Potter VSR-FEX (8”)


Explosion Proof Vane Type Waterflow Switch with Retard

Availability: Please Call for Lead Time

  • Factory New
Brand: Potter FireAlarm.com Part #: 4581 Categories: , Manufacturer Part #: VSR-FEX (8”)Secondary Part #: 1113208 Tag:


The Model VSR-FEX is a vane type waterflow switch for use on wet sprinkler systems located in hazardous locations as shown above. The unit may also be used as a sectional waterflow detector on large systems.

The unit contains two single pole, double throw, snap action switches and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a flow of 10 gallons per minute (38 Lpm) or more occurs downstream of the device. The flow condition must exist for a period of time necessary to overcome the selected retard period.


Weight 6.00 lbs
Dimensions 4.10 × 6.52 × 8.52 in

Contact Configuration

Material Qualities



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  • NEMA 4/IP66 solid metal enclosure
  • 0-90 second field replaceable retard
  • Non-corrosive saddle bushing
  • (2) 1⁄2” threaded conduit connections
  • Assembled in USA


VSR-FEX; Explosion Proof Vane Type Waterflow Alarm Switch with Retard
Potter – Data Sheet
Frozen Devices
Potter – Technical Bulletin