Hella Switch Battery Master 500A Ip65At HELLA we offer you a wide range of different switches for every function. HELLA's battery disconnectors provide effective safety against theft and fire hazards in the event of accidents in the agricultural and construction machinery industry, for example. Simply pressing the key forcibly closes the vehicle's circuit between the battery, starter and other consumers. Opening (separation) is effected by a return spring. An indispensable safety factor.