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Factory Automation

FAQ

Factory Automation

FAQAbout Products

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  • No : 23289
  • Release Date : 2018/09/12 15:11
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About Low-voltage Power Distribution Products

Why do DU-N* and DUD-N* type have polarity in a main circuitterminal?
Category : 

Answer

In the case of DC, since the load current breaking is more difficultcompared to AC, permanent magnet is provided at each main contactpoint and the arc is driven to side of arc-extinguishing chamber andenhances breaking performance.Since the driving direction is determined by the direction of the magneticflux of the permanent magnet and the direction of the arc (current), it isnecessary to determine the polarity of the main circuit according to thepolarity of the permanent magnet.
Product Name
Motor Starters
Series
MS-T/N

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