McDonnell & Miller 2-M 110100 Switch Els PW 17895 This fixed threshold current switch

This fixed threshold current switch triggers at a low 0

preventing bypass and maintaining precise trim alignment

Built from industrial-grade materials to withstand the rigorous demands of commercial HVAC mechanical rooms

while 2JB-3 is the legacy technical designation used in some older plumbing schematics

preventing motherboards and internal components from overheating

McDonnell & Miller 2-M 110100 Switch Els PW 17895 This fixed threshold current switchThe McDonnell & Miller 2 M (110100) is a heavy duty, SPDT manual reset switch engineered for field installation on Series 47, 247, 51, 51 S, 53, and 63 boiler water feeders. As a low water cut off switch, this component provides critical burner protection by interrupting the circuit if water levels drop below the safe operating line. Designed for versatility in commercial and residential steam systems, the 110100 switch features dual voltage