This manual reset thermal switch acts as a flame rollout limit

utilizing the monitored conductor to drive the N

75 to 50 A

Industry Compliance: Engineered to meet standard boiler feed valve requirements for residential and commercial heating

McDonnell & Miller FS4-3J Flow Switch 30067439-890 This manual reset thermal switchThe McDonnell & Miller FS4 3J Flow Switch (Part Number 114610) is a heavy duty, general purpose liquid flow switch designed for HVAC and industrial hydronic systems. This model features a 1" BSPT connection, making it a critical component for international piping standards or specific domestic applications requiring British Standard Pipe Threads. Equipped with a Single Pole, Double Throw (SPDT) switch, the FS4 3J provides versatile signaling for