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44 63-8702
R8845U Universal Switching Relay
Dimensions in inches (millimeters)
7/32 (6)
DIAMETER
MOUNTING
HOLE
KNOCKOUT
FOR 1/2 (13)
CONDUIT (3)
1-1/16
(27)
1-1/4 (32)
2-3/16
(56)
3-1/2
(89)
3-11/16 (94) 5/16
(8)
5/16 (8)
6-1/4
(159)
5-3/8
(137)
1-3/8 (35)
4-7/16 (118)
2-1/8
(54)
3/16 (5) DIAMETER
3/8 (10) DIAMETER
7/8(22)
DIAMETER
KEYHOLE
TYPE
MOUNTING
HOLE
M17512
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, now
manufactured by Resideo: R182A,B,C,J; R482A,B,C,J; R845;
R882A,B,C,J and RA832.
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.
Electrical Connections: Control Circuit- 2 or 3-wire
Coil Ratings Voltage: 24 Vac
Coil Ratings Current: 0.4A
Electrical Ratings, Contacts: Maximum connected load is 2000 VA
Contact Ratings (AFL): 7.4A AFL, 44.4A @ 120 Vac on each set of line-
voltage contacts
Transformer: Secondary Rating- 24 Vac, 12 VA max., 9 VA available for
external load. Secondary protected by replaceable 1A automotive
fuse.
Operating Humidity Range (% RH): 0 to 90% RH, non-condensing
Temperature Ratings: Ambient: -20°F to +120°F (Ambient: -29°C to
+49°C)
Approximate, Dimensions: 6 1/4 in. high x 4 7/16 in. wide x 3 1/2 in.
deep (159 mm high x 118 mm wide x 89 mm deep)
Approvals, Underwriters Laboratories Inc.: Listed: File No. E4436,
Guide No. XAPX
Approvals, Canadian Underwriters Laboratories Inc.: Listed: Guide No.
XAPX7.
Comments: Thermostat Compatibility – Honeywell (now
manufactured by Resideo) electromechanical and electronic 2- or
3-wire; Thermostat Heat Anticipator Setting – 0.12A
Material Number Input Voltage Frequency Switching Description Includes
R8845U1003/U 120V 60 Hz Two SPST, plus PowerPile
®
rated low
voltage SPST relay. (If normally closed
contacts are needed, use RA889A).
This 120V, 60 Hz Universal Switching Relay with internal
transformer, Provides intermediate switching of line and low
voltage devices from a line or low voltage controller
Integral
transformer,
enclosure
Hydronic Switching Relays