Discontinued
- 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.
Taco® Switching Relay, Expandable, 120 VAC, 20 A, 120 VAC Coil, DPDT, 6-3/4 in H x 10-1/4 in W x 2-3/4 in D
- 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
- 24 V power input or output terminal
- Amperage Rating20 ACoil Voltage120 VACContact FormDPDTVoltage Rating120 VACDimensions6-3/4 in H x 10-1/4 in W x 2-3/4 in DManufacturerTACOManufacturer #SR503-EXP-4TypeExpandable