What points can I refer to when purchasing a soft starter

When purchasing a soft starter, you can refer to the following points to ensure that you choose the right product:

Rated power and current of the motor

Select the specifications of the soft starter according to the actual power (kW) and rated current of the motor. The capacity of the soft starter should match the actual power and rated current of the motor, leaving a slight margin to avoid overloading the soft starter.

Voltage level

Confirm the operating voltage of the motor, such as 380V, 660V or high voltage (such as 6kV, 10kV), and select a soft starter that matches the system voltage.

Load type

Different load types require different starting characteristics, for example:

Light loads (such as centrifugal pumps, fans): require smooth soft start and reduce water hammer effect.

Heavy loads (such as crushers, mixers): require a larger starting torque, and the soft starter should have higher impact resistance.

Number of starts and working environment

When the starting frequency is high, a high-performance soft starter with good heat dissipation should be selected.

The use environment of the soft starter should consider temperature, humidity, dust, corrosiveness, etc. If necessary, select equipment with a higher protection level (such as IP54/IP65).

Functional requirements

When selecting a soft starter, it is necessary to clarify the required functions, such as:

Current limiting function: protect the motor and the power grid during the startup process.

Protection function: overload protection, undervoltage/overvoltage protection, overheating protection, etc.

Communication function: support Modbus, Profibus, CAN and other communication protocols, easy to integrate into the automation system.

Bypass contactor interface: reduce the energy consumption of the soft starter during operation.

Installation method and size

The physical size and installation method (guide rail installation, cabinet installation) of the soft starter should meet the requirements of the actual installation space to ensure easy integration in the existing system.