Potter Electric Signal Co. Us VSR-4 Waterflow Switch

Product Description

The POTTER ELECTRIC SIGNAL CO. US VSR-4 is a vane-type waterflow switch designed for use in wet-pipe fire sprinkler systems. When water movement occurs in the pipe, the internal paddle deflects and triggers the switch contacts, sending a flow signal to a fire alarm control panel or local alarm device. The VSR-4 is sized for 4-inch pipe and is a staple component in commercial and residential sprinkler system installations. Licensed fire alarm and sprinkler contractors rely on this type of device to meet code-required flow detection requirements.

The VSR-4 is suited for wet-pipe fire sprinkler systems installed in commercial buildings, warehouses, multi-family residential structures, and institutional facilities. It is mounted directly to a 4-inch sprinkler main or branch line. Installation is typically performed by licensed fire protection contractors during new construction or system retrofit projects. Where local codes require flow detection at each sprinkler zone, this device provides the necessary initiating signal.

Key Features

• Vane-type paddle actuator detects waterflow in 4-inch pipe
• Initiates alarm or supervisory signal upon flow detection
• Designed for wet-pipe fire sprinkler system applications
• Compact form factor for straightforward saddle or tee installation
• Sold individually as a single unit

Compatibility

Designed as an OEM-style waterflow detection device for wet-pipe fire sprinkler systems using 4-inch pipe.

Installation Notes

Installation must be performed by a licensed fire protection or fire alarm contractor in accordance with NFPA 13 and NFPA 72 requirements. Before installation, shut down and depressurize the sprinkler system section where the switch will be mounted. Verify the paddle length is appropriate for the pipe schedule and internal diameter to ensure proper actuation. Follow the manufacturer wiring instructions and confirm switch operation with a flow test after installation.