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Taco®
Taco® SR503-EXP-4 SR Expandable Switching Relay, 120VAC, 20 A, DPDT Contact, 120VAC V Coil
Taco®

Taco® SR503-EXP-4 SR Expandable Switching Relay, 120VAC, 20 A, DPDT Contact, 120VAC V Coil

BrandTaco®
MFR Part NoSR503-EXP-4
TSCO Part Number555227

Warranty Length

  • 3 Years

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

Standard Approvals

  • UL and CSA Approved
  • UL Listed