Taco SR501-5 - 1 Zone Switching Relay w/Fused Outputs

The Taco SR501-5 is a next-generation single-zone switching relay designed to control circulators in hydronic heating systems. Built for fast installs and easy troubleshooting, it features clearly labeled wiring, external diagnostic lights, and a compact enclosure. Ideal for residential and light commercial applications, this relay provides reliable zone control while integrating seamlessly with a wide range of thermostats and boilers.

Features

• Manufacturer: Taco Comfort Solutions
• Part Number: SR501-5
• Application: Single-zone switching relay for hydronic heating systems
• Voltage: 120V power input with 24V thermostat compatibility
• Compatible with conventional, programmable, and WiFi thermostats
• Controls circulators or zone valves in heating systems
• External diagnostic indicator lights for quick system status and troubleshooting
• Built-in priority protection and isolated end switch for boiler activation
• Fuse protected with sealed relay for long-term durability
• Contractor-friendly PC board layout for simplified wiring and installation
• Compact design suitable for residential or light commercial applications
• UL listed for safety and reliability

Applications

• Hot Water Heating Systems
• Closed Cooling Circuits
• Air Conditioning Systems
• Hydronic Heating & Cooling
• Water/Glycol concentrations up to 50%
• Solar / Geothermal

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