McDonnell & Miller 63-B Low Water Cut Off 318973-401 it operates as a normally

it operates as a normally open contact that closes on temperature rise

Set at a precise 15 PSI pressure relief

The assembly includes a pre-installed hi-limit switch (calibrated to open at 160°F and close at 140°F) and a precision-cut mounting gasket

providing a linear 4-20 mA output signal that ensures reliable data transmission even over long distances

McDonnell & Miller 63-B Low Water Cut Off 318973-401 it operates as a normallyThe McDonnell & Miller 63 B (Part Number 142700) is a heavy duty, float operated mechanical low water cut off engineered for reliable performance in residential and commercial hot water and steam boilers. As a veteran grade boiler safety control, this unit features an automatic reset and a 1" NPT threaded connection, rated for a maximum pressure of 50 PSI. The integrated float block design ensures stable operation by reducing float movement caused by