The LM300 Series Level Maintainer automatically adds oil to the crankcase as needed to keep the lube level normal. Most models have built-in switches that will alarm and/or shutdown the equipment if the makeup supply is depleted and engine oil level falls or if overfill conditions exist. LM300 series explosion-proof models are CSA certified for Class I, Division 1 Hazardous areas. The LM302 has two switches for low and high level shutdown or alarm. Four wires, DPST, wired N.O. in normal operating ranges.