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The reasonable structure design of moving and fixed contacts makes the short circuit peak value and energy of this series of products I²t much smaller than expected.
The current flows in from the fixed contact 1, flows out from the fixed contact 2, through the moving, fixed silver contact and the moving contact. The moving contact quickly disconnects under the action of strong electric repulsion force (Holm force and Lorentz force) to improve the breaking speed.
When the short circuit large current occur in the circuit, the gas producing parts will generate other gas under the high temperature of the arc, the air pressure in the contact unit box increases rapidly, and a high-speed air flow can be formed through the air outlet of the arc extinguishing chamber, which can effectively extinguish the arc.
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Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
Risus commodo viverra maecenas accumsan lacus vel facilisis.
The optimized structural design of the moving and fixed contacts significantly reduces the short circuit peak value and the energy (I²t) of this MCCB series, keeping them much lower than expected.
Current enters through fixed contact 1 and exits through fixed contact 2, passing through the moving contact and the fixed silver contacts during normal operation.
Under short circuit conditions, strong electromagnetic repulsion forces—specifically Holm force and Lorentz force—act on the moving contact to disconnect it rapidly, improving the overall breaking speed.
The air blowing design is engineered to quickly and effectively extinguish the electrical arc generated during a high-current short circuit event.
The high temperature of the arc causes specialized parts to generate gas, rapidly increasing air pressure inside the contact unit box. This creates a high-speed air flow through the arc extinguishing chamber's outlet to extinguish the arc.
These strong electromagnetic repulsion forces act on the moving contact during a short circuit, causing it to disconnect quickly, which significantly improves the overall breaking speed.
