Vesda VSR-3.5
Vesda VSR-3.5
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The VSR-3.5 is a highly dependable vane-type waterflow switch designed for use on wet sprinkler systems. Engineered for accuracy and long-term performance, it is certified by UL, cUL, CSFM, and FM, with the VSR-EU version available for CE and VdS compliance. Suitable for steel pipe ranging from 2" to 8" (schedules 10–40), this model detects water movement when a minimum flow of 10 GPM (38 LPM) occurs downstream. Its design includes two SPDT snap-action switches, an instantly recycling pneumatic retard, and a rugged NEMA 4/IP54 enclosure, making it ideal for both indoor and outdoor environments. Built to operate under demanding conditions, the VSR-3.5 supports multiple NFPA applications, functions as a sectional flow detector on larger systems, and incorporates a factory-installed non-corrosive sleeve for added durability.
Key Features
- UL, CUL, CSFM Listed and FM Approved; VSR-EU available for EN12259-5 / VdS requirements
- Vane-type waterflow detector for wet sprinkler systems
- Compatible with 2"–8" steel pipe (Schedules 10–40)
- Flow activation at 10 GPM (38 LPM) or more
- Includes two SPDT (Form C) switches with the following ratings:
- 10 A at 125/250 VAC
- 2 A at 30 VDC (resistive)
- 10 mA minimum at 24 VDC
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