WirthCo 20387 Battery Doctor Mini Master Rotary Dial Disconnect Switch with On/Off Knob and Bottom Cover Designed for applications up to 48 Volts DC Can be used with 1 or 2 batteries Disconnect switch is ISO 8846 approved Has a continuous rating of 300 amperes, intermittent rating of 1000 amperes/5 seconds and crank rating of 700 amperes/10 seconds Knob operated on/off configuration and a bottom cover