Taco SR502 Two Zone Pump Switching Relay with Priority (Replaces AR861-II)

With the exclusive Taco PowerPort Plug-In Cards, you can easily add such features as post purge, priority protection and pump exercise. Any expandable switching relay can also interface with the Boiler Reset Control and Injection Mixing Add-On Power Controls.
Mix-and-match as needed to customize the system.

Features include:

• External Indicator Lights
  

• Switchable Priority
  
• Simplified Wiring
  
• Fully Enclosed Snap-Out Relays
  
• Compact Design
  
• Fuse Protected
  
• 100% Factory Tested
  
• Isolated End Switch
  
• Contractor Friendly PC Board Layout
  
• Universal Thermostat Compatibility
  
• UL and CSA Approved
  
• 24 Volt Power Input or Output Terminal
  
• Extended 3 Year Warranty
  
• Made in the USA