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TACO SR503-EXP-4 3 ZONE EXPANDABLE SWITCHING RELAY WITH PRIORITY
Product Details
Attributes
Features
Resources
Taco®, SR503-EXP-4, Switching Relay, Expandable, Series: SR, 120 VAC, 20 A, 1/3 hp Power, 60 Hz Frequency, 120 VAC Coil, DPDT Contact Form, Screw Hole Mounting, 240 deg F, 6-3/4 in H x 10-1/4 in W x 2-3/4 in D Dimensions, Domestic
Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the -EXP controls, the job is made easy. 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. For larger jobs, switching relays can be expanded up to 20 zones with priority. 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.
- External indicator lights
- Fully enclosed snap-out relays
- 24 V power input or output terminal
- Front Diagnostic Lights
- Switchable Priority
- Simplified Wiring
- Built-in Priority Protection
- Compact Design
- Fuse Protected
- 100% Factory Tested
- Isolated End Switch
- Contractor Friendly PC Board Layout
- Universal Thermostat Compatibility
- 24 Volt Power Output for hard wired thermostats
- Field Replaceable Transformer
- Add-on Power Control Plug
- Built-in, Post Purge and Pump Exercise Functions
- Switchable Primary Circulator Output
- Two boiler contacts, utilizes full functionality of Mod-Con boilers
- Interface with -EXP Zone Valve Controls
Product Details
Taco®, SR503-EXP-4, Switching Relay, Expandable, Series: SR, 120 VAC, 20 A, 1/3 hp Power, 60 Hz Frequency, 120 VAC Coil, DPDT Contact Form, Screw Hole Mounting, 240 deg F, 6-3/4 in H x 10-1/4 in W x 2-3/4 in D Dimensions, Domestic
Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the -EXP controls, the job is made easy. 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. For larger jobs, switching relays can be expanded up to 20 zones with priority. 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.
Attributes
Features
- External indicator lights
- Fully enclosed snap-out relays
- 24 V power input or output terminal
- Front Diagnostic Lights
- Switchable Priority
- Simplified Wiring
- Built-in Priority Protection
- Compact Design
- Fuse Protected
- 100% Factory Tested
- Isolated End Switch
- Contractor Friendly PC Board Layout
- Universal Thermostat Compatibility
- 24 Volt Power Output for hard wired thermostats
- Field Replaceable Transformer
- Add-on Power Control Plug
- Built-in, Post Purge and Pump Exercise Functions
- Switchable Primary Circulator Output
- Two boiler contacts, utilizes full functionality of Mod-Con boilers
- Interface with -EXP Zone Valve Controls