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do we need a secondary crusher in namibia

Definition of secondary crusher Can someone please explain me why do we need full relay module with lots of other elements because what i read makes me think a relay is complete in itself and has seperate connection for 5v DC and 220v AC we use aurdino or rpi to supply it 5v power and to activate or deactivate it ...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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