York S1-KTKR15 Fuse 318820-201 this switch ensures the combustion

this switch ensures the combustion air pressure and venting conditions meet precise operational parameters before allowing the ignition sequence to proceed

or unit heaters

the NEMA 4X rating indicates the housing is designed to protect electrical components from windblown dust

For high-capacity pressure protection in commercial and industrial hydronic systems

or excessive soot in the flue

York S1-KTKR15 Fuse 318820-201 this switch ensures the combustionThe York S1 KTKR15 Fuse is a critical Class CC overcurrent protection component utilized extensively in HVAC control circuits and motor branch circuits. This is a fast acting, 15 amp, 600V cartridge fuse designed for high performance current limitation. Built to rejection style standards, it features a physical midget size melamine body 13 32" in diameter by 1 1 2" long, which prevents the accidental installation of lower voltage or non rejection