What size circuit breaker is needed for a 60KW device?

For a 60KW device, it is recommended to use160Aan air switch. This choice is based on the power of the device and the load current of the air switch. The specific calculation process is as follows:

First, we need to determine the current of the device. The current I can be calculated using the formula I=P/(1.732Ucosφ), where P is the power (60KW), U is the voltage (usually the standard three-phase mains voltage), and cosφ is the load power factor (for motors, it is generally taken as 0.75). Using this formula, we can calculate the current of the device.

Then, we need to consider the rated current of the air switch. The rated current of the air switch should be selected at about 1.5 times the load current to ensure that the air switch can operate stably under normal working conditions and can disconnect in a timely manner during current overload, protecting the safety of the circuit and equipment.

Therefore, based on the current calculation results of the 60KW device and the selection principle of the rated current of the air switch, we recommend using a 160A air switch. This can meet the normal operating requirements of the device while providing effective overload protection when necessary.

It is important to note that when selecting an air switch, other factors such as the number of poles, type, and operating environment should also be considered to ensure it is suitable for specific circuits and equipment. Additionally, when installing and maintaining the air switch, relevant safety regulations and operating specifications should be followed to ensure personnel safety and stable operation of the equipment.

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