Taco SR501

Taco SR501 Single-Zone Switching Relay – 120V / 24V Thermostat Control
Reliable, simple, and built for hydronic heating systems, the Taco SR501 Switching Relay is designed to control one circulator pump from a 24V thermostat call. This is a great replacement relay for boiler and radiant heating applications, offering easy installation, clear diagnostics, and dependable performance.
Key Specs & Features
* Brand: Taco
* Model: SR501 Series
* Zones: 1 Zone
* Input Voltage: 120 VAC, single phase
* Transformer: 24 VAC thermostat control
* Load Capacity: 12 Amp combined load
* Motor Rating: 1/3 HP @ 120 VAC
* Compatibility: Works with most conventional and programmable thermostats
* Replacement Use: Replaces many older switching relay brands and models
* Diagnostics: External LED indicator lights for quick troubleshooting
* Relay Type: Standard replaceable “ice cube” relay
* Expandable: Can be connected with other relays for system expansion
https://www.tacocomfort.com/documents/FileLibrary/SingleSwitchRelay_100-89_120820.pdf