When used with Non-Unitized Alternators, these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running
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![Perko Medium Duty Battery Disconnect Shut Off/On - 250 Amp Continuous, 12-32VDC [9601DP]](http://www.essentialmarineservices.com/cdn/shop/files/42029XL.jpg?v=1702350499&width=1445)