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Expandable Relays have Built-in Priority Protection and also have Contractor Friendly PC Board Layout.
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Taco SR504-EXP-4 Expandable Switching Relay - 4 Zone Taco SR504-EXP-4 Expandable Switching Relay - 4 Zone

  • Taco SR504-EXP-4 Expandable Switching Relay
  • 4 Zone Expandable Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected

Usually Ships in 24 Hours
List Price: $281.00
Our Low Price: 188.95
3 in stock!
(1)
Taco SR506-EXP-4 Expandable Switching Relay - 6 Zone Taco SR506-EXP-4 Expandable Switching Relay - 6 Zone

  • Taco SR506-EXP-4 Expandable Switching Relay
  • 6 Zone Expandable Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected

Usually Ships in 24 Hours
List Price: $398.50
Our Low Price: 217.95
2 in stock!
Taco SR503-EXP-4 Expandable Switching Relay - 3 Zone with Priority Taco SR503-EXP-4 Expandable Switching Relay - 3 Zone with Priority

  • Taco SR503-EXP-4 Expandable Switching Relay
  • 3 Zone Expandable Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected
  • 3 Year Warranty
  • Made in the USA

Usually Ships in 24 Hours
List Price: $260.00
Our Low Price: 158.95
13 in stock!
Taco SR501-EXP-4 Expandable Switching Relay - 1 Zone with Priority Taco SR501-EXP-4 Expandable Switching Relay - 1 Zone with Priority

  • Taco SR501-EXP-4 Expandable Switching Relay
  • Single Zone Expandable Relay
  • Switchable Priority
  • External Indicator Lights
  • Simplified Wiring
  • Contractor Friendly PC Board Layout
  • Universal Thermostat Compatibility
  • Made in USA

Usually Ships in 24 Hours
List Price: $200.00
Our Low Price: 103.95
6 in stock!
Taco SR501-845RP Universal Replacement Relay Taco SR501-845RP Universal Replacement Relay

  • Taco SR501-845RP Universal Replacement Relay
  • Universal Replacement Relay
  • Fast and Economical Field Replacement
  • Snaps into existing Metal Enclosure
  • Replaces Honeywell RA89A, R832A, R845A or comparable relay (see chart)
  • Made in USA
  • 100% Factory Tested
  • UL and CSA Approved

Usually Ships in 24 Hours
List Price: $72.05
Our Low Price: 49.95
3 in stock!