... price 2013 factory manufacture Explosion Proof Corrosion Proof Control Unit Application: 1, Designed for Zone 1 ... pushbutton, conversion switch ,ammeter ,voltmeter ,potentiometer etc. and other components can be as per request.4,Built-in explosion proof control switch ... Ingress protection:IP658,Corrosion resistance:WF29,Product form: Control unit Electrical hoist button:Ingress thread specification : G3 ...