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McDonnell Miller Series FS4-3T General Purpose In-Line Liquid Flow Switches

General Purpose In-Line Liquid Flow Switches
Series FS4-3T

• For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others
• In-line configuration eliminates need for a pipe tee

• Sizes available
  – ³/₄” NPT
  – 1” NPT
• Paddles available for low, medium or high flow
• Two electrical knock-outs allows connection from either end
• Sensitivity adjusting screw makes flow adjustment easy
• Single pole, double throw snap switch
• Hardened stainless steel bearings minimize friction

Select a link under the "item" tab below to order.

Cat #DescriptionsPart NumberWeight Ibs.(kg)
FS4- 3T1-¾¾” NPT body - high flow rate1148003 ( 1.4)
FS4- 3T2-¾¾” NPT body - medium flow rate1149003 ( 1.4)
FS4- 3T3-¾¾” NPT body - low flow rate1150003 ( 1.4)
FS4- 3T1- 11” NPT body - high flow rate1151003 ( 1.4)
FS4- 3T2- 11” NPT body - medium flow rate1152003 ( 1.4)
FS4- 3T3- 11” NPT body - low flow rate1153003 ( 1.4)
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4 125 VA at 120 or 240 VAC 50 or 60 cycles
240 VAC 3.7 22.2 125 VA at 120 or 240 VAC 50 or 60 cycles


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