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Switching Relays
Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system.
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Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset

  • Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset
  • Full outdoor boiler reset control
  • Can control system or zone valve circulator
  • Over-ride of outdoor reset when DHW tank is calling
  • Easy to install and set; will not affect boiler’s warranty
  • Front mounted LED lights for full diagnostic information
  • Ideal for retrofit applications of just about any hot water boiler

Usually Ships in 24 Hours
List Price: $234.50
Our Low Price: 159.95
2 in stock!
Taco SR501-4 Switching Relay - 1 Zone Taco SR501-4 Switching Relay - 1 Zone

  • Taco SR501-4 Switching Relay
  • 1 Zone Relay
  • Universal Replaceability
  • Snap-in PC Board
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • External Indicator Lights
  • Fuse Protected (with spare)

Usually Ships in 24 Hours
List Price: $89.10
Our Low Price: 51.95
3 in stock!
Taco SR501-HC-4 Switching Relay High Capacity - 1 Zone Taco SR501-HC-4 Switching Relay High Capacity - 1 Zone

  • Taco SR501-HC-4 Switching Relay High Capacity
  • 1 or 2 Zones
  • High Capacity
  • Snap-in PC Board
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • External Indicator Lights
  • Fuse Protected (with spare)

Usually Ships in 24 Hours
List Price: $129.50
Our Low Price: 89.95
2 in stock!
Taco SR502-4 Switching Relay - 2 Zone Taco SR502-4 Switching Relay - 2 Zone

  • Taco SR502-4 Switching Relay
  • 2 Zone 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: $211.00
Our Low Price: 114.95
4 in stock!
Taco SR503-4 Switching Relay - 3 Zone Taco SR503-4 Switching Relay - 3 Zone

  • Taco SR503-4 Switching Relay
  • 3 Zone 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: $228.50
Our Low Price: 124.95
3 in stock!
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 SR504-4 Switching Relay - 4 Zone Taco SR504-4 Switching Relay - 4 Zone

  • Taco SR504-4 Switching Relay
  • 4 Zone 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: $254.50
Our Low Price: 154.95
3 in stock!
(1)
Taco SR506-4 Switching Relay - 6 Zone with Priority Taco SR506-4 Switching Relay - 6 Zone with Priority

  • Taco SR506-4 Switching Relay 6 Zone Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected
  • 100% Factory Tested
  • Isolated End Switch
  • 3 Year Warranty
  • Made in the USA

Usually Ships in 24 Hours
List Price: $374.00
Our Low Price: 202.95
3 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!
Taco PC610-1 Universal Timer and Pump Exercise Plug-In Card Taco PC610-1 Universal Timer and Pump Exercise Plug-In Card

Taco PC610-1 Universal Timer and Pump Exercise Plug-In Card
Designed to cycle pumps at selected time intervals
Use with any Taco Expandable Relay (-EXP models)
Simply Plug Into Any One of Three Slots
Solid-State Electronic Card
No Wiring Required
LED Lights
Fixed and Adjustable Time Delays
Optimizes Any System
100% Factory Tested

Usually Ships in 24 Hours
List Price: $82.00
Our Low Price: 44.95
2 in stock!
Taco PC700-2 Boiler Reset Control Taco PC700-2 Boiler Reset Control

  • Taco PC700-2 Boiler Reset Control
  • Regulates the supply water temperature of a single boiler based on the outdoor temperature
  • Use with any Taco Expandable Relay (-EXP models)
  • Microprocessor-Based Control
  • Simplifies Wiring
  • Easily Plugs Into Interface Slot
  • Full Diagnostic Capabilities
  • Speeds Installation
  • Saves Energy
  • Increases Comfort Level
  • 100% Factory Tested

Usually Ships in 24 Hours
List Price: $371.50
Our Low Price: 257.95
2 in stock!
Taco PC702-1 Two Stage Boiler Reset Control Taco PC702-1 Two Stage Boiler Reset Control

  • Taco PC702-1 Two Stage Boiler Reset Control
  • Regulates the supply water temperature from a two-stage boiler system based on the outdoor temperature
  • Use with any Taco Expandable Relay (-EXP models)
  • Microprocessor-Based Control
  • Simplifies Wiring
  • Easily Plugs Into Interface Slot
  • Full Diagnostic Capabilities
  • Speeds Installation
  • Saves Energy
  • Increases Comfort Level
  • 100% Factory Tested

Usually Ships in 24 Hours
List Price: $456.50
Our Low Price: 279.75
1 in stock!
Taco PC705-2 Variable Speed Pump Mixing Control Taco PC705-2 Variable Speed Pump Mixing Control

  • Taco PC705-2 Variable Speed Pump Mixing Control
  • Regulates the supply water temperature to a heating system
  • Use with any Taco Expandable Relay (-EXP models)
  • Microprocessor-Based Control
  • Simplifies Wiring
  • Easily Plugs Into Interface Slot
  • Full Diagnostic Capabilities
  • Speeds Installation
  • Saves Energy
  • Increases Comfort Level
  • 100% Factory Tested

Usually Ships in 24 Hours
List Price: $493.50
Our Low Price: 299.75
2 in stock!
Taco SR024-001RP Replacement Relay - 24 Volt Taco SR024-001RP Replacement Relay - 24 Volt

  • Taco SR024-001RP Replacement Relay
  • 24 Volt
  • Replacement Relay

Usually Ships in 3 to 5 Business Days
List Price: $31.96
Our Low Price: 24.25
18 in stock!
Taco SR120-001RP Replacement Relay - 120 Volt Taco SR120-001RP Replacement Relay - 120 Volt

  • Taco SR120-001RP Replacement Relay
  • 120 Volt
  • Replacement Relay

Usually Ships in 24 Hours
List Price: $31.00
Our Low Price: 23.95
13 in stock!