Proflow's battery disconnect switches are designed to isolate the battery circuit and provide anti-theft and fire protection. The PFEBT-107 is a 6 pole master battery cut off / isolator switch isolates engine and protects alternator circuit against heavy voltage surge and prevents engine 'run-on' from the alternator by killing ignition / ecu. Controls circuits up to 500 amps initial load with 100 amps continuous load 12 - 24v.