Potter VSR-AT 4 Vane Type Waterflow Alarm Switch with Electronic Retard and Auto Test Feature, 4" Pipe Size

Deliver dependable sprinkler monitoring and simplified maintenance with the Potter Electric Signal VSR-AT 4 vane-type waterflow alarm switch. Designed for wet sprinkler systems, this waterflow control offers a remote test capability so technicians can verify operation without flowing water, reducing service interruptions and speeding inspections. The VSR-AT includes an adjustable 0–90 second electronic retard to minimize false alarms, plus two SPST contacts for straightforward integration into building security, fire alarm, and surveillance monitoring systems. UL Listed and FM Approved for use on steel pipe (schedules 10–40) and sized for 4" pipe, it meets commercial code requirements while providing weatherproof protection for long-term reliability. Clear terminal identification and rugged construction streamline installation and maintenance in commercial and industrial applications. Ideal for fire protection contractors, facilities managers, and integrators looking for reliable water flow detection and alarm signaling. Add the VSR-AT 4 to your fire protection design to improve system testing, reduce downtime, and enhance overall monitoring—contact sales or add to cart to specify for your next project.

• Enables remote testing without flowing water to simplify maintenance and reduce system downtime
• Adjustable 0–90 second electronic retard for nuisance alarm prevention and flexible response tuning
• UL Listed and FM Approved for dependable code-compliant performance on wet sprinkler systems
• Weatherproof, robust construction and easy-to-read terminal design make field installation and servicing faster
• Two SPST contacts provide reliable alarm and supervisory signaling for integrated monitoring and security systems