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Universal Switching Relay, SPST
Brand: Honeywell
Part#: R8845U1003
Honeywell R8845U1003 is a universal switching relay with internal transformer. This switching relay provides intermediate switching of line voltage and low voltage devices from a line voltage or low voltage controller. It is typically applied in Hydronic heating systems.
Honeywell Universal Switching Relays R8845U with 24 V transformer provide intermediate switching of line-and low-voltage devices from a line- or low-voltage controller and is typically applied in Hydronic heating systems.

  • Replaceable socketed relays
  • Two troubleshooting LED
  • Push-to-test button
  • Replaceable transformer fuse
  • Low-voltage contact rating for Powerpile applications
  • Long-life DC relay drive control technology
  • Relay for use with external 24 Vac or 24 Vdc supply, with line-voltage control, or with internal 24 V transformer supply
  • One model replaces many competitor models
  • One model may replace many Honeywell models:R182A,B,C,J
  • R482A,B,C,J
  • R845
  • R882A,B,C,J and RA832
  • Includes integral transformer, enclosure
  • Approvals of Canadian Underwriters Laboratories and Underwriters Laboratories Inc.

Technical Specifications:
  • Switching Action: Two SPST, plus PowerPile® rated low voltage SPST relay. (If normally closed contacts are needed, use RA889A)
  • Coil Ratings Current: 0.4A
  • Coil Ratings Voltage: 24 Vac
  • Thermostat Heat Anticipator Setting: 0.12A
  • Transformer Primary Rating: 120V, 60 Hz
  • Transformer Secondary Rating: 24V, 12 VA max., 9 VA available for external load. Secondary protected by replaceable 1A automotive fuse
  • Temperature Range: (Ambient) -20 F to +120 F
  • Thermostat Compatibility: Honeywell electromechanical and electronic 2- or 3-wire
  • Dimensions: 6-1/4" high x 4-7/16" wide x 3-1/2" deep
  • Electrical Connections (Control Circuit): 2 or 3-wire
  • Electrical Ratings (Primary Voltage): 120V, 60 Hz
  • Contacts Electrical Ratings (120 Vac AFL): 7.4A AFL, 44.4A ALR on each set of line-voltage contacts. Maximum connected load is 2000 VA
  • Replacement Parts: 32002190-001 Circulator Replacement Relay
  • Operating Humidity Range (% RH): 0 to 90% RH, non-condensing
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