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Taco Switching Relay SR503-EXP-1 combines clearly-labeled PC board layouts with advanced features
that allow you to completely customize your system. External indicator lights give you instant diagnostic feedback,
making service calls or new installation start-ups a snap. The Taco SR503-EXP-1 switching relay is
UL 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.
Taco Switching Relay SR503-EXP-1 Features:
- Zones - 3 with Priority
(Priority capability for domestic hot water)
- Add-on Power Control Plug - 1
- Plug-in PowerPort Card Slots - 3
- Allows Circulator and Boiler to be switched on at the same time
- Double Pole - Single Throw (DPST)
- Connects directly to thermostat
- Switches - 110 volts or 24 volts
- LED Status Lights
- Maximum Combined Load - 15 amps
- UL and CSA approved
- Extended 3 year warranty
- Made in the USA
- Transformer Voltage - 120 volts
- Size - 10 1/4" w by 6 3/4" h by 2 3/4" d
Optional Cards Available:
- Post Purge Timer - PC600-2
- Priority Protection - PC605-2
- Universial Timer - PC610-1
Optional Add-on Power Control Plug:
- Boiler Reset Control - PC700
- Two Stage Boiler Reset Control - PC702
- Variable Speed Pump Injection Mixing Control - PC705
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