Question

Can the contactors/starters be used for DC motors?

Answer

No.

All of our starters and contactors have IEC AC utilization ratings of

1. AC-1 (non-inductive or slightly inductive loads)
   
2. AC-3 (inductive loads like induction motors), but no DC ratings.

Under IEC 60947-2, -3, -4, and 5, The Categories for DC rated low voltage switchgear and control gear are clearly defined.

The reasons for not using an AC rated contactor in a DC system:

1. Not specified by the manufacturer.
   
2. The device does not monitor the DC voltage the same way.
   
3. The make or break ratings are different in DC applications.
   
4. No arc suppression.

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FAQ Subcategory: None

This item was last updated on 2021-02-17
Document ID: 924

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