ampere

A 3 phase MCB 20 ampere is a type of MCB that is designed to handle a maximum current of 20 amperes per phase in a 3-phase electrical circuit. This means that the total current capacity of the MCB is 20 amperes x 3 phases = 60 amperes.

### Calculating the Wattage

To calculate the wattage of an MCB, we need to know the voltage and current rating of the device. For a 3 phase MCB 20 ampere, let's assume a voltage rating of 415 volts (which is a common voltage rating for 3-phase systems).

**Formula:**

Wattage (W) = Voltage (V) x Current (I) x Power Factor (PF)

For a 3-phase system, the power factor is typically around 0.8-0.9. Let's assume a power factor of 0.85.

**Calculation:**

Wattage (W) = 415V x 20A x 0.85 x √3 (for 3-phase system) Wattage (W) = 21,420 Watts

Therefore, a 3 phase MCB 20 ampere is capable of handling a maximum power of approximately **21,420 Watts**.

### Conclusion

In conclusion, a 3 phase MCB 20 ampere has a maximum power capacity of around 21,420 Watts, making it suitable for applications that require a high power rating. It is essential to choose the correct MCB rating for your electrical circuit to ensure safety and prevent damage to the system.