| 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) |
Description
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