McDonnell & Miller 61-HD Low Water Cut Off R-410A OEM Standards: Genuine Armstrong replacement

OEM Standards: Genuine Armstrong replacement part ensuring exact fitment and terminal alignment for quick field installation

if the fuse blows

the non-conductive sub-base and cover assembly mount directly to a standard 2" x 4" vertical junction box

or corrosion to prevent system failure

McDonnell & Miller 61-HD Low Water Cut Off R-410A OEM Standards: Genuine Armstrong replacementThe McDonnell & Miller 61 HD (Part Number 140300) is a heavy duty mechanical low water cut off designed specifically for low pressure steam boiler applications. This head mechanism serves as a direct replacement component for Series 61 controllers, facilitating reliable burner circuit interruption when water levels drop below the safe line. Rated for a maximum steam pressure of 20 PSI, the 61 HD utilizes a high buoyancy float operated mechanism to