and 848577

For most oil-fired heating appliances

Enhanced Thermal Management: Precise DPST (Double Pole Single Throw) switching ensures heating elements energize and de-energize in the correct order

The alloyed metal construction and corrosion-resistant finish prevent premature failure caused by technical stress and environmental exposure

it maintains pin-for-pin compatibility

McDonnell & Miller 157S-A Controller Els PW 17895 and 848577The McDonnell & Miller 157S A (Part Number 173702) is a heavy duty combination low water cut off and pump controller designed specifically for commercial and industrial steam boiler applications. Featuring a snap acting SPDT switch, this unit ensures precise control over water levels and reliable burner cutout during low water conditions. The 157S A model includes alternate tappings, providing versatile installation options for equalizing pipes and