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FSU Flow Detection Switches

Cynergy3 / Sensata FSU Flow Detection Switches offer a 25V maximum switching power rating, 0.6A switching current, and 240V_AC switching voltage. These switches feature a design that is based around a moving magnet and a fixed reed switch with a low flow restriction. FSU switches have industry-standard process connection sizes (push-fit or NPT thread) that provide a quick and reliable method of installation. Cynergy3 / Sensata FSU Flow Detection Switches are ideal for industrial washers and garment cleaners.

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Select	Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.	RoHS	ECAD Model	Type	Range	Operating Supply Voltage	Port Size	Housing Material
	Flow Sensors FLOW SENSOR FSU34LF Cynergy3 1: $38.31 1In Stock 10Expected 11/17/2026	Mfr. Part # FSU34LF Mouser Part # 285-FSU34LF	Cynergy3	Flow Sensors FLOW SENSOR Learn More about Cynergy3 fsu flow detection switches	Datasheet	1In Stock 10Expected 11/17/2026	$38.31 $36.47 $34.80 $33.78	Min.: 1 Mult.: 1			Flow Detection Switches	1.75 L/min	240 VAC, 120 VDC	3/4 in NPT	Polyoxymethylene (POM)
	Flow Sensors Fluid flow switch 3/4" tube connection standard flow FSU75A Cynergy3 1: $35.86 2In Stock	Mfr. Part # FSU75A Mouser Part # 285-FSU75A	Cynergy3	Flow Sensors Fluid flow switch 3/4" tube connection standard flow Learn More about Cynergy3 fsu flow detection switches	Datasheet	2In Stock	$35.86 $34.14 $32.60 $31.63	Min.: 1 Mult.: 1			Flow Detection Switches	3.75 L/min	240 VAC, 120 VDC	3/4 in Tube	Polyoxymethylene (POM)
	Flow Sensors FLOW SENSOR FSU75LF Cynergy3 1: $38.31 3In Stock	Mfr. Part # FSU75LF Mouser Part # 285-FSU75LF	Cynergy3	Flow Sensors FLOW SENSOR Learn More about Cynergy3 fsu flow detection switches	Datasheet	3In Stock	$38.31 $36.47 $34.80 $33.78	Min.: 1 Mult.: 1			Flow Detection Switches	1.75 L/min	240 VAC, 120 VDC	3/4 in Tube	Polyoxymethylene (POM)
	Flow Sensors FLOW SENSOR FSU12LF Cynergy3 1: $37.06 26In Stock 35Expected 10/19/2026	Mfr. Part # FSU12LF Mouser Part # 285-FSU12LF	Cynergy3	Flow Sensors FLOW SENSOR Learn More about Cynergy3 fsu flow detection switches	Datasheet	26In Stock 35Expected 10/19/2026	$37.06 $35.27 $33.69 $32.71	Min.: 1 Mult.: 1			Flow Detection Switches	0.9 L/min	240 VAC, 120 VDC	12 in NPT	Polyoxymethylene (POM)
	Flow Sensors FSU12A FSU12A Cynergy3 1: $34.64 90On Order	Mfr. Part # FSU12A Mouser Part # 285-FSU12A	Cynergy3	Flow Sensors FSU12A Learn More about Cynergy3 fsu flow detection switches	Datasheet	90On Order On Order Ship Dates Mfr. #: FSU12A Stock: 0 On Order: 20 Expected 10/20/2026 30 Expected 10/23/2026 40 Expected 11/23/2026 Factory Lead-Time: 13 Weeks	$34.64 $32.99 $31.51 $30.56	Min.: 1 Mult.: 1			Flow Detection Switches	2 L/min	240 VAC, 120 VDC	12 in NPT	Polyoxymethylene (POM)
	Flow Sensors FLOW SENSOR FSU34A Cynergy3 1: $35.86 16Expected 12/1/2026	Mfr. Part # FSU34A Mouser Part # 285-FSU34A	Cynergy3	Flow Sensors FLOW SENSOR Learn More about Cynergy3 fsu flow detection switches	Datasheet	16Expected 12/1/2026	$35.86 $34.14 $32.60 $31.63	Min.: 1 Mult.: 1			Flow Detection Switches	3.75 L/min	240 VAC, 120 VDC	3/4 in NPT	Polyoxymethylene (POM)
	Flow Sensors Fluid flow switch 1/2" tube connection standard flow FSU50A Cynergy3 1: $34.64 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # FSU50A Mouser Part # 285-FSU50A	Cynergy3	Flow Sensors Fluid flow switch 1/2" tube connection standard flow Learn More about Cynergy3 fsu flow detection switches	Datasheet	Non-Stocked Lead-Time 10 Weeks	$34.64 $32.99 $31.51 $30.56	Min.: 1 Mult.: 1			Flow Detection Switches	2 L/min	240 VAC, 120 VDC	1/2 in Tube	Polyoxymethylene (POM)
	Flow Sensors FLOW SENSOR FSU50LF Cynergy3 1: $37.06 Non-Stocked Lead-Time 10 Weeks	Mfr. Part # FSU50LF Mouser Part # 285-FSU50LF	Cynergy3	Flow Sensors FLOW SENSOR Learn More about Cynergy3 fsu flow detection switches	Datasheet	Non-Stocked Lead-Time 10 Weeks	$37.06 $35.27 $33.69 $32.71	Min.: 1 Mult.: 1			Flow Detection Switches	0.9 L/min	240 VAC, 120 VDC	1/2 in Tube	Polyoxymethylene (POM)