Potter VSR-3 1/2 VSR Series Vane Type Waterflow Alarm Switch with Retard, 3-1/2" Nominal Pipe Size

Designed to deliver dependable sprinkler monitoring, the Potter Electric Signal, LLC VSR Series vane waterflow switch provides early, accurate detection of flow events to protect facilities and reduce downtime. The VSR-3 1/2 is engineered for use in wet sprinkler systems and fits a 3-1/2 in nominal pipe application, triggering at typical flows of 4–10 GPM (with actuation commonly at 10 GPM) and including an adjustable, instantly-recycling pneumatic retard to prevent nuisance alarms. Housed in a rugged die-cast enclosure with tamper-resistant fasteners and optional cover-tamper supervision, this waterflow switch supports secure installations and long-term reliability. Dual SPDT switches permit multi-circuit signaling to fire panels, remote monitoring stations, or building management systems—making it ideal for security-conscious environments that require integration with fire and surveillance infrastructure. UL Listed and FM Approved, the VSR-3 1/2 simplifies compliance while delivering proven performance in fire suppression and life-safety applications. Add the Potter VSR-3 1/2 to your water flow controls lineup for robust fire system monitoring—contact us to specify or order for your next installation.

• Fast, reliable sprinkler flow detection that reduces response time and improves fire protection across commercial systems
• Adjustable pneumatic retard minimizes false alarms from transient pressure changes for dependable monitoring
• Durable die-cast enclosure with tamper-resistant screws enhances physical security and long-term field reliability
• Dual SPDT switches allow simultaneous circuits or remote supervision for flexible integration with alarm and monitoring systems
• UL, FM and LPC-approved design helps meet code and insurance requirements for sprinkler system installations