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

Protect your facility with fast, reliable waterflow detection — the Potter Electric Signal, LLC VSR-3 vane type waterflow switch is engineered for dependable sprinkler system monitoring in commercial and industrial buildings. Designed for wet sprinkler systems, the VSR-3 senses flows as low as the UL sensitivity range (4–10 GPM) and features an adjustable, instantly recycling pneumatic retard to prevent false alarms from transient pressure spikes. Two SPDT (form C) switches provide separate alarm and supervisory outputs or support dissimilar voltages, simplifying integration with fire panels and building security/monitoring systems. The rugged die-cast enclosure, tamper‑resistant cover screws and field-installable cover tamper switch add physical security and reduce unauthorized access — ideal for critical infrastructure, security, and surveillance-focused installations. UL Listed and FM Approved for steel pipe (3" nominal pipe size and applicable schedules), the VSR-3 is also suitable as a sectional detector on large systems. Specify the Potter VSR-3 for code-compliant, low-maintenance waterflow alarm performance — contact us to add it to your next fire protection or building monitoring project.

• Delivers dependable sprinkler monitoring that detects water flow quickly to protect people and property
• Adjustable pneumatic retard minimizes nuisance alarms while ensuring confirmed flow signals for compliant fire protection
• Dual SPDT contacts allow simultaneous alarm and supervisory connections or dissimilar voltage circuits for flexible system integration
• Robust die-cast housing with tamper‑resistant cover improves physical security and simplifies maintenance in commercial installations
• UL Listed and FM Approved for use on steel pipe (3" nominal size compatible), ensuring code compliance and reliable performance