McDonnell & Miller FS7-4SJ Snap Switch THPU32HP7Y The SPDT/DPST high limit switch

The SPDT/DPST high limit switch configuration allows for precise control of the upper heating element

What is the maximum fluid temperature this valve body can handle

Designed for single-stage Nordyne gas furnaces and packaged units

the NEMA 4 rating indicates the enclosure is designed to protect against splashing water and hose-directed spray

it requires a 10 MFD / 370V capacitor for optimal torque and efficiency during continuous duty cycles

McDonnell & Miller FS7-4SJ Snap Switch THPU32HP7Y The SPDT/DPST high limit switchThe McDonnell & Miller FS7 4SJ (Part Number 120171) is a rugged, industrial grade liquid flow switch designed for high pressure applications where standard brass units fall short. This SPDT snap switch features a durable stainless steel body and wetted parts, allowing it to withstand a maximum pressure of 1000 PSI. Built with a 1 1 4" BSPT connection, it is engineered for precise flow sensing in large pipe systems across hydronic heating, industrial