For the SK Series, we analyzed arc behavior by doing actual verification and simulations, and based on the results, we only thickened the part of the partition wall that is subject to wear. In addition, we adopted a groove shape for stagnating the arc gas in order to improve cooling efficiency for the arc during cutoff, while also successfully reducing the width of the product from 53mm to 45mm.
The newly developed polarized DC electromagnet optimizes the quantity of magnetic flux for the permanent magnet as well as the magnetic flux of the coil so that the plunger can operate after the coil voltage rises sufficiently. We were able to reduce the depth from 108mm to 94mm, while also greatly reducing power consumption from 7W to 2.4W.
External appearance of SK18, 22
Internal structure of the contact
Optimization of interphase partition wall and arc gas stagnation structure
Newly developed direct current electromagnet