Name: Resideo R845A1030/U Switching Relay with Internal Transformer
Brand: Resideo
SKU: HONE-R845A1030/U
Price: 130.00 USD
Availability: InStock

Switching Relay with Internal Transformer

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Frequency	50 Hz; 60 Hz
Electrical Connections	Control Circuit- 2-Wire
Electrical Ratings	Maximum Input-5.0 W
Application	Enclosed intermediate DPST switching relay for 24 volt 2 wire thermostat control of one line voltage and one line or low voltage devices. 120 volt primary power supply.
Includes	Integral transformer, enclosure
Dimensions	5 1/4 in. high x 4 1/4 in. wide x 2 5/16 in. deep
UL	Listed: File No. E4436, Guide No. XAPX
CSA	Certified: File No. LR1620
Temperature Ratings (F)	115 F maximum ambient for 60 Hz. 105 F Max. Ambient for 50 Hz.
Switching	DPST; one pole line voltage, the other line or low voltage
Pilot Duty Ratings	Secondary-- 50 VA @ 24V
Contact Ratings (AFL)	At 120 Vac-- 7.4A; 240 Vac-- 3.7A: Secondary-- at 120 Vac 3A; at 240 Vac 2A
Contact Ratings (ALR)	At 120 Vac-- 44.4A; 240 Vac--22.2A: Secondary-- at 120 Vac 18A; at 240 Vac 12A
Contact Ratings (resistive)	At 120 Vac--10A; 240 Vac-- 6.0A
Input Voltage	120V
Coil Ratings Voltage	24 Vac
Coil Ratings Current	0.4A
Electrical Ratings, Contacts	Maximum connected load is 2000 VA (120 Vac to 240 Vac)

The R845A1030 is a switching relay from Resideo (Honeywell Home).

A relay lets a small control signal switch a much larger load. The thermostat or control board energizes a coil; the coil pulls contacts closed; the contacts carry the current that runs a blower, a circulator or an electric heat element. Nothing on the thermostat side ever sees line voltage.

This relay carries an internal transformer, so it makes its own 24 V control power instead of borrowing it from the system. On a retrofit that is often the deciding feature: adding a relay to a circuit that is already at the limit of its transformer causes exactly the intermittent faults that are hardest to chase.

Match the coil voltage and the contact rating to what you are replacing. A relay with the right coil but an undersized contact will work on the bench and weld shut in service.

Brand: Resideo (Honeywell Home)
Manufacturer Part #: R845A1030/U
Type: Switching relay
Internal transformer: Yes
UPC: 085267990073
Shipping weight: 1.5 lb
Category: Relays

Full Specifications

Application	DPST switching relay for 24 volt 2 wire thermostat control of line voltage devices
Product Features	Integral transformer provides low voltage power for control circuit, Provide intermediate switching of a line voltage device from a low voltage controller
Approvals and Standards	UL Listed: File No. E4436, Guide No. XAPX, CSA Certified: File No. LR1620
Coil Rating Voltage	24 V ac
Coil Connection Type	Control Circuit 2 Wire
Number of Poles	2 Poles
Power Supply Frequency	50 Hz, 60 Hz
Switch Action	DPST
Compatible Thermostat	Low voltage (Class 2) 2-wire Thermostat
Warranty	1 Year
Product Height	5.25 in, 133 mm
Product Length	2.31 in, 59 mm
Product Width	4.25 in, 108 mm