Potter 1116104 VSR-AT-4 Vane Type Waterflow Alarm Switch with Electronic Retard and Auto Test Feature, 4" DN100 Nominal Pipe Size

Ensure dependable sprinkler system monitoring with the Potter Electric Signal, LLC VSR-AT-4 vane type waterflow alarm switch. Engineered for commercial and industrial wet-pipe systems, this water flow control provides fast, accurate detection of sprinkler discharge while minimizing false alarms through an electronic retard feature. The VSR-AT-4 supports a nominal 4" (DN100) pipe size and operates on 24V DC, making it easy to power from most fire alarm panel auxiliary supplies.

Designed for reliability, the unit is UL Listed and FM Approved and incorporates an AutoTest self-test routine plus a failsafe trouble relay to continuously verify paddle and trip-stem integrity. These features deliver peace of mind for facility managers responsible for fire protection, security monitoring, and building surveillance integration. The switch interfaces with addressable and conventional fire panels for seamless alarm signalling and system health reporting.

Specify the VSR-AT-4 where dependable waterflow detection, reduced maintenance, and code compliance are required—contact our sales team to order or request detailed technical data for your next fire protection project.

• Rapid, reliable sprinkler waterflow detection to minimize response time and reduce property risk
• Built-in AutoTest self-checking for consistent, code-compliant fire monitoring without manual inspection
• Electronic retard and failsafe trouble relay to reduce nuisance alarms and ensure dependable system status
• Compatible with standard 4" (DN100) nominal pipe sizes and accepts 24V DC auxiliary power from fire panels
• UL Listed and FM Approved for use on steel pipe schedules, simplifying specification and installation