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Honeywell R8845U1003 Universal Switching Relay w/ Internal Transformer

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Price: $85.63
Item Number: R8845U1003
Manufacturer Name: Honeywell
Manufacturer Part No: R8845U1003
Honeywell R8845U1003 Universal Switching Relay with Internal Transformer
Honeywell R8845U1003 Universal Switching Relay with Internal TransformerHoneywell R8845U1003 Universal Switching Relay with Internal Transformer


The R8845U Universal Switching Relay with 24 V transformer provides 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.

Product Specifications

  • Application: Enclosed Universal switching relay with internal transformer for 24 volt 2 or 3 wire thermostat control of line voltage devices. Two line voltage SPST relays and one low voltage SPST relay with PowerPile® rating.
  • Dimensions (in.): 6 1/4 in. high x 4 7/16 in. wide x 3 1/2 in. deep
  • Dimensions (mm): 159 mm high x 118 mm wide x 89 mm deep
  • Includes: Integral transformer, enclosure
  • Comments: Thermostat Compatibility-- Honeywell electromechanical and electronic 2- or 3-wire; Thermostat Heat Anticipator Setting-- 0.12A
  • Frequency: 60 Hz
  • Approvals, Underwriters Laboratories Inc.: Listed: File No. E4436, Guide No. XAPX
  • Electrical Connections: Control Circuit- 2 or 3-wire
  • Operating Humidity Range (% RH): 0 to 90% RH, non-condensing
  • Temperature Ratings (C): Ambient: -29 C to +49 C
  • Temperature Ratings (F): Ambient: -20 F to +120 F
  • Approvals, Canadian Underwriters Laboratories Inc.: Listed: Guide No. XAPX7.
  • Switching: Two SPST, plus PowerPile® rated low voltage SPST relay. (If normally closed contacts are needed, use RA889A).
  • Contact Ratings (AFL): 7.4A AFL, 44.4A @ 120 Vac on each set of line-voltage contacts
  • Input Voltage: 120V
  • Coil Ratings Voltage24 Vac
  • Coil Ratings Current: 0.4A
  • Electrical Ratings, Contacts: Maximum connected load is 2000 VA
  • Transformer: Secondary Rating-24 Vac, 12 VA max., 9 VA available for external load. Secondary protected by replaceable 1A automotive fuse.

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