McDonnell & Miller 354089 Switch Assembly 320788-702 this unit provides long-term field

this unit provides long-term field serviceability without necessitating a full valve replacement

classified as an L210-40F limit switch

Technicians frequently use this model as a direct replacement in systems requiring precise flame rectification

High-Durability Leads: 78-inch lead length provides ample slack for clean wiring within the electrical cabinet

or visible cracks in the ceramic insulators

McDonnell & Miller 354089 Switch Assembly 320788-702 this unit provides long-term fieldThe McDonnell & Miller 354089 Switch Assembly, also designated as the Model SWA 150S M, is a critical replacement component engineered specifically for Series 150S and 157S low water cut offs and pump controllers. For technicians servicing steam boilers, this snap action switch assembly is the standard for maintaining precise liquid level control and ensuring high limit safety. Featuring a manual reset mechanism, this assembly requires professional