Classification by position of bypass contactor
External bypass soft starter: The bypass contactor is independent of the soft starter and triggers the coil action of the external bypass contactor through the external bypass touchpoint of the soft starter to realize the switching of the main circuit. This type of soft starter was more common in the early days and is suitable for some occasions that do not require high space and require flexible configuration of bypass contactors, but the external wiring is relatively complicated.
Built-in bypass soft starter: The bypass contactor is installed inside the soft starter. After the start is completed, the soft starter directly triggers the built-in bypass contactor to pull in through the internal signal, and at the same time turns off the thyristor without external control. This simplifies the wiring of the external main circuit and saves installation space. It has now become the mainstream product in the market.
Classified by application voltage level: It can be divided into low-voltage bypass soft starter and high-voltage bypass soft starter. Low-voltage bypass soft starter is generally suitable for motors with a rated voltage below 1kV, and the common voltage levels are 220V, 380V, 400V, 660V, etc.; high-voltage bypass soft starter is used for high-voltage motors with a rated voltage of 1kV and above, such as 3kV, 6kV, 10kV and other voltage levels. Its technical difficulty and cost are relatively high, and it is usually used in large industrial equipment and power systems.
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