- Refrigeration Equipment
- AC and Heating Equipment
- Indoor Air Quality
- Food Service
- Compressors
- Motors and Accessories
- Refrigerants and Chemicals
-
Controls and Electrical
- Thermostat
- Commercial Building
- Defrost Termination-Freeze Protection-Fan Switches
- Detector
- Electrical Devices and Accessories
- Flow Switch-Current Sensors
- Heating
- Humidity
- Motor Drives
- Pneumatic
- Pressure
- Supermarket Controls and Parts
- Temperature
- Timer
- Water Regulating Valve
- Zone Control and Wireless
-
Float Switch
-
Security Camera
- Parts and Components
- Supplies and Service
- Retired and Closeouts
- New and Featured
- Job List Builder
Product Categories
-
Product Categories
- Refrigeration Equipment
- AC and Heating Equipment
- Indoor Air Quality
- Food Service
- Compressors
- Motors and Accessories
- Refrigerants and Chemicals
- Adhesives-Threadlock View
- Coil Cleaner View
- Coil Coating View
- Coil Degreaser View
- Degreaser View
- Electric Contact Cleaner View
- Food Grade Silicone View
- Glycols View
- Leak Detection View
- Leak Sealant View
- Lubricants View
- Pump Protector View
- Refrigerant Treatments View
- Solvent View
- Wasp and Hornet Spray View
- Zinc Spray View
- Controls and Electrical
- Thermostat
- Commercial Building
- Defrost Termination-Freeze Protection-Fan Switches
- Detector
- Electrical Devices and Accessories
- Flow Switch-Current Sensors
- Heating
- Humidity
- Motor Drives
- Pneumatic
- Pressure
- Supermarket Controls and Parts
- Temperature
- Timer
- Water Regulating Valve
- Zone Control and Wireless
- Float Switch
- Security Camera
- Parts and Components
- Supplies and Service
- Retired and Closeouts
- New and Featured
- Job List Builder
-
New & Featured
Shopping Made Easy
Tools for Every Job
Contractor Spotlight
Tools
Subscriptions
Credit Account
- All Brands
- Copeland
- Sporlan
- Heatcraft
- Arcoaire
- Bohn
- IRP
- National Refrigerants
- NRP
- Sea Breeze
Catalog pricing shown. Please Sign In to see your pricing.
- Vendor Name:
- Taco
- URI Part Number:
- SR503
- Vendor Part Number:
- SR503-4
- Shipping Weight (Lbs.):
- 5
- Contact Rating (Amps):
- 15 Amp
- Number of Zones:
- 3 with Priority
- Voltage:
- 120 VAC
Taco switching relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. All switching relays are UL and CSA listed, use standard ice cube replaceable relays and are compatible with conventional and programmable thermostats.
Features:
- External Indicator Lights
- Switchable Priority
- Simplified Wiring
- Fully Enclosed Snap-Out Relays
- Fuse Protected
- Isolated End Switch
- Contractor Friendly PC Board Layout
- Universal Thermostat Compatibility
- 24 Volt Power Input or Output Terminal
- Extended 3 Year Warranty
Additional -EXP Features:
- Plug-in PowerPort Card Slots
- Add-on Power Control Plug
- Expandable to 20 Zones
- Interface with -EXP Zone Valve Controls
Related Items
Related Categories
Related Products
Set Quantity & Add to Cart
